JPH0220188A - Pay television receiver - Google Patents

Abstract

PURPOSE:To eliminate the need for the control of an inherent key at the time of production of receiver and to reduce costs at the time of mass-production by constituting a part of a receiver so as to be detachable from a receiver main body. CONSTITUTION:First and second decoders and first and second memories are housed in a device 30 which is easily detachable from the pay television receiver main body. A first decoder 5 decodes an enciphered common key 17 by using an inherent key 18. A second memory 7 stores an enciphered common key 19, and a second decoder 4 decodes an enciphered scramble key 15 by using the common key 19. Thus, in the production of the receiver, a block 30 can be separated, for the pay television receiving device other than the block 30, the inherent key is unnecessary to be controlled, and a manufacture of a broadcast enterpriser is sufficient to control only the block 30 consisting of an IC card, etc.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to pay TV receiving devices, and in particular, in pay TV using satellite broadcasting etc., viewing permission is granted to each receiving device (hereinafter referred to as addressing). ) key delivery,
The present invention relates to a pay television receiving device that multiplexes radio waves and delivers them.

(Prior Art) In pay television using satellite broadcasting, etc., there is a double key method shown in FIG. 2 as a method for performing addressing.

The left and right sides of the dotted line in the center are included in the transmitting device and the pay TV receiving device, respectively. A program signal (hereinafter abbreviated as program signal) such as video or audio is scrambled by a scramble key 112 in a scrambler lot. This scramble boundary 2 is
The encryptor 102 encrypts it using a common key 113, and the common key 113 is encrypted by the encryptor 103 for each pay television receiver, using a receiving device-specific key (hereinafter referred to as a unique key) stored in the memory 104. )+14. These scrambled program signal 121, encrypted scramble key 122, and encrypted common 1J1123 are multiplexed by transmission radio waves. Therefore, each pay television receiving device
Common key 123 encrypted with the corresponding unique key 114
In the decoder]07, the memory +
Common 11 due to the unique key 114 stored in 08
11:] cannot be used as a source.

Therefore, since the common key 113 cannot be used in the decoder 106 and the scramble key 112 cannot be obtained, the program signal 1 cannot be used in the descrambler +05.
11 cannot be obtained. Taking advantage of this fact, the sending side performs addressing by controlling the delivery of the common key +23 encrypted using the unique key +14.

Here, the common key +13 is updated at relatively long intervals, and even if the common key 113 is decrypted and becomes public knowledge, unauthorized viewing can be prevented by updating. However, since the common key 113 is encrypted with a unique key 114 that differs for each receiving device, it is necessary to perform delivery for each receiving device, and the delivery time increases in proportion to the number of receiving devices.

Conventionally, there is a device shown in FIG. 3 as a decryption device for the above-mentioned double-key pay TV receiving device.

Hereinafter, explanation will be given using the block diagram of a conventionally used pay TV receiving apparatus shown in FIG.

The received signal 11 is separated into a scrambled program signal 13, an encrypted scramble key and an encrypted common boundary in the multiplex decoder 1, and these two keys 14 are further separated in the multiplex decoder 1. 2 into a scramble key 15 encrypted and a common key 16 encrypted, and the common key 16 is separated into a unique key 18 stored in the first memory 6 in the first decoder 5. and stored in the second memory 7. The simultaneously encrypted scramble key 15 is stored in the second memory 7 by the second decryptor 4.
It is decoded using a common 1119 stored in .

The scrambled program signal 13 is decoded as a program signal 20 by the descrambler 9 using the decrypted scramble key 22 described above. Here, a block 40 surrounded by a broken line in the figure is provided with some kind of physical protection such as an integrated circuit, and the common key 19 and the unique! 918 is prevented from being read outside the receiving device.

(Problems to be Solved by the Invention) The conventional pay TV receiving device described above requires a subscriber who wants to use pay TV to use radio waves etc. to watch special programs even after installing the pay TV receiving device. I had to wait for the key to be delivered.

It is also possible to register a common key in a second memory etc. in advance during manufacturing, but it is necessary to update the common key of all receiving devices in stock each time the common key is updated. Yes, there was a cost problem.

Further, in the conventional pay TV receiving device, it is necessary to write a unique key at the time of manufacture, which requires management of the key at the time of manufacture and inventory, which is not originally necessary, which poses a problem in terms of cost.

An object of the present invention is to solve the above-mentioned problems and provide a pay television receiving device that is capable of addressing.

[Means to solve the problem]

The PayTeleG receiving device of the present invention uses a multiplexing decoder that separates a received signal into a scrambled program signal, an encrypted scramble key, and an encrypted common key, and a key unique to the receiving device. a first decryptor that decrypts the encrypted common key; a second decryptor that decrypts the encrypted scramble key using the decrypted common key; and the decrypted scramble key. a descrambler that descrambles the scrambled program signal using a first memory; a first memory that stores a key unique to the receiving device; and a second memory that stores the decrypted common key. At least the first. a second decoder and a first decoder; a second memory, a first memory that is easily attachable and detachable to the main body of the pay TV receiving device;
It is housed in one device.

[Effect]

For manufacturers of pay TV receiving devices, the present invention eliminates the need to record a common key in memory.
Free yourself from the hassle of management. Furthermore, although conventional pay TV receiving devices required writing a unique key into the first memory during manufacturing, this invention eliminates this need, and the device can be easily attached to and detached from the pay TV receiving device main body at the time of shipment. All you have to do is attach a first memory inside the device, write a unique key to it, and then attach it to the main body. Therefore, it is only necessary to manage this removable device, for example, a device constituted by a semiconductor integrated circuit or an IC card, so that it is possible to save management time and avoid an increase in cost.

(Example) Next, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a pay television receiving apparatus of the present invention.

This embodiment includes a multiplexing decoder 1.2, a selector 3, a first decoder 5, a second decoder 4, a first memory 6, a second memory 7, and a third It consists of a memory 8 and a descrambler 9.

The multiplex decoder 1 converts the received signal 11 into a scrambled program signal 13, an encrypted scramble key, and an encrypted common key (hereinafter referred to as scramble key etc.) 1
Separate into 4. The multiplex decoder 2 uses a scramble key etc. 1
4 into an encrypted scramble key 15 and an encrypted common key 16. The selector 3 uses an encrypted common key 16 obtained from the received signal and an encrypted common key 1 manually input from an external source, such as a database of a broadcasting station.
Select 2. The first memory 6 stores a unique wIl 18, and the first decryptor 5 uses the unique key 18 to
The encrypted common key 17 is decrypted. second memory 7
stores the decoded common w119 and sends it to the second decoder 4
is the encrypted scramble 1 using the common key 19
Decode l15. The descrambler 9 decodes the scrambled program signal 13 using the scramble key 22 to obtain a program signal 20. Further, the third memory 8 stores an identification code unique to the pay TV receiving device, and a table corresponding to the unique key and this identification code is stored in a database operated by the key manager on the transmitting side. It is registered. Here, a block 30 surrounded by a broken line in the figure is composed of an IC card or the like, and can be easily separated from the main body of the pay TV receiving apparatus.

The basic operation of descrambling the scrambled program signal 13 to obtain a normal program signal 20 is the same as that of the conventional technique. That is, the encrypted common key 17 obtained from the received signal 11 is decrypted using the unique key 18 and stored in the second memory 7. The encrypted scramble key 15 is decrypted by the second decryptor 4 using the common key 19. The program signal 20 is obtained using the scramble key 22 obtained in this manner.

Now, one of the main features of the present invention is that the block 10 is composed of an IC card or the like and can be easily separated from the main body of the pay TV receiving device. By doing so, the manufacturing of the receiving device can be carried out by separating the block 30, and there is no need to manage unique keys for pay TV receiving devices other than the block 30, and the manufacturer or broadcaster can This means that it is only necessary to manage the block 30 made up of IC cards and the like. Furthermore, in this embodiment, by providing the identification code 21 unique to the pay television receiving device, the encrypted common key 12 can be used from signals other than the received signal 11.
This makes it possible for external labor to be applied. This allows you to watch the program at the same time as signing the contract.

There are various possible ways to input the encrypted common key 12, but for example, when signing a pay TV reception contract, the key is input by referring to the identification code 21 using a data input/output device such as an IC card installed at a retail store. There are possible ways. In this case, it is assumed that a data person output device such as an IC card is connected online or offline to a database of a key administrator such as a broadcasting company. Here, the key administrator will know the corresponding unique key by determining it from the identification code 21, but the third memory 8 that stores the identification code 21 is stored in the magnetic strip on the rC card or It does not need to be an IC memory as long as it can store characters or bit strings, such as embossed recording.

Furthermore, although the block JO is configured with an IC card in the above-mentioned embodiment, it can be easily attached to and detached from the main body of the pay TV receiving device, and the internal data, especially the unique key 18 and the common key 19, can be easily transferred. It does not need to be an IC card as long as it has a structure that cannot be read externally.

Further, the range of the block 30 is at least the first through second decoders 5, 4, the first . If the second memory 6.7 is included, the embodiment described above does not apply.

(Effects of the Invention) As explained above, the present invention has a configuration in which a part of the receiving device is removably attached to the receiving device main body, thereby eliminating the need to manage unique keys during manufacturing of the receiving device, making it easy to mass-produce. This has the effect of reducing manufacturing costs.

Furthermore, if a common key encrypted from outside can be manually generated, those who wish to watch pay TV will be able to watch pay TV at the same time as signing a contract.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an embodiment of the pay TV receiving device of the present invention, Fig. 2 is a conceptual diagram of the conventional technology and the double key system adopted by the present invention, and Fig. 3 is a pay TV receiving device. FIG. 1 is a block diagram of a conventional example of a device. 1.2-...Multiplex decoder, 3...Selector, 4...
-Second decoder, 5...First decoder, 6...
First memory, 7... Second memory, 8... Third memory, 9°105... Descrambler, 11... Received signal, +2.16.17.123... Encryption 13, 121... Scrambled program signal, 14... Encrypted common key and encrypted scramble key, 15, 122... Encrypted scramble key. , 18
, 114--Key unique to receiving device (unique key), 19,
113...Common key, 20. II+...Program signal, 21...Identification code, 22.112...Scramble key, :]0.40...Block, 101
... Scrambler, 102, 103... Encryptor,
104.108...Memory, 106, 107...
decoder.

Claims (1)

[Claims] 1. A pay TV receiving device comprising: a multiplexing decoder that separates a received signal into a scrambled program signal, an encrypted scramble key, and an encrypted common key; a first decryptor that decrypts the encrypted common key using a device-specific key; and a second decryptor that decrypts the encrypted scramble key using the decrypted common key. , a descrambler that descrambles the scrambled program signal using the decrypted scrambling key; a first memory that stores a key specific to the receiving device; and a first memory that stores the decrypted common key. a second memory, at least the first and second decoders and the first and second memories are easily attachable and detachable to the main body of the pay TV receiving device;
Pay TV receiving equipment contained within one device.