JP2003087240A - Ciphering device, deciphering device, ciphering/ deciphering device, and program recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress increase of a circuit scale in ciphered transmission using a plurality of channels. SOLUTION: A transmission packet multiplex means 12 performs the time- division multiplexing of packets of respective isochronous channels. The multiplexing is performed in each clock, in each ciphering block of a ciphering means 16, in each packet, or in each isochronous packet. The ciphering means 16 ciphers the time-division multiplexed packet by using a time-division multiplexed ciphering key. Each of isochronous packet generation means 18, 19 adds a necessary header. A transmitting means 111 sends a generated packet to an IEEE1394.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital video recorder, STB (Set Top Box), personal computer, etc., which is an encryption device and a decryption device which are used in order to conceal data transmission / reception to a third party and perform it safely. And an encryption / decryption device and a program recording medium.

[0002]

2. Description of the Related Art Conventionally, as an encryption device and a decryption device,
The thing described in Unexamined-Japanese-Patent No. 10-224402 is known.

FIG. 17 shows a first encryption device and a decryption device.
A conventional example of is shown. In FIG. 17, 1701 is an encryption device, 1702 is a decryption device, 1703 is an encryption means, and 1
Reference numeral 704 is an encryption key, 48 is an isochronous packet generation means, 110 is an asynchronous packet generation means, and 49.
Is a transmission means, 1705 is a decryption means, 1706 is a decryption key, 411 is an isochronous packet separation means, 115
Is an asynchronous packet separating means, and 410 is a receiving means.

In FIG. 17, the encryption device 1701 and the decryption device 1702 are referred to as "IEEE1394 Std 1394-1995, Standard for a", which is a standard suitable for transferring multimedia data.
High Performance Serial Bus ”(hereinafter simply referred to as IEEE
(Referred to as 1394).

A conventional encryption device 1701 and decryption device 1702 will be described below with reference to FIG.

In IEEE 1394, one isochronous cycle = 125 μs in order to secure a constant transmission rate.
There are two types of time-division multiplexing: a method of transmitting a packet in synchronization with the following (hereinafter referred to as isochronous transmission) and a method of transmitting a packet asynchronously (hereinafter referred to as asynchronous transmission).

FIG. 18 (a) shows a state of data transmission in IEEE1394.

In FIG. 18A, isochronous transmission is performed for each packet in one isochronous cycle (hereinafter, this packet is referred to as an isochronous packet),
This is an example in which a packet is asynchronously transmitted asynchronously (hereinafter, this packet is referred to as an asynchronous packet). In IEEE 1394, an isochronous packet is preferentially transmitted within one isochronous cycle, and if there is an asynchronous packet thereafter, it is transmitted.

On the other hand, MPEG2 (Moving Picture code
Digital broadcasting using g Experts Group 2) is becoming widespread, and along with this, a mechanism for restricting the duplication of high-quality digital data, for example, dubbing of recorded programs or copying of data, is part of digital video. It is commercialized by the recorder. This is to protect data from being encrypted by encrypting the data from a third party and to prevent illegal copying. FIG. 17 shows an example in which a mechanism for preventing illegal copying is introduced in IEEE1394.

The encryption means 1703 uses the encryption key 1704 to encrypt the isochronous packet. The isochronous packet generation means 48 adds a header in which information necessary for transmission is written to the encrypted isochronous packet. When asynchronous transmission is required, a header in which information required for transmission is written is added by the asynchronous packet generation means 110. Transmission means 49
Transmits the isochronous packet and the asynchronous packet on the IEEE1394 bus in a time-division multiplexed manner.

The transmitting means 49 is generally composed of a physical layer and a link layer. The physical layer sends data to the IEEE 1394 bus and arbitrates the bus. The link layer serves as an interface between the isochronous packet generation means 48 and the asynchronous packet generation means 110 and the physical layer.

The isochronous packet is encrypted by the encryption means 1703. Therefore, IEEE139
The isochronous packet on the 4 bus has an encryption key 170
It cannot be used by a third party who does not know 4. That is, the isochronous packet is protected against unauthorized use.

On the other hand, the receiving means 410 is the IEEE 1394.
Receive packets on the bus. The receiving unit 410 is generally composed of a physical layer and a link layer. The physical layer is IEEE
It takes in data from the E1394 bus and arbitrates the bus. The link layer includes an isochronous packet separating means 411 and an asynchronous packet separating means 115,
It interfaces with the physical layer.

Isochronous packet separating means 411
Separates only the isochronous packet from the time-division multiplexed packet, and the asynchronous packet separating means 115 separates only the asynchronous packet.
The decryption unit 1705 decrypts the received isochronous packet with the decryption key 1706. Here, if the encryption key 1704 and the decryption key 1706 are the same, the decryption means 1705 correctly decrypts the original data. The decryption key 1706 is transmitted from the encryption device 1701 by the decryption device 1701 by, for example, asynchronous transmission.
It will be sent separately to 2.

As described above, in the first conventional example, when the isochronous transmission is used, the encryption means 1703 can protect the data from unauthorized use by a third party. However, when transmission is performed using asynchronous transmission, data cannot be protected from unauthorized use by a third party.

FIG. 19 shows a second encryption / decryption device.
A conventional example of is shown. In FIG. 19, 1901 is an encryption device, 1902 is a decryption device, 1903 is a first encryption means, 1904 is an nth encryption means, 13 is a first encryption key, and 14 is an nth encryption. A key, 18 is a first isochronous packet generation means, 19 is an nth isochronous packet generation means, 1905 is a first decryption means, 1906.
Is the n-th decryption means, 117 is the first decryption key, 118
Is an nth decryption key, 113 is a first isochronous packet separating means, and 114 is an nth isochronous packet separating means. The same numbers are given to those that operate in the same manner as in FIG.

In isochronous transmission, up to 63 channels of isochronous packets can be time-division multiplexed and transmitted. FIG. 18B shows a state of n-channel (n is 2 or more and 63 or less) isochronous transmission. Similar to FIG. 18A, n-channel isochronous transmission is performed prior to asynchronous transmission. This enables transmission of a plurality of MPEG2 data and MPEG.
It becomes possible to perform transmission in which two data and audio data are mixed.

FIG. 19 shows an encryption device 1901 and a decryption device 190 compatible with n-channel isochronous transmission.
2 is shown. The n encryption means from the first encryption means 1903 to the nth encryption means 1904 use the n encryption keys from the first encryption key 13 to the nth encryption key 14. Then, each of the n-channel isochronous packets is encrypted. Headers are added to the encrypted packets by the n isochronous packet generation means from the first isochronous packet generation means 18 to the nth isochronous packet generation means 19, and the transmission means 49 performs time division multiplexing with the asynchronous packets. , IEEE1
It is sent out on the 394 bus.

The transmitting means 49 is generally composed of a physical layer and a link layer. The physical layer sends data to the IEEE 1394 bus and arbitrates the bus. Link layer is first
The interface between the isochronous packet generating means 18, the nth isochronous packet generating means 19, the asynchronous packet generating means 110, and the physical layer is performed.

The n-channel isochronous packet received by the receiving means 410 is separated for each channel by n isochronous packet separating means from the first isochronous packet separating means 113 to the nth isochronous packet separating means 114. . The n decryption means from the first decryption means 1905 to the nth decryption means 1906 use the n decryption keys from the first decryption key 117 to the nth decryption key 118. Then, each of the n-channel isochronous packets is decoded.

Prior to this, the receiving means 410 is the IEEE
Receives packets on the E1394 bus. Receiving means 41
0 is generally composed of a physical layer and a link layer. The physical layer takes in data from the IEEE 1394 bus,
Bus arbitration, etc. The link layer serves as an interface between the first isochronous packet separating means 113, the nth isochronous packet separating means 114 and the asynchronous packet separating means 115, and the physical layer.

As described above, in the second conventional example, in order to conceal the n-channel isochronous packet from the third party, n encryption means and n decryption means are required.

[0023]

However, the above-described conventional configuration has a problem that asynchronous transmission cannot be performed while being concealed from a third party. Further, when isochronous transmission is performed by two or more channels, two or more encryption means and decryption means are required, which causes a problem that the circuit scale increases.

The present invention solves the above-mentioned conventional problems. By encrypting asynchronous transmission, it can be concealed from a third party, and a circuit can be used for isochronous transmission of two or more channels. An object of the present invention is to provide an encryption device, a decryption device, an encryption / decryption device, and a program recording medium that can be reduced in scale.

[0025]

In order to solve this problem, the invention described in claim 1 is an encryption device for a transmission system for synchronously transmitting a plurality of data using a plurality of channels. Then, as illustrated in FIG. 1, transmission data multiplexing means for multiplexing all or at least two of the plurality of data and outputting the multiplexed data,
It comprises an encryption means for encrypting the multiplexed data and outputting the encrypted data, and a transmission means for transmitting the encrypted data to all or at least two channels of the plurality of channels. There is.

Therefore, according to the first aspect of the present invention, the transmission data multiplexing means multiplexes all or at least two of the plurality of data and outputs the multiplexed data. The encryption means encrypts the multiplexed data and outputs the encrypted data. The transmitting means transmits the encrypted data to all of the plurality of channels or at least two channels.

The invention according to claim 6 is a decoding device for a transmission system for synchronously transmitting a plurality of data by using a plurality of channels, wherein the plurality of the plurality of data are transmitted as shown in FIG. Receiving means for receiving the received channel and outputting the received data; receiving data multiplexing means for multiplexing all or at least two data of the received data and outputting multiplexed data; It comprises decoding means for decoding and outputting the decoded data, and demultiplexing means for demultiplexing the decoded data and outputting all or at least two of the plurality of data.

Therefore, according to the invention described in claim 6, the receiving means receives the plurality of channels and outputs the received data. The reception data multiplexing means multiplexes all the received data or at least two data and outputs the multiplexed data. The decoding means decodes the multiplexed data and outputs the decoded data. The demultiplexing means demultiplexes the decoded data and outputs all of the plurality of data or at least two data.

Further, the invention according to claim 11 is an encryption / decryption device for a transmission system for synchronously transmitting a plurality of data using a plurality of channels, and as shown in FIG. All or at least 2 of the transmitted data of
Transmission data multiplexing means for multiplexing one transmission data and outputting the multiplexed transmission data; and encryption and decoding the multiplexed transmission data, outputting encrypted data, and decrypting and decoding the multiplexed reception data Encryption / decryption means for outputting encrypted data, and transmission / reception means for transmitting the encrypted data to all or at least two channels of the plurality of channels and receiving the plurality of channels and outputting the received data A reception data multiplexing means for multiplexing all or at least two pieces of the received data and outputting multiplexed reception data; and all or at least a plurality of reception data for demultiplexing the decoded data. It is composed of demultiplexing means for outputting two received data.

Therefore, according to the invention described in claim 11, the transmission data multiplexing means multiplexes all of the plurality of transmission data or at least two transmission data,
Output multiplexed transmission data. The encryption / decryption means encrypts the multiplexed transmission data, outputs the encrypted data, decrypts the multiplexed reception data, and outputs the decrypted data. The transmitting / receiving means transmits the encrypted data to all of the plurality of channels or at least two channels, receives the plurality of channels, and outputs the received data. The reception data multiplexing means multiplexes all the received data or at least two data and outputs the multiplexed reception data. The demultiplexing means demultiplexes the decoded data and outputs all of the plurality of received data or at least two received data.

The sixteenth aspect of the present invention is an encryption device for a transmission system having a channel for performing synchronous transmission and a channel for performing asynchronous transmission, as exemplified in FIG. Transmitting data multiplexing means for multiplexing data transmitted synchronously and data transmitted asynchronously and outputting multiplexed data; and encrypting the multiplexed data and outputting encrypted data And an transmitting means for transmitting the encrypted data to the channel for performing the synchronous transmission and the channel for performing the asynchronous transmission.

Therefore, according to the sixteenth aspect of the present invention, the transmission data multiplexing means multiplexes the data transmitted synchronously and the data transmitted asynchronously, and outputs the multiplexed data. . The encryption means encrypts the multiplexed data and outputs the encrypted data. The transmitting means transmits the encrypted data to a channel for synchronous transmission and a channel for asynchronous transmission.

The invention as set forth in claim 25 is a decoding apparatus for a transmission system having a channel for performing synchronous transmission and a channel for performing asynchronous transmission, as exemplified in FIG. Receiving means for receiving the channel for performing the synchronous transmission and outputting the data transmitted for the synchronous and for receiving the channel for performing the asynchronous transmission and outputting the data for the asynchronous transmission; Reception data multiplexing means for multiplexing the transmitted data and the asynchronously transmitted data and outputting the multiplexed data, and decoding the multiplexed data and outputting the decoded data Decoding means and a multiprocessor for outputting the decoded synchronously transmitted data and the decoded asynchronously transmitted data by demultiplexing the decoded data. It is composed of a separating means.

Therefore, according to the twenty-fifth aspect of the invention, the receiving means receives the channel for performing the synchronous transmission, outputs the data transmitted synchronously, and performs the asynchronous transmission. Is received and the data transmitted asynchronously is output. The reception data multiplexing means multiplexes the data transmitted synchronously and the data transmitted asynchronously, and outputs the multiplexed data. The decoding means decodes the multiplexed data and outputs the decoded data. The demultiplexing means demultiplexes the decoded data and outputs the decoded synchronously transmitted data and the decoded asynchronously transmitted data.

The thirty-fourth aspect of the present invention is an encryption device for a transmission system having a channel for performing synchronous transmission and a channel for performing asynchronous transmission, as exemplified in FIG. A first encryption means for encrypting data transmitted synchronously with an encryption key and outputting the encrypted data; and a first encryption means encrypting data transmitted asynchronously with the encryption key Second encryption means for outputting the encrypted data encrypted by an encryption algorithm different from the means, and transmitting the data encrypted by the first encryption means to the channel for synchronous transmission And transmitting means for transmitting the data encrypted by the second encryption means to the channel for performing the asynchronous transmission.

Therefore, according to the thirty-fourth aspect of the present invention, the first encryption means encrypts the data transmitted synchronously with the encryption key, and outputs the encrypted data. The second encryption means encrypts the asynchronously transmitted data with an encryption key using an encryption algorithm different from that of the first encryption means, and outputs the encrypted data. The transmitting means transmits the data encrypted by the first encrypting means to a channel that performs synchronous transmission, and the data encrypted by the second encrypting means performs asynchronous transmission. Send to channel.

The thirty-sixth aspect of the present invention is a decoding apparatus for a transmission system having a channel for performing synchronous transmission and a channel for performing asynchronous transmission, as exemplified in FIG. Receiving means for receiving the channel for performing the synchronous transmission and outputting the data transmitted for the synchronous and for receiving the channel for performing the asynchronous transmission and outputting the data for the asynchronous transmission; Decryption means for decrypting the data transmitted with a decryption key and outputting the decrypted data, and the first decryption means for transmitting the asynchronously transmitted data with the decryption key And a second decoding means for outputting the decoded data by decoding with a decoding algorithm different from the above.

Therefore, according to the thirty-sixth aspect of the present invention, the receiving means receives the channel for synchronous transmission, outputs the data transmitted synchronously, and performs the asynchronous transmission. Is received and the data transmitted asynchronously is output. The first decryption means decrypts the synchronously transmitted data with a decryption key and outputs the decrypted data. The second decryption unit decrypts the asynchronously transmitted data with a decryption key using a decryption algorithm different from that of the first decryption unit, and outputs the decrypted data.

The thirty-eighth aspect of the present invention is an encryption device for a transmission system having a channel for performing synchronous transmission and a channel for performing asynchronous transmission, as exemplified in FIG. A first encryption means for encrypting data transmitted synchronously with a first encryption key and outputting the encrypted data, and data transmitting asynchronously with the first encryption key Is a different second encryption key from the first
Second encryption means for outputting data encrypted and encrypted by an encryption algorithm different from that of the first encryption key and the second encryption key in the same cycle. An encryption key updating unit for updating, the data encrypted by the first encrypting unit is transmitted to the channel for performing the synchronous transmission, and the data encrypted by the second encrypting unit is transmitted. It is composed of transmitting means for transmitting to a channel for asynchronous transmission.

Therefore, according to the thirty-eighth aspect of the present invention, the first encryption means encrypts the data transmitted synchronously with the first encryption key, and outputs the encrypted data. . The second encryption means uses the second encryption key different from the first encryption key to transfer the data transmitted asynchronously,
The data is encrypted by an encryption algorithm different from that of the first encryption means, and the encrypted data is output. The encryption key updating means updates the first encryption key and the second encryption key at the same cycle. The transmitting means transmits the data encrypted by the first encrypting means to a channel that performs synchronous transmission, and the data encrypted by the second encrypting means performs asynchronous transmission. Send to channel.

The 40th aspect of the present invention is a decoding apparatus for a transmission system having a channel for performing synchronous transmission and a channel for performing asynchronous transmission, as exemplified in FIG. Receiving means for receiving the channel for performing the synchronous transmission and outputting the data transmitted for the synchronous and for receiving the channel for performing the asynchronous transmission and outputting the data for the asynchronous transmission; The first decryption means for decrypting the transmitted data with the first decryption key and outputting the decrypted data, and the asynchronously transmitted data with the first decryption key. Second decryption means for decrypting the decrypted data with a different decryption algorithm from the decryption algorithm different from that of the first decryption means, and outputting the decrypted data; the first decryption key; and the first decryption key With a decryption key of 2 It is composed of a decryption key updating means for updating the same period.

Therefore, according to the invention as set forth in claim 40, the receiving means receives the channel for performing the synchronous transmission, outputs the data transmitted in the synchronous manner, and carries out the asynchronous transmission for the channel. Is received and the data transmitted asynchronously is output. The first decryption means decrypts the synchronously transmitted data with the first decryption key and outputs the decrypted data. The second decryption means decrypts the asynchronously transmitted data with a second decryption key different from the first decryption key and with a decryption algorithm different from that of the first decryption means, Output the decrypted data. The decryption key updating means updates the first decryption key and the second decryption key at the same cycle.

The invention according to claim 42 is an encryption / decryption device for a transmission system having a channel for performing synchronous transmission and a channel for performing asynchronous transmission, as exemplified in FIG. 11. In addition, the transmission data multiplexing means for multiplexing the transmission data transmitted synchronously and the transmission data transmitted asynchronously and outputting the multiplexed transmission data, and the reception data transmitted synchronously asynchronously Reception data multiplexing means for multiplexing the received data transmitted and outputting the multiplexed reception data, and for outputting the encrypted data by encrypting the multiplexed transmission data and outputting the multiplexed reception data Encryption / decryption means for decrypting and decrypting the decrypted data, and decrypting the multiplexed data for decrypting the decrypted data and decrypting the received data transmitted in synchronization. And demultiplexing means for outputting the asynchronously transmitted received data, and transmitting the encrypted data to the channel for performing the synchronous transmission and the channel for performing the asynchronous transmission, and the synchronous And a transmission / reception means for receiving a channel for performing various transmissions, outputting reception data transmitted for synchronization, and receiving a channel for performing the asynchronous transmission, and outputting reception data transmitted asynchronously. .

Therefore, according to the forty-second aspect of the present invention, the transmission data multiplexing means multiplexes the transmission data transmitted synchronously and the transmission data transmitted asynchronously, and performs the multiplexed transmission. Output the data. The reception data multiplexing means multiplexes the reception data transmitted synchronously and the reception data transmitted asynchronously, and outputs the multiplexed reception data. The encryption / decryption means encrypts the multiplexed transmission data, outputs the encrypted data,
And the multiplexed received data is decoded and the decoded data is output. The demultiplexing means demultiplexes the decoded data, and outputs the decoded synchronously transmitted reception data and the decoded asynchronously transmitted reception data. The transmission / reception means transmits encrypted data to a channel for synchronous transmission and a channel for asynchronous transmission, and receives a channel for synchronous transmission, and the received data transmitted synchronously. Output, and receive the channel for asynchronous transmission,
The received data transmitted asynchronously is output.

The invention as set forth in claim 54 is an encryption / decryption device for a transmission system having a channel for performing synchronous transmission and a channel for performing asynchronous transmission, as exemplified in FIG. First, the transmission data that is transmitted synchronously is encrypted with an encryption key, the encrypted data is output, and the reception data that is transmitted synchronously is decrypted with a decryption key, and the decrypted data is output. 1 encryption / decryption means and the transmission data transmitted asynchronously are encrypted with the encryption key by an encryption algorithm different from that of the first encryption / decryption means, and the encrypted data is output and asynchronously. Second encryption / decryption means for decrypting the received data transmitted by the decryption key with the decryption key by a decryption algorithm different from that of the first encryption / decryption means, and outputting decrypted data. Transmitting the data encrypted by the encryption / decryption means to the channel for synchronous transmission, transmitting the data encrypted by the second encryption / decryption means to the channel for asynchronous transmission, and A transmitting / receiving means for receiving the channel for performing the synchronous transmission, outputting the reception data transmitted for the synchronous transmission, and receiving the channel for performing the asynchronous transmission, outputting the reception data transmitted for the asynchronous transmission. Has been done.

Therefore, according to the invention of claim 54, the first encryption / decryption means encrypts the transmission data transmitted synchronously with the encryption key, and outputs the encrypted data, Also, the received data transmitted synchronously is decrypted with a decryption key, and the decrypted data is output. The second encryption / decryption means transfers the transmission data transmitted asynchronously,
The encrypted data is encrypted by an encryption algorithm different from that of the first encryption / decryption means, the encrypted data is output, and the received data transmitted asynchronously is first encrypted / decrypted by the decryption key. Decoding is performed by a decoding algorithm different from the decoding means, and the decoded data is output. The transmission / reception means transmits the data encrypted by the first encryption / decryption means to the channel for synchronous transmission, and transmits the data encrypted by the second encryption / decryption means by asynchronous transmission. Send to the channel to perform, and receive the channel to perform synchronous transmission, output the reception data transmitted synchronously, and receive the channel to perform asynchronous transmission,
The received data transmitted asynchronously is output.

The invention described in Item 56 is an encryption / decryption device for a transmission system having a channel for performing synchronous transmission and a channel for performing asynchronous transmission, as exemplified in FIG. , The transmission data transmitted synchronously is encrypted with the first encryption key, the encrypted data is output, and the reception data transmitted synchronously is decrypted with the first decryption key. The first encryption / decryption means for outputting the data and the first encryption / decryption means for the transmission data transmitted asynchronously with the second encryption key different from the first encryption key. The first encryption / decryption means outputs the data encrypted and encrypted by a different encryption algorithm, and the received data transmitted asynchronously with a second decryption key different from the first decryption key. Decoding algorithm different from A second encryption / decryption means for further decrypting and outputting the decrypted data, and the second encryption / decryption means for transmitting the data encrypted by the first encryption / decryption means to the channel for synchronous transmission. The data encrypted by the encryption / decryption means is transmitted to the channel that performs the asynchronous transmission, the channel that performs the synchronous transmission is received, the reception data that is transmitted synchronously is output, and the asynchronous Transmission / reception means for receiving a channel for transmission and outputting reception data asynchronously transmitted, and encryption key update means for updating the first encryption key and the second encryption key in the same cycle. And a decryption key update means for updating the first decryption key and the second decryption key in the same cycle.

Therefore, according to the invention described in Item 56, the first encryption / decryption means encrypts the transmission data to be transmitted synchronously with the first encryption key, and encrypts the encrypted data. The received data that is output and transmitted synchronously is decrypted with the first decryption key, and the decrypted data is output. The second encryption / decryption means uses the second encryption key different from the first encryption key for the transmission data transmitted asynchronously, and uses the encryption algorithm different from the first encryption / decryption means. The received data that is encrypted, outputs the encrypted data, and is asynchronously transmitted is a second decryption key different from the first decryption key and different from the first encryption / decryption means. Decoding is performed by the decoding algorithm, and the decrypted data is output. The transmission / reception means transmits the data encrypted by the first encryption / decryption means to the channel for synchronous transmission, and transmits the data encrypted by the second encryption / decryption means by asynchronous transmission. Send to the channel to do,
And, it receives a channel that performs synchronous transmission, outputs reception data that was transmitted synchronously, receives a channel that performs asynchronous transmission, and outputs reception data that was transmitted asynchronously. The encryption key updating means updates the first encryption key and the second encryption key at the same cycle. The decryption key updating means stores the first decryption key and the second decryption key,
Update at the same cycle.

The invention described in Item 58 is characterized in that a program for causing a computer to execute all or a part of the functions of any one of the encryption device, the decryption device and the encryption / decryption device is recorded. Is a program recording medium.

[0050]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) In the first embodiment, I
An encryption device that encrypts an isochronous packet of two or more channels and a decryption device that decrypts it in the EEE1394 isochronous transmission will be described.

FIG. 1 is a block diagram of an encryption device 10 and a decryption device 11 according to the first embodiment of the present invention. In FIG. 1, 12 is a transmission packet multiplexing means,
13 is a first encryption key, 14 is an nth encryption key, 15 is an encryption key multiplexing means, 16 is an encryption means, 17 is a transmission packet demultiplexing means, 18 is a first isochronous packet generation means, Reference numeral 19 is an nth isochronous packet generation means, 110 is an asynchronous packet generation means, and 11
1 is a transmission means.

Further, 112 is a receiving means, 113 is a first isochronous packet separating means, 114 is an nth isochronous packet separating means, 115 is an asynchronous packet separating means, 116 is a received packet multiplexing means, 1
17 is the first decryption key, 118 is the nth decryption key, 11
Reference numeral 9 is a decryption key multiplexing means, 120 is a decryption means, and 121 is a received packet demultiplexing means.

The same numbers are assigned to the same operations as those described in the section of the prior art. A detailed description of those described in the section of the related art will be omitted.

Embodiment 1 will be described below with reference to FIG.
The encryption device 10 and the decryption device 11 will be described.

The transmission packet multiplexing means 12 time-division-multiplexes the input first to n-th (n is 2 or more and 63 or less) isochronous packets. Encryption key multiplexing means 15
Performs time-division multiplexing of the first to n-th encryption keys 13 and 14. The encryption unit 16 encrypts the time-division multiplexed isochronous packet with the time-division multiplexed encryption key. At this time, the first isochronous packet is the first
The nth isochronous packet is encrypted by the encryption key 13 of FIG.

The time division multiplexing may be performed for each isochronous packet, for example, one packet of MPEG2 (=
(188 bytes). When the encryption unit 16 performs block encryption, time division multiplexing may be performed on the smallest block, for example, in units of 8 bytes. Alternatively, a clock having a frequency twice or more may be used to multiplex every clock, or these plural methods may be used simultaneously.

The packet received by the receiving means 112 is
The header is deleted by the first isochronous packet separating means 113, the nth isochronous packet separating means 114, and the asynchronous packet separating means 115. The reception packet multiplexing means 116 time-division-multiplexes the first to n-th isochronous packets from which the headers have been deleted. The decryption key multiplexing means 119 time-division multiplexes the first to nth decryption keys 117 and 118.

The decryption means 120 decrypts the time-division multiplexed isochronous packet with the time-division multiplexed decryption key. At this time, the first isochronous packet is decrypted by the first decryption key 117, and the nth isochronous packet is decrypted by the nth decryption key 118.
These decryption keys 117 and 118 are separately transmitted using, for example, asynchronous transmission.

As described above, according to the first embodiment, 1
The encryption device 16 can be configured by one encryption means 16 and the decryption device 11 can be configured by one decryption means 120, respectively, and the circuit scale can be significantly reduced. In addition, for example, when encrypting 4 channels, two encryption means are prepared, 2 channels are encrypted by one encryption means, the remaining 2 channels are encrypted by another encryption means, and a total of 4 channels are encrypted. Even if the configuration is such that encryption is performed, the circuit scale can be halved compared to the case where four encryption means are used. In other words, even if not all channels are multiplexed, it is possible to obtain the effect of reducing the circuit scale by multiplexing some channels.

Although the case where the first to nth isochronous packets are encrypted and decrypted has been described in the present embodiment, it is not necessary to encrypt and decrypt all of the n channels, and the necessary packets are required. Only the data may be encrypted or decrypted.

Further, in the present embodiment, IEEE1394
Although the case where the above is used has been described, the circuit scale can be significantly reduced by using the same configuration as long as it is a communication path for transmitting a plurality of channels using the same encryption method.

(Second Embodiment) In the second embodiment, the IE
A description will be given of an encryption / decryption device that encrypts and decrypts a plurality of channels of isochronous packets in the EE1394 isochronous transmission.

In FIG. 2, 20 is an encryption / decryption device, and 2 is
Reference numeral 1 is encryption processing means, 22 is decryption processing means, 23 is encryption / decryption means, and 24 is transmission / reception means. The same numbers are given to those that operate in the same manner as in FIG. Detailed description of these components will be omitted.

The second embodiment will be described below with reference to FIG.
The encryption / decryption device 20 will be described.

The encryption processing means 21 sends the time-division multiplexed isochronous packet and the encryption key time-division multiplexed by the encryption key multiplexing means 15 to the encryption / decryption means 23, and the encryption / decryption means 23 Control to perform encryption.

3A and 3B show a concrete configuration example of the encryption / decryption means 23. 31 is an encryption / decryption processing unit,
Reference numeral 32 is a key generation unit, and 33 is a selector. In FIGS. 3 (a) and 3 (b), D, which is the American standard method for encryption and decryption, is used.
An example of using ES (Data Encryption Standard) in a 16-stage configuration has been shown.

Generally, in the case of block encryption, similar algorithms are often used for encryption and decryption. D
Also in ES, the encryption / decryption processing unit 31 is completely the same in encryption and decryption. The key generation unit 32 uses the key K during encryption.
Assuming that 16 keys of 1, K2, K3, ..., K16 are generated in this order, when decrypting, K16, K15, K
, ..., K1 are generated in this order. Therefore, by switching the input data between the encryption and the decryption by the selector 33 and controlling the key generation order, the encryption / decryption processing unit 31 and the key generation unit 32 can be shared by the encryption and the decryption.

The isochronous packet encrypted by the encryption / decryption means 23 is finally transmitted by the transmission / reception means 24 to the IEEE.
Sent on the E1394 bus.

The transmitting / receiving means 24 is generally composed of a physical layer and a link layer. The physical layer takes in data from the IEEE 1394 bus and arbitrates the bus. The link layer is the first isochronous packet generation means 18, the nth
Isochronous packet generating means 19, asynchronous packet generating means 110, first isochronous packet separating means 113, nth isochronous packet separating means 114 and asynchronous packet separating means 11
5 and the physical layer.

On the other hand, at the time of reception, the isochronous packet is separated from the packet received by the transmitting / receiving means 24. The decryption processing means 22 sends the time-division multiplexed isochronous packet and the decryption key time-division multiplexed by the decryption key multiplexing means 119 to the encryption / decryption means 23, and the encryption / decryption means 23 decrypts them. Control to do.

In the encryption / decryption means 23, encryption and decryption are carried out by time division multiplexing. For this purpose, for example, a clock having a doubled frequency is used to make the encryption and decryption 1 times.
Alternately every clock. Alternatively, it may be performed for each isochronous packet, or for example, in units of one MPEG2 packet (= 188 bytes). Also,
When block encryption is performed by the encryption / decryption means 23, the minimum block, for example, 8 bytes may be time-division multiplexed, or a plurality of these methods may be used simultaneously.

As described above, according to the second embodiment, 1
An encryption / decryption device capable of performing encryption and decryption can be configured with only one encryption / decryption means 23, and the circuit scale can be further greatly reduced.

The isochronous packet may have the effect of reducing the circuit scale by multiplexing some channels without multiplexing all channels. Further, it is not necessary to encrypt and decrypt all the packets, and only the necessary packets may be encrypted and decrypted.

Further, in the present embodiment, IEEE1394
Although the case where the above is used has been described, the circuit scale can be significantly reduced by using the same configuration as long as it is a communication path for transmitting a plurality of channels using the same encryption method.

(Third Embodiment) In the third embodiment, the IE
In the EE1394 isochronous transmission and asynchronous transmission, an encryption device that encrypts the isochronous packet and the asynchronous packet and a decryption device that decrypts the packets will be described.

In FIG. 4, 41 is an encryption device, 42 is a decryption device, 43 is a transmission packet multiplexing means, 44 is an encryption means, 45 is an encryption key, 46 is an encryption key updating means, 4
7 is a transmission packet demultiplexing means, 48 is an isochronous packet generation means, 49 is a transmission means, 410 is a reception means, 411 is an isochronous packet separation means, 412
Is a received packet multiplexing means, 413 is a decoding means, 414
Is a decryption key, 415 is a decryption key update means, and 416 is a received packet demultiplexing means. The same numbers are attached to the same elements as those in FIG. 1 and the related art. Detailed description of these components will be omitted.

The first embodiment of the third embodiment will be described below with reference to FIG.
The encryption device 41 and the decryption device 42, which are the embodiments of the present invention, will be described.

The transmission packet multiplexing means 43 time-division multiplexes the isochronous packet and the asynchronous packet. As shown in FIG. 18A, the isochronous packet and the asynchronous packet are not transmitted at the same time and can be time-division multiplexed.

Isochronous packet encryption key 45
Is updated by the encryption key updating means 46 at regular intervals. FIG. 5A shows an example in which the encryption key 45 of the isochronous packet is updated. In FIG. 5A, during the time T11, the key 11 becomes the encryption key 45, and the time T1
During time 2, the key 12 becomes the encryption key 45, and during time T13, the key 13 becomes the encryption key 45. Time T11, T1
2, T13 are almost the same time interval, for example, about 30 seconds.

FIG. 5B shows how the encryption key 45 of an asynchronous packet is updated. In the example of FIG.
Since the same encryption key 45 and the same encryption key updating means 46 are used for the isochronous packet and the asynchronous packet, the update cycle and the key are the same as those in FIG. 5A.

The transmission packet demultiplexing means 47 separates the isochronous packet and the asynchronous packet, both of which have been encrypted, and the isochronous packet generating means 48 and the asynchronous packet generating means 110 add a header for transmission, and the transmitting means 49. In IEEE13
It is sent out on the 94 bus.

The receiving means 410 receives the packet on the IEEE 1394 bus, and the isochronous packet separating means 411 and the asynchronous packet separating means 115,
The header is removed, and an isochronous packet and an asynchronous packet are output.

The reception packet multiplexing means 412 time division multiplexes the isochronous packet and the asynchronous packet. The decryption key 414 of the isochronous packet and the asynchronous packet is updated by the decryption key update means 415 at the same time as the update cycle of the encryption key update means 46.

In order to make the update cycle of the encryption key update means 46 and the update cycle of the decryption key update means 415 equal, for example, the timing information to be updated may be added to the header of the isochronous packet and transmitted. As a result, the encrypted isochronous packet and asynchronous packet are correctly decrypted by the decryption means 413.

The time-division multiplexed isochronous packet and asynchronous packet are separated by the reception packet demultiplexing means 416, and the decoded isochronous packet and asynchronous packet are output.

As described above, according to the first example of the third embodiment, it is possible to encrypt and transmit an asynchronous packet. Further, by sharing the encryption means 44 and the decryption means 413 between the isochronous packet and the asynchronous packet, it is possible to minimize the increase in the circuit scale due to the encrypted transmission of the asynchronous packet.

FIG. 6 shows a second embodiment in which an isochronous packet and an asynchronous packet are encrypted or decrypted using different keys.

In FIG. 6, 61 is an encryption device, 62 is a decryption device, 63 is an encryption key multiplexing means, 64 is an isochronous encryption key, and 65 is an asynchronous encryption key.
Reference numeral 66 is an isochronous encryption key updating means, 67 is an asynchronous encryption key updating means, 68 is a decryption key multiplexing means, 69 is an isochronous decryption key, 610 is an asynchronous decryption key, and 611 is an isochronous decryption key. Key updating means 612 is an asynchronous decryption key updating means. The same numbers are attached to the same elements as those in FIG. 1 and FIG. Detailed description of these components will be omitted.

Hereinafter, the second embodiment of the third embodiment will be described with reference to FIG.
The encryption device 61 and the decryption device 62, which are the embodiments of the present invention, will be described.

The isochronous encryption key 64 is used by the isochronous encryption key updating means 66, and the asynchronous encryption key 65 is used by the asynchronous encryption key updating means 6.
7 updates each in a predetermined cycle. The isochronous encryption key 64 is updated as shown in FIG. 5A, for example, and the asynchronous encryption key 65 is updated as shown in FIG. 5C.

In FIG. 5C, during the time T21, the key 21 becomes the asynchronous encryption key 65, and the time T2
During 2, the key 22 becomes the asynchronous encryption key 65, and during the time T23, the key 23 becomes the asynchronous encryption key 65. The times T21, T22, T23 are almost the same time intervals, for example, about 30 seconds.

As shown in FIGS. 5A and 5C, no special correlation is required between the times T11, T12, T13 and T21, T22, T23. Also, the keys 11, 1
The keys 2 and 13 and the keys 21, 22 and 23 may be different from each other.

The encryption key multiplexing means 63 time-division multiplexes the isochronous encryption key 64 and the asynchronous encryption key 65. At this time, as shown in FIG.
The isochronous packet and the asynchronous packet are not transmitted at the same time and can be time-division multiplexed.

On the other hand, the isochronous decryption key updating means 611 and the asynchronous decryption key updating means 612 are
The isochronous decryption key 69 and the asynchronous decryption key 610 are updated at the same cycle as the update cycle of the isochronous encryption key updating means 66 and the asynchronous encryption key updating means 67, respectively. The updated isochronous decryption key 69 and the asynchronous decryption key 610 correspond to the isochronous encryption key 64 and the asynchronous encryption key 65.

To make the update cycle of the isochronous encryption key updating means 66 and the update cycle of the isochronous decryption key updating means 611 equal, for example, the timing information to be updated is added to the header of the isochronous packet and transmitted. Good. To make the update cycle of the asynchronous encryption key updating means 67 and the update cycle of the asynchronous decryption key updating means 612 equal, for example, the timing information to be updated is added to the header of the asynchronous packet and transmitted. Good. The isochronous packet and the asynchronous packet encrypted by this,
It is correctly decoded by the decoding means 413.

The decryption key multiplexing means 68 time-division multiplexes the isochronous decryption key 69 and the asynchronous decryption key 610. By decoding with the decoding means 413, the isochronous packet and the asynchronous packet are correctly decoded.

As described above, according to the second example of the third embodiment, it is possible to encrypt and transmit an asynchronous packet. Further, by sharing the encryption means 44 and the decryption means 413 between the isochronous packet and the asynchronous packet, it is possible to suppress an increase in the circuit scale due to the encrypted transmission of the asynchronous packet. Furthermore, by using different keys for the encryption of the isochronous packet and the encryption of the asynchronous packet, the strength against attacks from a third party can be increased as shown in FIG.

FIG. 7 shows a third embodiment in which isochronous packets and asynchronous packets are encrypted or decrypted using different keys.

In FIG. 7, 71 is an encryption device, 72 is a decryption device, 73 is an encryption key updating means, and 74 is a decryption key updating means. The same numbers are assigned to the same operations as those in FIGS. 1, 4, and 6. Detailed description of these components will be omitted.

The third embodiment of the third embodiment will be described below with reference to FIG.
An encryption device 71 and a decryption device 72, which are embodiments of the present invention, will be described.

7 is different from FIG. 6 in that the isochronous encryption key updating means 66 and the asynchronous encryption key updating means 67 are shared and the encryption key updating means 7 is provided.
3 and the isochronous decryption key updating means 61
1 and the decryption key updating means 612 for asynchronous use are made common to be the decryption key updating means 74.

The isochronous encryption key 6 is shown in FIG.
4 and FIG. 5D shows an asynchronous encryption key 65. The update cycles T11, T12 and T13 are the same,
The key shown in FIG. 5D is different from that shown in FIG. 5A in that keys 31, 32, and 33 are included.

As described above, according to the third example of the third embodiment, it is possible to encrypt and transmit an asynchronous packet, and the encryption packet updating means 7 is commonly used.
By using 3 and the decryption key updating means 74, the circuit scale can be made smaller than that in FIG. Further, by using different keys for the encryption of the isochronous packet and the encryption of the asynchronous packet, the strength against attacks from a third party can be increased as shown in FIG.

FIG. 8 shows a fourth embodiment in which a plurality of isochronous packets and asynchronous packets are encrypted or decrypted using different keys.

In FIG. 8, 81 is an encryption device, 82 is a decryption device, 83 is a transmission packet multiplexing means, 84 is an encryption means, 85 is a transmission packet demultiplexing means, 86 is a reception packet multiplexing means, and 87 is a decryption means. A converting unit 88 is a received packet demultiplexing unit. The same numbers are attached to the same elements as those in FIG. 1 and FIG. Detailed description of these components will be omitted.

The fourth embodiment of the third embodiment will be described below with reference to FIG.
The encryption device 81 and the decryption device 82, which are the embodiments of the present invention, will be described.

The transmission packet multiplexing means 83 time division multiplexes the n-channel isochronous packet and the asynchronous packet. These are encryption key multiplexing means 15
The data is encrypted by the encryption means 84 using the encryption key multiplexed in. The transmission packet demultiplexing means 85 releases the time division multiplexing, and outputs the encrypted n-channel isochronous packet and the asynchronous packet.

The reception packet multiplexing means 86 time-division multiplexes the encrypted n-channel isochronous packet and the encrypted asynchronous packet. These are decrypted by the decryption means 87 using the decryption key multiplexed by the decryption key multiplexing means 119. The reception packet demultiplexing unit 88 demultiplexes the time division multiplexing and outputs the decoded n-channel isochronous packet and the asynchronous packet.

As described above, according to the fourth example of the third embodiment, it is possible to encrypt and transmit asynchronous packets and isochronous packets of a plurality of channels. Also, the encryption means 84 and the decryption means 8
By making 7 common, while suppressing the increase in circuit scale,
It is possible to perform encrypted transmission of asynchronous packets and isochronous packets of a plurality of channels.

In this embodiment, IEEE 1394 is used.
Although the case where the above is used has been described, if the communication path is one in which the same encryption method is used for the synchronous transmission and the asynchronous transmission, the circuit size can be significantly reduced by the similar configuration.

(Embodiment 4) In Embodiment 4, according to the IE
In isochronous transmission and asynchronous transmission of EE1394, an encryption device that encrypts an isochronous packet and an asynchronous packet using different means, and a decryption device that decrypts will be described.

In FIG. 9, 91 is an encryption device, 92 is a decryption device, 93 is an isochronous packet encryption means, 94 is an asynchronous packet encryption means, 95 is an isochronous packet decryption means, and 96 is an asynchronous packet decryption means. Is. The same numbers are attached to the same elements as those in FIG. 1 and FIG. Detailed description of these components will be omitted.

The first embodiment of the fourth embodiment will be described below with reference to FIG.
An encryption device 91 and a decryption device 92, which are embodiments of the present invention, will be described.

The isochronous packet encryption means 93 and the asynchronous packet encryption means 94 are encryption means that use different algorithms. Although encryption is performed using the common encryption key 45, the encryption strength is higher than when the same encryption algorithm is used. Moreover, since the common encryption key 45 and the encryption key updating means 46 are used, the circuit scale can be reduced as compared with the case where the encryption key and the encryption key updating means are provided separately.

The isochronous packet decrypting means 95 decrypts the packet encrypted by the isochronous packet encrypting means 93, and the asynchronous packet decrypting means 96 decrypts the packet encrypted by the asynchronous packet encrypting means 94. Similar to the encryption device 91, the circuit scale can be reduced as compared with the case where the decryption key 414 and the decryption key update means 415 are provided separately.

As described above, according to the first example of the fourth embodiment, it is possible to reduce the circuit scale while increasing the encryption strength.

FIG. 10 shows a second example of the fourth preferred embodiment. In FIG. 10, 101 is an encryption device and 102 is a decryption device. The same numbers are assigned to the same operations as those in FIGS. 1, 4, 6, 7, and 9. Detailed description of these components will be omitted.

Hereinafter, with reference to FIG. 10, an encryption device 101 and a decryption device 102 which are a second example of the fourth embodiment.
Will be described.

10 is different from FIG. 9 in that the isochronous encryption key 64 and the asynchronous encryption key 65 are separately provided, and the common encryption key updating means 73 updates the encryption key. , Isochronous decryption key 69
And the asynchronous decryption key 610 are separately provided, and the decryption key is updated by the common decryption key updating means 74.

FIG. 5A shows an isochronous encryption key 6
4 and FIG. 5D shows an asynchronous encryption key 65. The update cycles T11, T12 and T13 are the same,
The keys are different.

As described above, according to the second example of the fourth embodiment, it is possible to encrypt and transmit an asynchronous packet. Further, by using the common encryption key updating means 73 and the decryption key updating means 74, the circuit scale can be reduced as compared to the case where the isochronous packet and the asynchronous packet are completely independently encrypted. Further, by using different keys for encryption of the isochronous packet and encryption of the asynchronous packet, it is possible to increase the strength against attacks from a third party as compared with FIG.

In this embodiment, IEEE 1394 is used.
Although the case where the above is used has been described, if the communication path is one in which the same encryption method is used for the synchronous transmission and the asynchronous transmission, the circuit size can be significantly reduced by the similar configuration.

(Fifth Embodiment) In the fifth embodiment, the IE
An encryption / decryption device that performs encryption and decryption using the same encryption / decryption means in EE1394 isochronous transmission and asynchronous transmission will be described.

In FIG. 11, reference numeral 1100 is an encryption / decryption device, 1101 is an encryption processing means, 1102 is a decryption processing means, 1103 is an encryption / decryption means, 1104 is an encryption / decryption key multiplexing means, and 1105 is a transmission / reception means. . The same numbers are attached to the same elements as those in FIG. 1 and FIG. Detailed description of these components will be omitted.

The encryption / decryption device 1100, which is the first example of the fifth embodiment, will be described below with reference to FIG.

The encryption processing means 1101 performs encryption / decryption means 11 on the isochronous packet and the asynchronous packet time-division multiplexed by the transmission packet multiplexing means 43.
Encrypt with 03. Transmission packet demultiplexing means 4
In step 7, the transmission / reception means 110 separates the isochronous packet and the asynchronous packet, both of which are encrypted.
5 is sent out on the IEEE 1394 bus.

On the other hand, the receiving process from the IEEE 1394 bus is performed by the transmitting / receiving means 1105, the header is deleted by the isochronous packet separating means 411 and the asynchronous packet separating means 115, and the isochronous packet and the asynchronous packet are separated. The reception packet multiplexing means 412 time-division multiplexes the isochronous packet and the asynchronous packet.

The decryption processing means 1102 uses the encryption / decryption means 1103 to decrypt the time-division multiplexed isochronous packet and asynchronous packet. The reception packet demultiplexing unit 416 separates the isochronous packet and the asynchronous packet, which are both decoded, and outputs them.

A concrete configuration example of the encryption / decryption means 1103 is as shown in FIG. By using the circuit for encryption and decryption as compared with the case where the circuit is configured independently,
The circuit scale can be significantly reduced.

The encryption / decryption key multiplexing means 1104 time-division multiplexes the encryption key 45 and the decryption key 414 at the timing of the packet to be encrypted and decrypted. The encryption key updating means 46 and the decryption key updating means 415 update the encryption key 45 and the decryption key 414, respectively, at a predetermined cycle.

As shown in FIG. 18A, since the isochronous packet and the asynchronous packet are originally time division multiplexed, they can be processed by time division multiplexing using one encryption / decryption means 1103. it can. It is necessary to perform encryption and decryption at the same timing, and the encryption / decryption means 1103 performs encryption and decryption by time division multiplexing. For this, for example, a clock having a double frequency is used. By using this, encryption and decryption may be alternately performed every clock. Alternatively, it may be performed for each isochronous packet. For example, one packet of MPEG2 (= 1
(88 bytes). When block encryption is performed by the encryption / decryption unit 1103, the minimum block, for example, 8 bytes may be time-division multiplexed, or these plural methods may be used simultaneously.

As described above, according to the first embodiment of the fifth embodiment, the encryption / decryption of the isochronous packet and the asynchronous packet can be performed by only one encryption / decryption means 1103. Decoding device 1100
Can be configured, and the circuit scale can be significantly reduced.

FIG. 12 shows an encryption / decryption device which is a second example of the fifth embodiment. 12
In the figure, reference numeral 1200 is an encryption / decryption device, and 1201 is an encryption / decryption key multiplexing means. The same numbers are assigned to the same operations as those in FIGS. 6 and 11. Detailed description of these components will be omitted.

A second embodiment of the fifth embodiment of the encryption / decryption device 1200 will be described below with reference to FIG.

The difference from FIG. 11 is that the isochronous encryption key 64 and the asynchronous encryption key 65, and the isochronous encryption key updating means 66 and the asynchronous encryption key updating means 67 are separately provided. . Further, an isochronous decryption key 69 and an asynchronous decryption key 610, and an isochronous decryption key updating means 611 and an asynchronous decryption key updating means 612 are separately provided.

The encryption / decryption key multiplexing means 1201 has the isochronous encryption key 64 and the asynchronous encryption key 6.
5, and the isochronous decryption key 69 and the asynchronous decryption key 610 are time-division multiplexed. These keys are multiplexed at the timing of encryption and decryption by the encryption / decryption means 1103.

As described above, according to the second example of the fifth embodiment, the encryption / decryption capable of encrypting and decrypting the isochronous packet and the asynchronous packet with only one encryption / decryption means 1103. Device 1200
Can be configured, and the circuit scale can be reduced. Further, by providing the isochronous encryption key 64 and the asynchronous encryption key 65 separately, the encryption strength can be increased as compared with FIG.

FIG. 13 shows an encryption / decryption device which is a third example of the fifth embodiment. FIG.
In the above, reference numeral 1300 is an encryption / decryption device, and those having the same operations as those in FIG. 1, FIG. 4, FIG. 7, and FIG. Detailed description of these components will be omitted.

Hereinafter, the encryption / decryption device 1300 according to the third embodiment of the fifth embodiment will be described with reference to FIG.

The difference from FIG. 12 is that the isochronous encryption key updating means 66 and the asynchronous encryption key updating means 67 are shared to provide the encryption key updating means 73, and the isochronous decryption key updating. This is that the means 611 and the asynchronous decryption key updating means 612 are shared and the decryption key updating means 74 is provided.

By sharing the isochronous encryption key updating means 66 and the asynchronous encryption key updating means 67, the circuit scale can be reduced as compared with FIG. Further, by providing the isochronous encryption key 64 and the asynchronous encryption key 65 separately, the encryption strength is higher than that in FIG.

As described above, according to the third example of the fifth embodiment, the circuit scale can be reduced by providing the encryption key updating means 73 and the decryption key updating means 74. Also,
By separately providing the isochronous encryption key 64 and the asynchronous encryption key 65, the encryption strength can be increased.

FIG. 14 shows an encryption / decryption device which is a fourth example of the fifth embodiment. 14
In the figure, reference numeral 1400 is an encryption / decryption device, 1401 is an encryption processing means, 1402 is a decryption processing means, and 1403 is an encryption / decryption means. The same numbers are assigned to those that operate in the same manner as in FIGS. 1, 2, 6, and 8. Detailed description of these components will be omitted.

Hereinafter, an encryption / decryption device 1400, which is a fourth example of the fifth embodiment, will be described with reference to FIG.

The difference from FIG. 8 is that the encryption device 81 and the decryption device 82 are integrated, the encryption means 84 and the decryption means 87 are shared, and the encryption processing means 1401, the decryption processing means 1402, The point is that the encryption / decryption means 1403 is provided.

The transmission packet multiplexing means 83 time-division-multiplexes each of the isochronous packets consisting of a plurality of channels and the asynchronous packet. Encryption processing means 1
401 uses the encryption / decryption means 1403 to encrypt the time division multiplexed packet. Similarly, the decryption processing unit 1402 uses the encryption / decryption unit 1403 to decrypt the time division multiplexed packet.

A concrete configuration example of the encryption / decryption means 1403 is as shown in FIG. By using the circuit for encryption and decryption as compared with the case where the circuit is configured independently,
The circuit scale can be significantly reduced.

As described above, according to the fourth example of the fifth embodiment, by providing the encryption processing means 1401, the decryption processing means 1402, and the encryption / decryption means 1403, isochronous packets of a plurality of channels can be transmitted. It is possible to perform encryption and decryption of each and the asynchronous packet, and it is possible to reduce the circuit scale.

In this embodiment, IEEE 1394 is used.
Although the case where the above is used has been described, if the communication path is one in which the same encryption method is used for the synchronous transmission and the asynchronous transmission, the circuit size can be significantly reduced by the similar configuration.

(Sixth Embodiment) In the sixth embodiment, the IE
In the EE1394 isochronous transmission and the asynchronous transmission, different encryption / decryption means are used,
An encryption / decryption device that performs encryption and decryption will be described.

In FIG. 15, 1500 is an encryption / decryption device, 1501 is an isochronous encryption processing means, and 1502.
Is an asynchronous encryption processing means, 1503 is an isochronous decryption processing means, 1504 is an asynchronous decryption processing means, 1505 is an isochronous encryption decryption means, 15
Reference numeral 06 is an asynchronous encryption / decryption means, and 1507 is an encryption / decryption key multiplexing means. The same numbers are assigned to the same operations as those in FIGS. Detailed description of these components will be omitted.

The encryption / decryption device 1500 according to the sixth embodiment will be described below with reference to FIG.

The difference from FIG. 9 is that the encryption device 91 and the decryption device 92 are integrated, the isochronous packet encryption means 93 and the isochronous packet decryption means 95 are shared, and the isochronous encryption decryption means 1505.
And the asynchronous packet encryption means 94.
This is the point that the asynchronous packet decryption means 96 is shared and the asynchronous encryption / decryption means 1506 is provided.

The isochronous cryptographic processing means 1501
The isochronous encryption / decryption unit 1505 is used to encrypt the isochronous packet. The asynchronous encryption processing means 1502 is the asynchronous encryption / decryption means 1
506 is used to encrypt the asynchronous packet. The encryption / decryption key multiplexing unit 1507 converts the encryption key 45 commonly used by the isochronous packet and the asynchronous packet into the isochronous encryption / decryption unit 15.
05 and the asynchronous encryption / decryption means 1506.

Decoding is performed similarly. That is, the isochronous decryption processing unit 1503 uses the isochronous encryption decryption unit 1505 to decrypt the isochronous packet. Asynchronous decoding processing means 1504
Using the asynchronous encryption / decryption means 1506,
Decode an asynchronous packet. The encryption / decryption key multiplexing means 1507 uses the decryption key 414 commonly used by the isochronous packet and the asynchronous packet.
Is output to the isochronous encryption / decryption means 1505 and the asynchronous encryption / decryption means 1506.

Isochronous encryption / decryption means 1505,
A specific configuration example of the asynchronous encryption / decryption means 1506 is as shown in FIG. By using the circuit also for encryption and decryption, the circuit scale can be significantly reduced as compared with the case where the circuit is independently configured.

It is necessary to perform encryption and decryption at the same timing. Isochronous encryption / decryption means 15
In 05, encryption and decryption are performed by time division multiplexing. For this purpose, for example, a clock having a double frequency may be used, and encryption and decryption may be performed alternately every clock. Similarly, in the asynchronous encryption / decryption means 1506, encryption and decryption are performed by time division multiplexing. For this, for example, a clock having a double frequency is used to perform encryption and decryption every clock. You can do it alternately. Alternatively, for example, time division multiplexing may be performed for each packet. When block encryption is performed by the isochronous encryption / decryption means 1505 and the asynchronous encryption / decryption means 1506, the minimum block, for example, 8 bytes may be time-division multiplexed, or these multiple methods may be used simultaneously. Good.

As described above, according to the sixth embodiment, by providing the isochronous encryption / decryption means 1505 and the asynchronous encryption / decryption means 1506, the isochronous packet and the asynchronous packet can be independently encrypted and decrypted. You can do it, and the strength of encryption is high. Moreover, by using the encryption key 45 and the decryption key 414 common to the isochronous packet and the asynchronous packet, it is possible to reduce the scale of the circuit for generating the key.

In this embodiment, IEEE 1394 is used.
Although the case where the above is used has been described, if the communication path is one in which the same encryption method is used for the synchronous transmission and the asynchronous transmission, the circuit size can be significantly reduced by the similar configuration.

(Embodiment 7) In Embodiment 7, according to IE
An encryption / decryption device for performing encryption and decryption using different encryption / decryption means and keys in isochronous transmission and asynchronous transmission of EE1394 will be described.

In FIG. 16, reference numeral 1600 is an encryption / decryption device, and those having the same operations as those in FIGS. 1, 2, 4, 6, 7, and 15 have the same reference numerals. Detailed description of these components will be omitted.

The encryption / decryption device 1600 according to the seventh embodiment will be described below with reference to FIG.

15 is different from FIG. 15 in that an isochronous encryption key 64 and an asynchronous encryption key 65 are separately provided in place of the encryption key 45, and an isochronous decryption key is used instead of the decryption key 414. The key 69 and the asynchronous decryption key 610 are provided separately.

By making the key updating cycle common to the encryption key updating means 73, the scale of the circuit required for key updating can be reduced, and the isochronous encryption key 64 and the asynchronous encryption key 65 can be combined. By providing them separately, the strength of encryption is high. Also, the isochronous encryption / decryption means 1
505 and the asynchronous encryption / decryption means 1506,
By sharing encryption and decryption, the circuit scale can be greatly reduced.

As described above, according to the seventh embodiment, it is possible to reduce the circuit scale for performing the key update, and by providing the isochronous encryption key 64 and the asynchronous encryption key 65 separately. , The encryption strength is high,
By sharing the isochronous encryption / decryption means 1505 and the asynchronous encryption / decryption means 1506 for encryption and decryption, the circuit scale can be greatly reduced.

In this embodiment, IEEE 1394 is used.
Although the case where the above is used has been described, if the communication path is one in which the same encryption method is used for the synchronous transmission and the asynchronous transmission, the circuit size can be significantly reduced by the similar configuration.

[0168]

As described above, according to the present invention, by using the isochronous encryption means or decryption means and the asynchronous encryption means or decryption means in common, It is possible to transmit data concealed by a person, and it is possible to significantly reduce the circuit scale, which has a great practical effect.

[Brief description of drawings]

FIG. 1 is a block diagram showing configurations of an encryption device and a decryption device according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of an encryption / decryption device according to a second embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration example of an encryption / decryption means in the second embodiment, wherein (a) shows an encryption mode and (b) shows a decryption mode.

FIG. 4 is a block diagram showing configurations of an encryption device and a decryption device that are a first example of the third embodiment of the present invention.

5 (a) to (d) are signal waveform diagrams showing an example of an encryption key according to the third embodiment.

FIG. 6 is a block diagram showing configurations of an encryption device and a decryption device that are a second example of the third embodiment of the present invention.

FIG. 7 is a block diagram showing configurations of an encryption device and a decryption device that are a third example of Embodiment 3 of the present invention.

FIG. 8 is a block diagram showing a configuration of an encryption device and a decryption device that are a fourth example of Embodiment 3 of the present invention.

FIG. 9 is a block diagram showing configurations of an encryption device and a decryption device that are a first example of the fourth embodiment of the present invention.

FIG. 10 is a block diagram showing configurations of an encryption device and a decryption device that are a second example of the fourth embodiment of the present invention.

FIG. 11 is a block diagram showing a configuration of an encryption / decryption device that is a first example of the fifth exemplary embodiment of the present invention.

FIG. 12 is a block diagram showing a configuration of an encryption / decryption device that is a second example of the fifth exemplary embodiment of the present invention.

FIG. 13 is a block diagram showing a configuration of an encryption / decryption device that is a third example of the fifth exemplary embodiment of the present invention.

FIG. 14 is a block diagram showing a configuration of an encryption / decryption device that is a fourth example of the fifth exemplary embodiment of the present invention.

FIG. 15 is a block diagram showing a configuration of an encryption / decryption device according to a sixth embodiment of the present invention.

FIG. 16 is a block diagram showing a configuration of an encryption / decryption device according to a seventh embodiment of the present invention.

FIG. 17 is a block diagram showing a first example of configurations of a conventional encryption device and decryption device.

18 (a) and 18 (b) are signal waveform diagrams showing packets transmitted on the IEEE 1394 bus.

FIG. 19 is a block diagram showing a second example of configurations of a conventional encryption device and decryption device.

[Explanation of symbols]

10 Encryption device 11 Decoding device 12 Transmission packet multiplexing means 13 First encryption key 14th nth encryption key 15 Encryption key multiplexing means 16 encryption means 17 Transmission packet demultiplexing means 18 First isochronous packet generation means 19th nth isochronous packet generation means 110 Asynchronous packet generation means 111 Transmission means 112 Receiving means 113 First Isochronous Packet Separation Means 114th nth isochronous packet separating means 115 Asynchronous packet separation means 116 received packet multiplexing means 117 First decryption key 118 nth decryption key 119 Decryption key multiplexing means 120 Decoding means 121 receiving packet demultiplexing means

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 5J104 AA01 BA06 NA02                 5K028 CC01 KK01 KK03 KK12 SS04                       SS14                 5K033 AA04 AA08 BA01 DB10 DB11                       DB17                 5K034 AA11 DD01 HH01 HH02 JJ11                       KK21

Claims (58)

[Claims] 1. An encryption device for a transmission method for synchronously transmitting a plurality of data using a plurality of channels, wherein all or at least two data of the plurality of data are multiplexed and multiplexed. Transmission data multiplexing means for outputting the data, encryption means for encrypting the multiplexed data and outputting the encrypted data, and the encrypted data for all or at least two of the plurality of channels. An encryption device comprising: a transmission means for transmitting to one channel. 2. The encryption device according to claim 1, wherein said transmission data multiplexing means multiplexes all or at least two of said plurality of data on a time axis basis every clock. 3. The data is packetized, and the transmission data multiplexing means multiplexes all or at least two of the plurality of data on a time axis basis for each packet or for each plurality of packets. The encryption device according to claim 1. 4. The encryption means performs block encryption in block units, and the transmission data multiplexing means multiplexes all or at least two of the plurality of data on a time axis basis for each block. The encryption device according to claim 1. 5. The transmission method for synchronously transmitting is IE
The encryption device according to any one of claims 1 to 4, wherein the encryption device is an isochronous transmission system via an EE1394 bus. 6. A decoding device for a transmission system for synchronously transmitting a plurality of data using a plurality of channels, comprising: a receiving unit that receives the plurality of channels and outputs the received data. Received data multiplexing means for multiplexing all or at least two data of the received data and outputting the multiplexed data, and decoding means for decoding the multiplexed data and outputting the decoded data And a demultiplexing unit that demultiplexes the decoded data and outputs all or at least two of the plurality of data. 7. The decoding apparatus according to claim 6, wherein said reception data multiplexing means time-multiplexes all or at least two of said received data on a time axis basis every clock. 8. The data is packetized, and the reception data multiplexing means time-multiplexes all or at least two pieces of the received data for each packet or for every plural packets. The decoding device according to claim 6. 9. The decoding means performs block decoding on a block-by-block basis, and the reception data multiplexing means time-multiplexes all or at least two pieces of the received data for each block. The decoding device according to claim 6. 10. The transmission method for synchronously transmitting is I
The decoding device according to any one of claims 6 to 9, which is an isochronous transmission system via an EEE1394 bus. 11. An encryption / decryption device for a transmission method for synchronously transmitting a plurality of data using a plurality of channels, wherein all or at least two of the plurality of transmission data are multiplexed and multiplexed. Transmission data multiplexing means for outputting the encrypted transmission data, and encrypts the multiplexed transmission data, outputs the encrypted data, and decrypts the multiplexed reception data, and the decrypted data An encryption / decryption means for outputting, and a transmission / reception means for transmitting the encrypted data to all or at least two channels of the plurality of channels, receiving the plurality of channels, and outputting the received data, Reception data multiplexing means for multiplexing all or at least two of the received data and outputting the multiplexed reception data Solves the multiplexing of the decoded data, the cryptogram decoder being characterized in that a demultiplexing means for outputting all or at least two received data of a plurality of received data. 12. The transmission data multiplex means time-multiplexes all or at least two pieces of transmission data of the plurality of transmission data every clock, and the reception data multiplex means receives the received data every one clock. 12. The encryption / decryption device according to claim 11, wherein all or at least two data items are time-axis multiplexed, and the encryption / decryption unit alternately performs encryption and decryption every clock. 13. The data is packetized, and the transmission data multiplexing means time-axis multiplexes all or at least two data of the plurality of transmission data for each packet or for every plural packets, The multiplexing means time-multiplexes all or at least two pieces of the received data for each packet or for every plural packets, and the encryption / decryption means performs encryption and decryption for each packet or every plural packets. The encryption / decryption device according to claim 11, wherein and are alternately performed. 14. The encryption / decryption means performs block encryption or block decryption on a block-by-block basis, and the transmission data multiplexing means sets all or at least two of the plurality of transmission data on a time axis basis for each block. The received data multiplexing means performs time-axis multiplexing of all or at least two pieces of the received data for each block, and the encryption / decryption means alternates encryption and decryption for each block. The encryption / decryption device according to claim 11, wherein 15. The transmission method for synchronously transmitting is I
The encryption / decryption device according to any one of claims 11 to 14, wherein the encryption / decryption device is an isochronous transmission system via an EEE1394 bus. 16. An encryption device for a transmission system having a channel for performing synchronous transmission and a channel for performing asynchronous transmission, wherein data to be transmitted synchronously and data to be asynchronously transmitted. And a transmission data multiplexing means for outputting the multiplexed data, an encryption means for encrypting the multiplexed data and outputting the encrypted data, the encrypted data An encryption device, comprising: a channel for performing synchronous transmission and a transmission unit for transmitting to the channel for performing asynchronous transmission. 17. The cipher according to claim 16, wherein the transmission data multiplexing means time-axis multiplexes the synchronously transmitted data and the asynchronously transmitted data for each clock. Device. 18. The synchronously transmitted data is packetized, and the asynchronously transmitted data is packetized, and the transmission data multiplexing means is for each packet or for every plural packets. 17. The encryption device according to claim 16, wherein the synchronously transmitted data and the asynchronously transmitted data are time-axis multiplexed. 19. The encryption unit performs block encryption on a block-by-block basis, and the transmission data multiplex unit time-transmits the synchronously transmitted data and the asynchronously transmitted data for each block. The encryption device according to claim 16, wherein the encryption is performed by axis multiplexing. 20. The encryption key used when the encryption unit performs encryption is the same for the data transmitted synchronously and the data transmitted asynchronously. 20. The encryption device according to claim 19. 21. The encryption key used when the encryption unit performs encryption is different between the synchronously transmitted data and the asynchronously transmitted data. The encryption device according to any one of 1. 22. The encryption key is updated at a predetermined cycle, and the predetermined cycle is the same for the data transmitted synchronously and the data transmitted asynchronously. Item 21. The encryption device according to Item 21. 23. The channel for performing the synchronous transmission includes a plurality of channels, and an encryption key used when the encryption unit performs the encryption is different for each of the plurality of channels. ~
23. The encryption device according to any one of 19, 21, and 22. 24. The synchronous transmission is IEEE139.
17. The isochronous transmission via a 4-bus, and the asynchronous transmission is an asynchronous transmission via an IEEE1394 bus.
23. The encryption device according to any one of claims 23 to 23. 25. A decoding device for a transmission system having a channel for performing synchronous transmission and a channel for performing asynchronous transmission, wherein the decoding device receives the channel for performing synchronous transmission and synchronously Receiving means for outputting the transmitted data, receiving the channel for performing the asynchronous transmission, and outputting the asynchronously transmitted data; and the synchronously transmitted data and the asynchronously transmitted data. Reception data multiplexing means for multiplexing the received data and outputting the multiplexed data, decoding means for decoding the multiplexed data and outputting the decoded data, and the decoded data And demultiplexing means for outputting the decoded synchronously transmitted data and the decoded asynchronously transmitted data. That the decoding device. 26. The decoding according to claim 25, wherein the reception data multiplexing means time-axis multiplexes the synchronously transmitted data and the asynchronously transmitted data for each clock. Device. 27. The synchronously transmitted data is packetized, and the asynchronously transmitted data is packetized, and the received data multiplexing means is for each packet or for every plural packets. 26. The decoding apparatus according to claim 25, wherein the synchronously transmitted data and the asynchronously transmitted data are time-axis multiplexed. 28. The decoding means performs block decoding on a block-by-block basis, and the reception data multiplexing means time-wise compares the data transmitted synchronously and the data transmitted asynchronously for each block. 26. The decoding device according to claim 25, wherein the decoding is axially multiplexed. 29. The decryption key used by the decryption means for decryption is the same for the data transmitted synchronously and the data transmitted asynchronously. 29. The decoding device according to any one of items 28 to 28. 30. The decryption key for decryption by the decryption means is different between the synchronously transmitted data and the asynchronously transmitted data. The decoding device according to any one of 1. 31. The decryption key is updated at a predetermined cycle, and the predetermined cycle is the same for the synchronously transmitted data and the asynchronously transmitted data. Item 30. The decoding device according to Item 30. 32. The channel for performing the synchronous transmission includes a plurality of channels, and a decryption key used when the decryption unit performs the decryption is different for each of the plurality of channels. ~
28. The decoding device according to any one of 28, 30 and 31. 33. The synchronous transmission is IEEE139.
26. Isochronous transmission via 4 buses, wherein said asynchronous transmission is asynchronous transmission via IEEE 1394 bus.
33. The decoding device according to any one of items 32 to 32. 34. An encryption device for a transmission system having a channel for performing synchronous transmission and a channel for performing asynchronous transmission, wherein data to be transmitted synchronously is encrypted with an encryption key, A first encryption unit that outputs encrypted data; and data that is asynchronously transmitted by the first encryption unit using the encryption key.
Second encryption means for encrypting the data encrypted by an encryption algorithm different from that of the first encryption means and outputting the encrypted data, and the data encrypted by the first encryption means for the synchronous transmission. An encryption device, comprising: a transmission unit that transmits to a channel that performs transmission and transmits the data encrypted by the second encryption unit to a channel that performs the asynchronous transmission. 35. The synchronous transmission is IEEE139.
35. Isochronous transmission via 4 buses, wherein said asynchronous transmission is asynchronous transmission via IEEE 1394 bus.
The encryption device described. 36. A decoding device for a transmission system having a channel for performing synchronous transmission and a channel for performing asynchronous transmission, wherein the decoding device receives the channel for performing synchronous transmission and synchronously receives the channel. Receiving means for outputting the transmitted data, receiving the channel for performing the asynchronous transmission, and outputting the asynchronously transmitted data, and decrypting the synchronously transmitted data with a decryption key ,
First decryption means for outputting decrypted data, and the asynchronously transmitted data is decrypted with the decryption key by a decryption algorithm different from that of the first decryption means, and is decrypted. And a second decoding means for outputting the data. 37. The synchronous transmission is IEEE139.
37. Isochronous transmission via 4 buses, wherein said asynchronous transmission is asynchronous transmission via IEEE 1394 bus.
Decoding device as described. 38. An encryption device for a transmission system having a channel for performing synchronous transmission and a channel for performing asynchronous transmission, wherein data to be transmitted synchronously is converted by a first encryption key. A first encryption means for encrypting and outputting encrypted data; and a first encryption means for encrypting data transmitted asynchronously with a second encryption key different from the first encryption key. A second encryption unit that encrypts with a different encryption algorithm from the unit and outputs the encrypted data, and the first encryption key and the second encryption key are updated at the same cycle. An encryption key updating means, the data encrypted by the first encryption means is transmitted to the channel for performing the synchronous transmission, and the data encrypted by the second encryption means is asynchronously transmitted. Transmission to a channel that performs dynamic transmission Encryption device being characterized in that a means. 39. The synchronous transmission is IEEE139.
39. The isochronous transmission via a 4-bus, and the asynchronous transmission is an asynchronous transmission via an IEEE 1394 bus.
The encryption device described. 40. A decoding device for a transmission system having a channel for performing synchronous transmission and a channel for performing asynchronous transmission, wherein the decoding device receives the channel for performing synchronous transmission and synchronously receives the channel. Receiving means for outputting the transmitted data, receiving the channel for performing the asynchronous transmission, and outputting the asynchronously transmitted data; and a first decryption key for the synchronously transmitted data. And a second decryption key that decrypts the asynchronously transmitted data with a second decryption key different from the first decryption key. Second decryption means for decrypting data by a decryption algorithm different from that of the decryption means and outputting the decrypted data, the first decryption key and the second decryption key in the same cycle Decryption key update means to update Decoding apparatus characterized by comprising a. 41. The synchronous transmission is IEEE139.
41. Isochronous transmission via a 4-bus, wherein the asynchronous transmission is an asynchronous transmission via an IEEE 1394 bus.
Decoding device as described. 42. An encryption / decryption device for a transmission method having a channel for performing synchronous transmission and a channel for performing asynchronous transmission, the transmission / reception data being transmitted asynchronously with the transmission data transmitted synchronously. Transmission data multiplexing means for outputting the multiplexed transmission data, and the reception data transmitted synchronously and the reception data transmitted asynchronously are multiplexed, and the multiplexed reception A reception data multiplexing means for outputting data, an encryption of the multiplexed transmission data, an output of the encrypted data, a decryption of the multiplexed reception data, and an output of the decrypted data Decryption means, demultiplexing the decrypted data, decrypted the synchronously transmitted reception data, and decrypted the asynchronously transmitted reception data. Demultiplexing means for outputting the encrypted data, transmitting the encrypted data to the channel for performing the synchronous transmission and the channel for performing the asynchronous transmission, and receiving the channel for performing the synchronous transmission. ,
An encryption / decryption device, comprising: a transmission / reception unit that outputs reception data that is transmitted synchronously, receives a channel that performs the asynchronous transmission, and outputs the reception data that is transmitted asynchronously. apparatus. 43. The transmission data multiplexing means time-multiplexes the synchronously transmitted transmission data and the asynchronously transmitted transmission data for each clock. Encryption / decryption device. 44. The reception data multiplexing means time-multiplexes the synchronously transmitted reception data and the asynchronously transmitted reception data for each clock. Encryption / decryption device. 45. The transmission data transmitted synchronously is packetized, and the transmission data transmitted asynchronously is packetized, and the transmission data multiplexing means is one packet or plural packets. 43. The encryption / decryption device according to claim 42, wherein the transmission data transmitted synchronously and the transmission data transmitted asynchronously are time-axis multiplexed for each time. 46. The reception data transmitted synchronously is packetized, and the reception data transmitted asynchronously is packetized, and the reception data multiplexing means is one packet or plural packets. 43. The encryption / decryption device according to claim 42, wherein the reception data transmitted synchronously and the reception data transmitted asynchronously are time-axis multiplexed for each time. 47. The encryption / decryption means performs block encryption in block units, and the transmission data multiplexing means, for each block, the transmission data transmitted synchronously and the transmission data transmitted asynchronously. 43. The encryption / decryption device according to claim 42, wherein and are time-axis multiplexed. 48. The encryption / decryption means performs block decryption on a block-by-block basis, and the reception data multiplexing means, for each block, the reception data transmitted synchronously and the reception data transmitted asynchronously. 43. The encryption / decryption device according to claim 42, wherein and are time-axis multiplexed. 49. The encryption key used when the encryption / decryption means performs encryption is the same for the synchronously transmitted transmission data and the asynchronously transmitted transmission data, and decryption is performed. 49. The cipher according to any one of claims 42 to 48, wherein a decryption key when performing is the same for the synchronously transmitted reception data and the asynchronously transmitted reception data. Decoding device. 50. When the encryption key used by the encryption / decryption means for encryption is different between the synchronously transmitted transmission data and the asynchronously transmitted transmission data, and when the decryption is performed 49. The encryption / decryption device according to any one of claims 42 to 48, wherein the decryption key is different between the reception data transmitted synchronously and the reception data transmitted asynchronously. 51. The encryption key is updated in a first cycle, the decryption key is updated in a second cycle, and the first cycle is asynchronous with the transmission data transmitted synchronously. Is the same as the transmission data that is transmitted,
The encryption / decryption device according to claim 50, wherein the second cycle is the same for the reception data transmitted synchronously and the reception data transmitted asynchronously. 52. A channel for performing the synchronous transmission is composed of a plurality of channels, an encryption key used when the encryption / decryption means performs encryption is different for each of the plurality of channels, and a decryption is performed 52. The decryption key according to claim 1, wherein the decryption key is different for each of the plurality of channels.
The encryption / decryption device according to the item. 53. The synchronous transmission is IEEE139.
43. Isochronous transmission via 4 buses, wherein said asynchronous transmission is asynchronous transmission via IEEE 1394 bus.
Item 53. The encryption / decryption device according to any one of items 52 to 52. 54. An encryption / decryption device for a transmission system having a channel for performing synchronous transmission and a channel for performing asynchronous transmission, wherein transmission data to be transmitted synchronously is encrypted with an encryption key. Turned into
First encryption / decryption means for outputting encrypted data, decrypting received data transmitted synchronously with a decryption key, and outputting the decrypted data, and transmission transmitted asynchronously The data is encrypted with the encryption key by an encryption algorithm different from that of the first encryption / decryption means, the encrypted data is output, and the received data transmitted asynchronously is converted with the decryption key. First
Second encryption / decryption means for decrypting data by a decryption algorithm different from that of the encryption / decryption means and outputting the decrypted data, and the data encrypted by the first encryption / decryption means in the synchronous manner. Data is transmitted to a channel for performing asynchronous transmission, the data encrypted by the second encryption / decryption means is transmitted to the channel for performing asynchronous transmission, and the channel for performing the synchronous transmission is received and synchronized. Encryption / decryption device comprising: a transmission / reception unit that outputs reception data that is transmitted asynchronously, receives a channel that performs the asynchronous transmission, and outputs the reception data that is transmitted asynchronously. . 55. The synchronous transmission is IEEE139.
55. The isochronous transmission via a 4-bus, and the asynchronous transmission is an asynchronous transmission via an IEEE 1394 bus.
The encryption / decryption device according to. 56. An encryption / decryption device for a transmission system having a channel for performing synchronous transmission and a channel for performing asynchronous transmission, wherein transmission data to be transmitted synchronously is first encrypted. A first encryption / decryption means for encrypting with a key, outputting encrypted data, decrypting the received data transmitted synchronously with a first decryption key, and outputting the decrypted data; , Encrypted data transmitted asynchronously by a second encryption key different from the first encryption key by an encryption algorithm different from that of the first encryption / decryption means, and encrypted data And decrypting the received data transmitted asynchronously with a second decryption key different from the first decryption key by a decryption algorithm different from that of the first encryption / decryption means, Output the converted data Second encryption / decryption means, and the data encrypted by the first encryption / decryption means is transmitted to the channel for synchronous transmission, and is encrypted by the second encryption / decryption means. Data is transmitted to the asynchronous transmission channel, the synchronous transmission channel is received, synchronously transmitted reception data is output, and the asynchronous transmission channel is received. Then, a transmitting / receiving unit that outputs the received data transmitted asynchronously, an encryption key updating unit that updates the first encryption key and the second encryption key in the same cycle, and the first The decryption key updating means for updating the decryption key and the second decryption key in the same cycle. 57. The synchronous transmission is IEEE139.
57. Isochronous transmission via a 4-bus, wherein the asynchronous transmission is an asynchronous transmission via an IEEE 1394 bus.
The encryption / decryption device according to. 58. A program for causing a computer to execute all or a part of the functions of the encryption device, the decryption device, or the encryption / decryption device according to claim 1. Characteristic program recording medium.