CN101287274A - Voice encryption system for mobile communication and encryption method thereof - Google Patents
Voice encryption system for mobile communication and encryption method thereof Download PDFInfo
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- CN101287274A CN101287274A CNA2007100738383A CN200710073838A CN101287274A CN 101287274 A CN101287274 A CN 101287274A CN A2007100738383 A CNA2007100738383 A CN A2007100738383A CN 200710073838 A CN200710073838 A CN 200710073838A CN 101287274 A CN101287274 A CN 101287274A
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Abstract
The invention relates to a mobile communication voice encryption system and an encryption method thereof, wherein, the mobile communication voice encryption system comprises a voice collection and playing module, a voice encoding and decoding module, a voice encryption and decryption module and a digital voice transferring channel communication module; the encryption method includes that: the voice collection and playing module collects and plays voice of both sides in the communication by telephone; the voice encoding and decoding module compresses/restores data of the collected/ played voice and judges whether the data is a mute data frame or not; the voice encryption and decryption module encrypts and decrypts the transferred voice data and carries out the conversion of the algorithm and a secret key when the voice encoding and decoding module detects a mute data frame time slot; the digital voice transferring channel communication module transfers the voice data of both sides in the communication by telephone. Since the mobile communication voice encryption system and the encryption method of the invention adopt the mute data frame of a digital voice transferring channel to transfer the agreement algorithm and the conversion of the secret key, the synchronization of the algorithm and the conversion of the secret key as well as the safety of the voice communication can be ensured.
Description
Technical field
The present invention relates to a kind of mobile communication voice encryption system and encryption method thereof, relate in particular to a kind of mobile communication voice encryption system and encryption method thereof of the GSM of being applicable to mobile communications network.
Background technology
Along with science and technology development, communication science and technology is maked rapid progress, mobile communication mobile phone is widely used in daily life and the study by people, people are by mobile communication mobile phone and Internet phone-calling or the breath of sending short messages mutually, people's distance has each other greatly not only furthered, the contact and the information interchange of returning people bring great convenience, and therefore, people are most important by the safety problem that mobile communications network carries out voice communication.
GSM is the widest mobile communications network of present range of application, as a kind of mobile phone speech of China's No. 200410021688.8 patent application announcement and the End to End Encryption method of data, when travelling carriage and travelling carriage carry out voice, after the external terminal security device of the voice/data information via that transmitting terminal sends carries out speech coding and encryption, send to the bluetooth travelling carriage of transmitting terminal by the blue-teeth data channel, external terminal security device is connected with the GSM travelling carriage of supporting the bluetooth data communication function by Bluetooth technology, realizes the encryption of GSM network voice and data service.Yet above-mentioned existing GSM voice communication encryption technology is carried out speech coding and encryption by external terminal security device, and the Cipher Strength of this kind method is lower, is difficult to guarantee the safety of voice communication.
Summary of the invention
In order to overcome the existing problem that mobile communication voice encryption technology Cipher Strength is lower, fail safe is high and not enough, the invention provides a kind of mobile communication voice encryption system, its Cipher Strength height, fail safe is better.
The further technical problem to be solved of the present invention is: a kind of mobile communication voice encryption method is provided, and its Cipher Strength height, fail safe is better.
For solving the problems of the technologies described above, the present invention adopts following technical scheme: a kind of mobile communication voice encryption system is provided, comprise the voice collecting playing module that connects successively, the speech coding decoder module, voice encryption deciphering module and digital speech transmission channel communication module, described voice collecting playing module is used to gather and play the speech data of both call sides, the speech data that the speech coding decoder module will be gathered/play compresses/reduces, the voice encryption deciphering module carries out encryption and decryption to the speech data of transmission, digital speech transmission channel communication module is used to transmit the speech data of both call sides, in the transmitting audio data process, described speech coding decoder module will judge whether speech data is the quiet data frame, and the voice encryption deciphering module carries out algorithm when the speech coding decoder module detects the quiet data frame slot and key is changed.
Described voice collecting playing module comprises recording unit and playback unit, by the recording unit speech data of gathering is write buffer memory on the one hand, and the data input playback unit that aspect reads decoding is play, and is converted into digital information.
Described speech coding decoder module compresses/reduces by voice compression coding unit and the tone decoding unit speech data to collection/broadcast, and judges it is speech data frame or quiet data frame.
Described voice encryption deciphering module connects airtight mouthful speech data with transmission by the encipher interface reconciliation and carries out encryption and decryption, and carries out algorithm and key replacing when the encoding and decoding module detects the quiet data frame slot.
The channel transmitting element of described digital speech transmission channel communication module by connecting successively, data link, channel transmitting element be to the voice data transmission of both call sides, and described digital speech transmission channel is a kind of in CSD, GPRS or the radio.
Described speech coding and decoder module compress and reduction speech data by linear prediction and the code book coding to voice.
In order to solve further technical problem, the present invention adopts following another kind of technical scheme: a kind of mobile communication voice encrypting method is provided, and it may further comprise the steps:
Step 1, both call sides are created digital speech transport communication passage;
The speech data of step 2, collection, coding also generates speech data and quiet data;
Step 3, speech data is encrypted, and when the quiet data time slot, carried out algorithm and key is changed;
Step 4, utilize the digital speech transmission channel to carry out transfer of data;
Step 5, will receive speech data and be decrypted, and when detecting the quiet data time slot, carry out algorithm and key and change;
Speech data after step 6, decoding reduction and the broadcast deciphering.
In the described step 1, the calling party utilizes asymmetric arithmetic and known callee's certificate to consult initial voice encryption algorithm and key.
In the described step 2, speech data is converted into digital information, and corresponding speech data and quiet data are generated speech data frame and quiet data frame.
When each voice communication channel was set up, repeating said steps three guaranteed both sides' key synchronization to step 5.
Beneficial effect of the present invention is: because mobile communication voice encryption system of the present invention and encryption method thereof adopt the quiet data frame transmission negotiation algorithm of digital speech transmission channel and the replacing of key, it is synchronous to guarantee that algorithm and key are changed, and guarantees the fail safe of voice communication.
Description of drawings
Fig. 1 is the principle schematic of mobile communication voice encryption system of the present invention and encryption method thereof;
Fig. 2 is the encoding and decoding of mobile communication voice encryption method of the present invention and the workflow diagram of encrypt and decrypt;
Fig. 3 is the workflow diagram of the CSD digital speech transmission channel communication module of mobile communication voice encryption system of the present invention.
Embodiment
Because existing when conversation, people pause, mobile communication voice encryption system of the present invention and encryption method thereof are carried out algorithm and the key replacing that voice communication data is encrypted by quiet data frame (SID frame) time slot that utilizes the voice communication of digital speech transmission channel, to improve the confidentiality and the reliability of voice encryption, promptly when algorithm and the key replacing of when pausing, carrying out data encryption by quiet data frame (no speech data frame) time slot of voice communication, can be by in voice communication course, adopting revocable algorithm and fixing secret key encryption, thereby further improve the confidentiality and the reliability of voice communication, its difficulty is cracked.
See also Fig. 1, present embodiment mobile communication voice encryption system is with GSM-CSD (Circuit SwitchedData, circuit switched data) the digital speech transmission channel is the example explanation, it comprises the voice collecting playing module 10 that connects successively, it gathers and plays the voice of both call sides by recording unit and playback unit, and be converted into digital information, on the one hand by the recording unit speech data of gathering is write buffer memory, the data input playback unit that aspect reads decoding is play; Speech coding decoder module 20, it compresses/reduces by voice compression coding unit and the tone decoding unit speech data to collection/broadcast, and judging whether to be the quiet data frame, the present embodiment utilization is compressed and reduction speech data the linear prediction and the code book coding of voice; Voice encryption deciphering module 30, it connects airtight mouthful speech data with transmission by the encipher interface reconciliation and carries out encryption and decryption, and carries out algorithm and key replacing when the encoding and decoding module detects the quiet data frame slot; CSD communication module 40, its CSD channel transmitting element by connecting successively, CSD data link, CSD channel transmitting element are to the voice data transmission of both call sides.
See also Fig. 2, when the speech coding decoder module 20 of mobile communication voice encryption system of the present invention and 30 work of voice encryption deciphering module, at first the speech data that voice collecting playing module 10 is gathered is encoded, and judge that it is speech data frame slot or quiet data frame slot, if speech data frame slot, then encrypt, if the quiet data frame slot, then negotiation algorithm and key are changed; After the transmission of CSD data link, again the speech data that receives is judged that if the speech data frame slot then is decrypted, if the quiet data frame slot, then negotiation algorithm and key are changed.Be appreciated that if key updating failure in the above-mentioned steps is then returned the renewal failure and required to retransmit.
See also Fig. 3, during 40 work of the CSD communication module of mobile communication voice encryption system of the present invention, initialization line facility at first; According to calling party/callee's calling/answerphone; Connect; Receive and the transmission data, carry out transfer of data; Shut-down circuit disconnects connection; Discharge resource; Finish.
In sum, be appreciated that mobile communication voice encryption method of the present invention specifically may further comprise the steps:
Step 1, both call sides are created the CSD communication port, and the calling party utilizes asymmetric arithmetic and known callee's certificate to consult initial voice encryption algorithm and key;
Step 2, voice collecting playing module are converted to digital information with the speech data of gathering;
Step 3, encoding and decoding module are encoded to the digital information of gathering, and generate speech data frame and quiet data frame;
Step 4, encrypt and decrypt module are encrypted speech data frame, and carry out algorithm and key agreement and replacing in the quiet data frame slot;
Step 5, by the CSD communication module, utilize the GSM-CSD channel to carry out transfer of data;
Step 6, encrypt and decrypt module are decrypted receiving speech data frame, carry out algorithm and key agreement and replacing when detecting the quiet data frame;
The reduction of decoding of step 7, the coding and decoding module speech data after to deciphering;
The speech data that step 8, voice collecting and playing module will be decoded after reducing is played to speech ciphering equipment.
Be appreciated that when each voice communication channel is set up, the voice encryption deciphering module 20 of mobile communication voice encryption system of the present invention will repeat above step 3 to step 6, so guarantee both sides' key synchronization, thereby guarantee the data encryption of conversation; Secondly, mobile communication voice encryption system of the present invention and encryption method thereof also can adopt other digital speech transmission channels, encrypt as the quiet data frame slot of GPRS, radio etc.; In addition, also can adopt the quiet data frame slot to transmit other data, to expand other application.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention, all any modifications of being made within the spirit and principles in the present invention, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1, a kind of mobile communication voice encryption system, comprise the voice collecting playing module that connects successively, the speech coding decoder module, voice encryption deciphering module and digital speech transmission channel communication module, described voice collecting playing module is used to gather and play the speech data of both call sides, the speech data that the speech coding decoder module will be gathered/play compresses/reduces, the voice encryption deciphering module carries out encryption and decryption to the speech data of transmission, digital speech transmission channel communication module is used to transmit the speech data of both call sides, it is characterized in that: in the transmitting audio data process, described speech coding decoder module will judge whether speech data is the quiet data frame, and the voice encryption deciphering module carries out algorithm when the speech coding decoder module detects the quiet data frame slot and key is changed.
2, mobile communication voice encryption system as claimed in claim 1, it is characterized in that: described voice collecting playing module comprises recording unit and playback unit, by the recording unit speech data of gathering is write buffer memory on the one hand, aspect reads the data input playback unit of decoding and plays, and is converted into digital information.
3, mobile communication voice encryption system as claimed in claim 1, it is characterized in that: described speech coding decoder module compresses/reduces by voice compression coding unit and the tone decoding unit speech data to collection/broadcast, and judges it is speech data frame or quiet data frame.
4, mobile communication voice encryption system as claimed in claim 1, it is characterized in that: described voice encryption deciphering module connects airtight mouthful speech data with transmission by the encipher interface reconciliation and carries out encryption and decryption, and carries out algorithm and key replacing when the encoding and decoding module detects the quiet data frame slot.
5, mobile communication voice encryption system as claimed in claim 1, it is characterized in that: the channel transmitting element of described digital speech transmission channel communication module by connecting successively, data link, channel transmitting element be to the voice data transmission of both call sides, and described digital speech transmission channel is a kind of in CSD, GPRS or the radio.
6, mobile communication voice encryption system as claimed in claim 1 is characterized in that: described speech coding and decoder module compress and reduction speech data by linear prediction and the code book coding to voice.
7, a kind of mobile communication voice encrypting method is characterized in that may further comprise the steps:
Step 1, both call sides are created digital speech transport communication passage;
The speech data of step 2, collection, coding also generates speech data and quiet data;
Step 3, speech data is encrypted, and when the quiet data time slot, carried out algorithm and key is changed;
Step 4, utilize the digital speech transmission channel to carry out transfer of data;
Step 5, will receive speech data and be decrypted, and when detecting the quiet data time slot, carry out algorithm and key and change;
Speech data after step 6, decoding reduction and the broadcast deciphering.
8, mobile communication voice encryption method as claimed in claim 7 is characterized in that: in the described step 1, the calling party utilizes asymmetric arithmetic and known callee's certificate to consult initial voice encryption algorithm and key.
9, mobile communication voice encryption method as claimed in claim 7, it is characterized in that: in the described step 2, speech data is converted into digital information, and corresponding speech data and quiet data are generated speech data frame and quiet data frame.
10, mobile communication voice encryption method as claimed in claim 7 is characterized in that: when each voice communication channel was set up, repeating said steps three guaranteed both sides' key synchronization to step 5.
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Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
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CN102307075A (en) * | 2011-08-09 | 2012-01-04 | 深圳科立讯电子有限公司 | Voice transmission encryption method of DMR (digital mobile radio) communication terminal |
CN102737639A (en) * | 2012-07-13 | 2012-10-17 | 北京理工大学 | Safety communication method for voice information |
CN104486503A (en) * | 2014-12-16 | 2015-04-01 | 深圳市中兴移动通信有限公司 | Mobile terminal and voice encryption method thereof |
CN106470202A (en) * | 2015-08-21 | 2017-03-01 | 成都鼎桥通信技术有限公司 | The method of terminal speech encryption and terminal in the Cluster Multimedia system of broadband |
CN106790281A (en) * | 2017-02-23 | 2017-05-31 | 深圳市沃阳精密科技有限公司 | A kind of end-to-end voice encryption device and encryption method towards intercom system |
CN108075891A (en) * | 2018-02-02 | 2018-05-25 | 成都动视时代科技有限公司 | A kind of conference system based on digital voice encryption |
CN108243161A (en) * | 2016-12-26 | 2018-07-03 | 北京润信恒达科技有限公司 | A kind of terminal speech encryption method and voice encryption system |
CN108337080A (en) * | 2018-02-02 | 2018-07-27 | 成都动视时代科技有限公司 | A kind of virtual reality system of information security environment |
Family Cites Families (3)
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US6223154B1 (en) * | 1998-07-31 | 2001-04-24 | Motorola, Inc. | Using vocoded parameters in a staggered average to provide speakerphone operation based on enhanced speech activity thresholds |
CN1592141A (en) * | 2004-01-17 | 2005-03-09 | 中国电子科技集团公司第三十研究所 | Terminal to terminal encryption method of cell phone voice and data |
CN100369444C (en) * | 2004-09-30 | 2008-02-13 | 北京信威通信技术股份有限公司 | Non-continuous full rate voice transmitting method in SCDMA system |
-
2007
- 2007-04-11 CN CN2007100738383A patent/CN101287274B/en not_active Expired - Fee Related
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102307075A (en) * | 2011-08-09 | 2012-01-04 | 深圳科立讯电子有限公司 | Voice transmission encryption method of DMR (digital mobile radio) communication terminal |
CN102737639A (en) * | 2012-07-13 | 2012-10-17 | 北京理工大学 | Safety communication method for voice information |
CN104486503A (en) * | 2014-12-16 | 2015-04-01 | 深圳市中兴移动通信有限公司 | Mobile terminal and voice encryption method thereof |
CN106470202A (en) * | 2015-08-21 | 2017-03-01 | 成都鼎桥通信技术有限公司 | The method of terminal speech encryption and terminal in the Cluster Multimedia system of broadband |
CN108243161A (en) * | 2016-12-26 | 2018-07-03 | 北京润信恒达科技有限公司 | A kind of terminal speech encryption method and voice encryption system |
CN106790281A (en) * | 2017-02-23 | 2017-05-31 | 深圳市沃阳精密科技有限公司 | A kind of end-to-end voice encryption device and encryption method towards intercom system |
CN108075891A (en) * | 2018-02-02 | 2018-05-25 | 成都动视时代科技有限公司 | A kind of conference system based on digital voice encryption |
CN108337080A (en) * | 2018-02-02 | 2018-07-27 | 成都动视时代科技有限公司 | A kind of virtual reality system of information security environment |
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