CN1764109A - Protection method for wireless data receive and delivery and receive and delivery device - Google Patents
Protection method for wireless data receive and delivery and receive and delivery device Download PDFInfo
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- CN1764109A CN1764109A CN 200410050647 CN200410050647A CN1764109A CN 1764109 A CN1764109 A CN 1764109A CN 200410050647 CN200410050647 CN 200410050647 CN 200410050647 A CN200410050647 A CN 200410050647A CN 1764109 A CN1764109 A CN 1764109A
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Abstract
The invention relates to a protection method for wireless data receive and send, which comprises: enciphering the data key; loading the enciphered data into the first data information packet; enciphering the being send data by the data key; wireless sending the data from the second packet; decoding the enciphered data key; decoding the packet from the second with key. Wherein the send device comprises: a random number generator, a data key encipher module, an encipher module, a wireless receive and code device; while the receive device comprises: a wireless receive and decode device, and a decode module to decode the data key and received data.
Description
Technical field
The present invention relates to a kind of wireless data and receive and send the guard method of usefulness and receive and send device, especially relate to a kind of wireless data tranmission techniques, guard method and device that wireless data transmits by WLAN (wireless local area network).
Background technology
In recent years, along with increase, utilize the development that also constantly shoots ahead of the data transferring technique of WLAN (wireless local area network) to the user of radio network technique.Especially the radio network technique standard is along with bringing up to the IEEE802.11a standard from WLAN standard IEEE802.11b, and the transfer rate of data is also brought up to 54Mbps from 11Mbps.Therefore, along with the raising of this rate of data signalling, receive and send audiovisual AV data by WLAN (wireless local area network) and also become a reality.
Usually; for passing through wireless local network transmission audiovisual AV data; not only broadcasting in real time needs the transfer rate of wide region; and can not interrupt images picture (frame) sequence; for this reason, when needing to guarantee the service behaviour index (Quality Of Service is hereinafter to be referred as QOS) of transmission, need also to guarantee that the audiovisual AV data that produce can only be sent on the receiver of regulation in specific medium; so, the fail safe in the data transfer procedure that also needs protection.
To the requirement of the wide region of transfer rate, progressively standardization and practicability along with to the WLAN standard IEEE 802.11b of the WLAN standard IEEE802.11a of 5.2Ghz frequency band and 2.4Ghz frequency band can realize the requirement of wide region transfer rate.To the requirement of service behaviour index (service quality), current trend is to carry out the regulation of WLAN standard IEEE 802.11e and IEEE 802.11h.
Fig. 1 is that the general wireless local network transmission audiovisual AV data sending device that passes through constitutes block diagram.As shown in the figure, 100 pairs of dispensing devices of the central processing unit CPU of dispensing device are controlled comprehensively.And, video format converter 102 passes through the video data of the control of central processing unit CPU 100 with diversified form, be Composite Video Broadcast Signal CVBS, red-green-blue RGB, the video data of color difference components YPbPr is transformed to digital video standard ITU-R 656 forms as mpeg standard decoder 104 pattern of the inputs line by line.And mpeg standard decoder 104 will have the video data of digital video standard ITU-R 656 forms, be transformed to the transmission stream TS (Transport Stream) of mpeg standard after deciphering by mpeg standard.Here, above-mentioned mpeg standard decoder 104 will have on the time and space redundant data (Redundant Data) of repeatability eliminate, therefore, effective packed data.
The output of mpeg standard decoder 104 offers medium access (visit) control mac processor 106; and medium access (visit) control mac processor 106 is in LAN environment; not only provide multimedia visit; the access of network, authentication and safety protection function; and, the transmission of mpeg standard stream TS is decoded as the frame of medium access (visit) control MAC and the frame that medium access (visit) is controlled MAC is transmitted by network.Baseband (base band) handling part 108 also is called physical layer protocol sublayer PHY (layer), it is modulated to the state that is suitable for wireless transmission with the frame of medium access (visit) the control MAC of medium access (visit) control mac processor 106 outputs, and inserts the modulation that synchronizing signal etc. is carried out for the reality transmission for the synchronization during guaranteeing to receive and send.Radio frequency module 110 is modulated to the output signal of baseband handling part 108 wireless signal and passes through antenna 112 transmissions.
Then, with reference to Fig. 2 the reception course of work of receiving system is described as follows: the radio frequency module 202 of receiving system is passed through the wireless signal that antenna 200 transmission and reception apparatus send, and the received signal recovery is baseband (base band) signal; And the baseband signal that restores offers baseband handling part 204.Baseband handling part 204 is the frame of medium access (visit) control MAC with the baseband signal restoring and offers medium access (visit) control mac processor 206.And offer mpeg standard decoder 208 after the transmission stream TS of frame recovery for mpeg standard of medium access (visit) control mac processor 206 with medium access (visit) control MAC.And mpeg standard decoder 208 offers video format transformation component 210 after the transmission of mpeg standard stream TS is transformed to the video data with digital video standard ITU-R 656 forms.
Video format transformation component 210 will have the video data of digital video standard ITU-R 656 forms, for example: Composite Video Broadcast Signal CVBS, red-green-blue RGB, export after some among the color difference components YpbPr is transformed to specific format line by line.Then, central processing unit CPU 212 is controlled receiving system comprehensively.
Then, with reference to Fig. 3 the data by WLAN (wireless local area network) are sent and the simple explanation of method for security protection of receiving system.
1. client as request authentication goes up request authentication at access point (Access Point), then on access point 2. the random request text (random challenge text) that authenticates is offered the client.3. the client offers access point again behind the random request text encryption.
Above-mentioned encryption is based on compunication cryptographic algorithm RC4 realization.The data that need when utilizing compunication cryptographic algorithm RC4 to encrypt are by the generation that combines of the enciphered data (authenticationkey) of prior appointment and initial vector (Initial Vector).And enciphered data key and initial vector are that access point and access point provide all clients of service to share.
Access point is after the request text of having encrypted is decoded, and confirms whether decoding back random request text is consistent with the request text of prior input, and 4. the authentication result of confirming is sent to the client.
With reference to Fig. 4 and Fig. 5 the coding and the decode procedure of asking text further described.Fig. 4 and Fig. 5 are wired equivalent privacy WEP (Wired Equivalent Privacy) algorithm flows; And wired equivalent privacy WEP algorithm is the safeguard protection algorithm that uses in the IEEE 802.11 of WLAN standard specification.
With reference to Fig. 4 above-mentioned ciphering process is described as follows:
At first, client's concatenation operation device (Concatenat ion Operator) 300 is with link to each other with the enciphered data key laggard row operation and produce seed (seed) data of initial vector.Here, initial vector and enciphered data key are to send and receive two parts to share.Critical data is input to random digit generator (Pseudo Random Number Generator) 302; And random digit generator 302 will utilize seed data to produce data key sequences (Key Sequence).
Then, client's cyclic redundancy check (CRC) code CRC algorithm portion 306 will produce reliable test value ICV (Integrity checkValue) after will carrying out the processing of cyclic redundancy check (CRC) code CRC check to the random request text.
Above-mentioned reliable test value ICV, random request text, data key sequence are input to XOR XOR circuit 304; XOR XOR circuit 304 is carried out XOR XOR with reliable test value ICV, random request text, data key sequence, and the XOR result is exported as the random request text of encrypting.
With reference to Fig. 5 access point is described as follows the random request text decode procedure of having encrypted that the client provides:
Computing client's concatenation operation device 400 links to each other initial vector with the enciphered data key after, and produce seed (seed) data.
Seed data is input to random digit generator 402, and random digit generator 402 will utilize seed data to produce data key sequence.Here the data key sequence of Chan Shenging has identical data with data key sequence in Fig. 4.
Data key sequence and the random request text encrypted are input to XOR XOR circuit 404; And random request text that 404 pairs of XOR XOR circuit have been encrypted and data key sequence are carried out XOR XOR again, and thus the text recovery of encrypting are reliable test value ICV and random request text.
The random request text is input to cyclic redundancy check (CRC) code CRC algorithm portion 406, and 406 pairs of random request texts of cyclic redundancy check (CRC) code CRC algorithm portion carry out the cyclic redundancy check (CRC) code CRC check to be handled, and produces reliable test value ICV.The test value ICV of cyclic redundancy check (CRC) code CRC algorithm portion 406 outputs and the reliable test value ICV that decodes from the random request text of having encrypted compare, thereby finish the authentication to respective client.
Above-mentioned wired equivalent privacy WEP algorithm be in conventional art not to transmitting the algorithm that data self are protected, but whether the visit that determines each client is allowed and the algorithm protected.Therefore, this algorithm exists the transmission of the data between each client who belongs to same access point, can not guarantee its safety issue.
Summary of the invention
The present invention develops for solving above-mentioned existing problem, its objective is to provide to belong to same access point, and the data between each client are transmitted, and can guarantee that its safe wireless data receives and sends the guard method of usefulness and receives and sends device.
The guard method that wireless data of the present invention receives and sends is made up of the following stage: utilize the identifying information of dispensing device and receiving system to carry out the encryption stage to the data key that produces at random; Ciphered data key is loaded in transmission stage after the 1st data message wrapped; The data of utilizing the data key will need to send are carried out the encryption stage; Ciphered data is unwrapped wireless transfer phase of beginning from the 2nd data message; In the data packets of wireless transmission, utilize the identifying information of dispensing device and receiving system, the 1st data message wrapped the decode phase of the key of ciphered data of loading; Utilize decoded data key, unwrap the beginning from the 2nd data message the data that receive are carried out decode phase.
The encryption stage of described data key is that data key and identifying information carry out stage of forming behind the XOR; The encryption of data is that data and above-mentioned data key are carried out stage of forming behind the XOR.
The decode phase of described encrypted data key is that ciphered data key and identifying information are carried out stage of forming behind the XOR; The decoding of encrypted data is that ciphered data and above-mentioned data key are carried out stage of forming behind the XOR.
Wireless data of the present invention receives and sends the dispensing device of usefulness, is made of following part: the random digit generating unit that produces the data key at random; Utilize the data key encrypting module of the identifying information enciphered data key of dispensing device and receiving system; The data message that ciphered data key is loaded in the 1st transmission is wrapped, and is loaded in the encrypting module of the 2nd data packets after the data encryption that utilizes above-mentioned data key to send; The decoding and the wireless transmission part of carrying out wireless transmission after the data packets decoding to encrypting module output.
Described data key encrypting module is made of following part: with the concatenation operation device of the identifying information concatenation operation of dispensing device and receiving system; The output of concatenation operation device and above-mentioned data key carried out the encrypting module encrypted behind the XOR.
Described encrypting module is made of following part: with the data key with sent data and carry out the compact part that adds encrypted behind the XOR; During beginning to transmit a data packets from the transmission of data, produce the packets of information timer of asserts signal; Ciphered data key and ciphered data are provided, and during producing asserts signal, export ciphered data key, and the multiplexer of output encrypted data.
Wireless data of the present invention receives and sends the receiving system of usefulness, is made of following part: to the data packets reception of wireless transmission and the wireless receiving and the decoder of decoding; Utilize the identifying information of dispensing device and receiving system, in the data packets that has received, unwrap the beginning from the 1st data message, the data key is decoded and utilize decoded data key, unwrap the beginning, utilize data key decoding module from the 2nd data message.
Described decoder module is made of following part: from producing the packets of information timer of asserts signal during the reception of data begins to transmit a data packets; Concatenation operation device with the identifying information concatenation operation of dispensing device and receiving system; The output of concatenation operation device and the 1st data packets are carried out XOR and the data key is decoded, the lsb decoder of data being decoded after in the 2nd data packets, the data packets of decoded data key and reception being carried out XOR; Providing of decoded data key and concatenation operation device output is provided, and during asserts signal produces, the output of concatenation operation device offered lsb decoder, and with the multiplexer of data key output.
Advantage of the present invention and effect are as follows:
As described above, the present invention is by dispensing device and receiving system identifier ID enciphered data key, and the 1st data packets is provided, and then, the data that transmit decoded by the data key.Thus, the present invention is except that the dispensing device and receiving system of appointment, and corresponding data can not be decoded, and therefore, has the advantage that can guarantee two transmission data securities between the device.
Description of drawings
Fig. 1 is that the dispensing device of wireless data constitutes block diagram.
Fig. 2 is that the receiving system of wireless data constitutes block diagram.
Fig. 3 is the flow chart of conventional cryptography method.
Fig. 4 and Fig. 5 are wired equivalent privacy WEP algorithm flow charts.
Fig. 6 is the formation block diagram of dispensing device of the present invention.
Fig. 7 is the formation block diagram of the data key encrypting module of Fig. 6.
Fig. 8 is the formation block diagram of the encrypting module of Fig. 6.
Fig. 9 is the formation block diagram of receiving system of the present invention.
Figure 10 is the formation block diagram of the decoder module of Fig. 9.
Accompanying drawing major part symbol description:
500: central processing unit CPU 502: format converter
504: encrypting module 506:MPEG standard decoder
508: medium access (visit) control mac processor
510: baseband (base band) processor
512: radio frequency module 514: antenna
516: random digit generator 600: antenna
602: radio frequency module 604: the baseband processor
606: medium access (visit) control mac processor 608:MPEG standard decoder
610: decoder module 612: format converter
Embodiment
With reference to Fig. 6 the dispensing device of exemplary embodiments of the present invention is described.
500 pairs of dispensing devices of the central processing unit CPU of dispensing device are controlled comprehensively.The audiovisual AV data conversion that format conversion portion 502 will have a diversified form is the audiovisual AV data of the specific format deciphered by mpeg standard, and the audiovisual AV data of conversion are offered encrypting module 504; And during central processing unit CPU 500 provided the transmission commencing signal, audiovisual AV data did not offer encrypting module 504.
The random digit generating unit 516 data key (KEY) that generation is encrypted and decoding needs also offers data key encrypting module 518 and encrypting module 504.Then, the data key sequence that data key encrypting module 518 will produce source identifier ID and object identifier ID and 516 outputs of random digit generating unit is carried out the data key sequence of integrated encode, and the data key sequence that produces is offered encrypting module 504.Above-mentioned here source identifier is the identifying information that sends part, and object identifier ID is the identifying information of receiving unit.
Data key encrypting module 518 reception sources identifier IDs and object identifier ID input is also carried out concatenation operation and is produced data key sequence, and the data key sequence that produces and above-mentioned data key are carried out XOR XOR generates ciphered data key.The ciphered data key is input to encrypting module 504.
Here, with reference to Fig. 7 the formation of data key encrypting module 518 is further described.Data key encrypting module 518 is to be made of concatenation operation device 520 and XOR XOR circuit 522.
Encrypting module 504 if central processing unit CPU 500 provides proceed-to-send signal, then during a data packets sends, is exported ciphered data key; Then, output after the audiovisual AV data of utilizing the data key that format converter 502 is provided are decoded.That is, encrypting module 504 is loaded as the key of ciphered data that the audiovisual AV data of having encrypted in the 1st data packets are decoded, and in the time of then to its transmission, exports after the encryption audiovisual AV data.
Here, with reference to Fig. 8 the formation of encrypting module 504 is elaborated.
Encrypting module 504 is to be made of XOR XOR circuit 522, multiplexer 526, packets of information timer 528.The proceed-to-send signal that packets of information timer 528 will provide according to central processing unit CPU 500, during sending a data packets, asserts signal " 1 " offers multiplexer 526.XOR XOR circuit 522 is carried out audiovisual AV data and data key XOR XOR and is offered multiplexer 526 by the audio-visual data that the XOR XOR circuit will have been encrypted.Multiplexer 526 is exported ciphered data key during packets of information timer 528 provides asserts signal.During not providing asserts signal, the audiovisual AV data that output has been encrypted.
The output of encrypting module 504 is input to mpeg standard decoder 506; And mpeg standard decoder 506 is transformed to mpeg standard transmission stream MPEG TP after the output of encrypting module 504 is deciphered by mpeg standard.Mpeg standard transmits stream MPEG TS and carries out wireless transmission by medium access (visit) control mac processor 508, baseband handling part 510, radio frequency module 512, the antenna 514 with WLAN (wireless local area network) information storage medium card.Here the course of work to medium access (visit) control mac processor 508, baseband handling part 510, radio frequency module 512, antenna 514 etc. is identical with tradition, therefore, omits its detailed description.
Below, the method that the audiovisual AV data of having encrypted that transmission and reception apparatus is provided are restored describes.
At first, with reference to Fig. 9 the formation of the present invention typical case receiving system is described.
The antenna 600 of receiving system, radio frequency module 602, baseband handling part 604, medium access (visit) control mac processor 606 transmit stream (MPEG TS) with the mpeg standard of transmission and reception apparatus prosperity, and offer mpeg standard decoder 608.Here, identical to the course of work of antenna 600, radio frequency module 602, baseband handling part 604, medium access (visit) control mac processor 606 etc. with tradition, therefore, omit its detailed description.
Mpeg standard decoder 608 transmits mpeg standard and offers decoder module 610 after stream (MPEG TS) is deciphered by mpeg standard.And decoder module 610 is decoded the key of ciphered data that mpeg standard decoder 608 provides, and utilizes the data key of decoding, will export after the audiovisual AV data decode of having encrypted.
Here, with reference to Figure 10 the formation of decoder module 610 is described.
Then, packets of information timer 620 begins to produce the signal of reception as central processing unit CPU 614, then during transmitting a data packets, is provided as the asserts signal " 1 " of set multiplexer 618.Through anti-phase and clear signal offered multiplexer 618, and clock signal offers d type flip flop 626 to asserts signal by inverter 624.
Therefore, multiplexer 618 is during receiving first data packets, and the output of concatenation operation device 520 offers XOR XOR circuit 628.The output of the concatenation operation device 520 that XOR XOR circuit 628 provides by multiplexer 618 and first data packets of reception are carried out XOR XOR.Because first data packets is a ciphered data key, so the result of XOR XOR also is the data key.Above-mentioned data key offers d type flip flop 626; And d type flip flop 626 offers multiplexer 618 with the data key according to clock signal.
That is, since the data packets of the 1st reception, to the data key decode and with decoding the data key be input to multiplexer 618.During receiving first data packets, finish and be eliminated as multiplexer 618, then do not export the output of concatenation operation device 616, and export decoded data key.
Decoded audiovisual AV data offer format converter 612, and the form of format converter 612 response users' request carries out audiovisual AV data to export after the conversion.Then, 614 pairs of receiving systems of central processing unit CPU are controlled comprehensively, and therefore, the exemplary embodiments according to the present invention offers each one with signal and source identifier ID, the object identifier ID that begins to receive.
Claims (8)
1, a kind of wireless data receives and sends the guard method of usefulness, it is characterized in that, is made up of the following stage: utilize the identifying information of dispensing device and receiving system to encrypt the stage to the data key that produces at random; Ciphered data key is loaded in transmission stage after the 1st data message wrapped; The data of utilizing the data key will need to send are carried out the encryption stage; Ciphered data is unwrapped wireless transfer phase of beginning from the 2nd data message; In the data packets of wireless transmission, utilize the identifying information of dispensing device and receiving system, the key of ciphered data of the 1st data message being wrapped loading carries out decode phase; Utilize decoded data key, unwrap the beginning from the 2nd data message the data that receive are carried out decode phase.
2, receive and send the guard method of usefulness according to the described wireless data of claim 1, it is characterized in that: the encryption stage of described data key is that data key and identifying information carry out stage of forming behind the XOR; The encryption of data is that data and above-mentioned data key are carried out stage of forming behind the XOR.
3, receive and send the guard method of usefulness according to the described wireless data of claim 1, it is characterized in that: the decode phase of described encrypted data key is that ciphered data key and identifying information are carried out stage of forming behind the XOR; The decoding of encrypted data is that ciphered data and above-mentioned data key are carried out stage of forming behind the XOR.
4, a kind of wireless data receives and sends the dispensing device of usefulness, it is characterized in that, is made of following part: the random digit generating unit that produces the data key at random; Utilize the data key encrypting module of the identifying information enciphered data key of dispensing device and receiving system; The data message that ciphered data key is loaded in the 1st transmission is wrapped, and is loaded in the encrypting module of the 2nd data packets after the data encryption that utilizes above-mentioned data key to send; The decoding and the wireless transmission part of carrying out wireless transmission after the data packets decoding to encrypting module output.
5, receive and send the dispensing device of usefulness according to the described wireless data of claim 4, it is characterized in that, described data key encrypting module is made of following part: with the concatenation operation device of the identifying information concatenation operation of dispensing device and receiving system; The output of concatenation operation device and above-mentioned data key carried out the encrypting module encrypted behind the XOR.
6, receive and send the dispensing device of usefulness according to the described wireless data of claim 4, it is characterized in that, described encrypting module is made of following part: with the data key with sent data and carry out the compact part that adds encrypted behind the XOR; During beginning to transmit a data packets from the transmission of data, produce the packets of information timer of asserts signal; Ciphered data key and ciphered data are provided, and during producing asserts signal, export ciphered data key, and the multiplexer of output encrypted data.
7, a kind of wireless data receives and sends the receiving system of usefulness, it is characterized in that, is made of following part: to the data packets reception of wireless transmission and the wireless receiving and the decoder of decoding; Utilize the identifying information of dispensing device and receiving system, in the data packets that has received, unwrap the beginning from the 1st data message, the data key is decoded and utilized decoded data key, unwrap the beginning, utilize the data key to carry out decoding module from the 2nd data message.
8, receive and send the receiving system of usefulness according to the described wireless data of claim 7, it is characterized in that, described decoder module is made of following part: from producing the packets of information timer of asserts signal during the reception of data begins to transmit a data packets; Concatenation operation device with the identifying information concatenation operation of dispensing device and receiving system; The output of concatenation operation device and the 1st data packets are carried out XOR and the data key is decoded, the lsb decoder of data being decoded after in the 2nd data packets, the data packets of decoded data key and reception being carried out XOR; Providing of decoded data key and concatenation operation device output is provided, and during asserts signal produces, the output of concatenation operation device offered lsb decoder, and with the multiplexer of data key output.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200410050647 CN1764109A (en) | 2004-10-22 | 2004-10-22 | Protection method for wireless data receive and delivery and receive and delivery device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200410050647 CN1764109A (en) | 2004-10-22 | 2004-10-22 | Protection method for wireless data receive and delivery and receive and delivery device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102236607A (en) * | 2010-04-23 | 2011-11-09 | 国民技术股份有限公司 | Data security protection method and data security protection device |
| CN101479985B (en) * | 2006-06-29 | 2012-05-30 | 京瓷株式会社 | Content data, transmitter apparatus, receiver apparatus and decrypting method |
-
2004
- 2004-10-22 CN CN 200410050647 patent/CN1764109A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101479985B (en) * | 2006-06-29 | 2012-05-30 | 京瓷株式会社 | Content data, transmitter apparatus, receiver apparatus and decrypting method |
| CN102236607A (en) * | 2010-04-23 | 2011-11-09 | 国民技术股份有限公司 | Data security protection method and data security protection device |
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