CN101287274B - 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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- CN101287274B CN101287274B CN2007100738383A CN200710073838A CN101287274B CN 101287274 B CN101287274 B CN 101287274B CN 2007100738383 A CN2007100738383 A CN 2007100738383A CN 200710073838 A CN200710073838 A CN 200710073838A CN 101287274 B CN101287274 B CN 101287274B
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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, and during mobile communication mobile phone had been widely used in daily life and has learnt by people, people were through 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 through the safety problem that mobile communications network carries out voice communication.
GSM is the widest mobile communications network of present range of application; Like 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 through the blue-teeth data channel, external terminal security device is connected through the GSM travelling carriage of Bluetooth technology with support bluetooth data communication function, 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 through 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 present invention provides a kind of mobile communication voice encryption system, and its Cipher Strength is high, and 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 is high, and 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, speech coding decoder module, voice encryption deciphering module and the digital speech transmission channel communication module that connect successively; Said 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, and digital speech transmission channel communication module is used to transmit the speech data of both call sides, in the transmitting audio data process; Said speech coding decoder module will judge whether speech data is the quiet data frame, and the voice encryption deciphering module when the speech coding decoder module detects the quiet data frame slot, carries out algorithm and key is changed.
Said voice collecting playing module comprises recording unit and playback unit, through the recording unit speech data of gathering is write buffer memory on the one hand, and the data that aspect reads decoding are imported the playback unit and play, and are converted into digital information.
Said speech coding decoder module compresses/reduces through 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.
Said voice encryption deciphering module connects airtight mouthful speech data with transmission through the encipher interface reconciliation and carries out encryption and decryption, and when the speech coding decoder module detects the quiet data frame slot, carries out algorithm and key replacing.
The channel transmitting element of said digital speech transmission channel communication module through connecting successively, data link, channel transmitting element be to the voice data transmission of both call sides, and the digital speech transmission channel is a kind of in circuit switched data channel, GPRS channel or the radio channel.
Said speech coding decoder module compresses and reduction speech data through 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 encryption method is provided, and it may further comprise the steps:
Step 1, both call sides are created the digital speech transmission channel;
Step 2, collection speech data, coding also generates speech data frame and quiet data frame;
Step 3, speech data frame is encrypted, and when the quiet data frame 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 decipher, and when detecting the quiet data frame slot, carry out algorithm and key and change;
Step 6, decoding reduction are also play the speech data after deciphering.
In the said step 1, the calling party utilizes asymmetric arithmetic and known callee's certificate to consult initial voice encryption algorithm and key.
In the said step 2, speech data is converted into digital information, and relevant voice data and quiet data are generated speech data frame and quiet data frame.
When each digital speech transmission 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 through 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 pausing, carry out the algorithm and the key replacing of data encryption through quiet data frame (no speech data frame) time slot of voice communication; Can pass through in voice communication course, to adopt 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 Switched Data; Circuit switched data) the digital speech transmission channel is the example explanation, and following GSM-CSD abbreviates CSD as, and it comprises the voice collecting playing module 10 that connects successively; It gathers and plays the voice of both call sides through recording unit and playback unit; And be converted into digital information, and through the recording unit speech data of gathering being write buffer memory on the one hand, the data input playback unit that aspect reads decoding is play; Speech coding decoder module 20; It compresses/reduces through 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 through the encipher interface reconciliation and carries out encryption and decryption, and when speech coding decoder module 20 detects the quiet data frame slot, carries out algorithm and key replacing; CSD communication module 40, its CSD channel transmitting element through connecting successively, CSD data link, CSD channel transmitting element are to the voice data transmission of both call sides.
Please consult Fig. 2 in the lump; 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, the speech data of at first voice collecting playing module 10 being gathered is encoded, and judges 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 is then deciphered, 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.
Please consult Fig. 3 in the lump, 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 is broken off 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 convert the speech data of gathering into digital information;
Step 3, speech coding decoder 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 in the quiet data frame slot, carry out algorithm and key agreement and replacing;
Step 5, through the CSD communication module, utilize the CSD channel to carry out transfer of data;
Step 6, encrypt and decrypt module are deciphered receiving speech data frame, when detecting the quiet data frame slot, carry out algorithm and key agreement and replacing;
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 playing module will be decoded after reducing is played to speech ciphering equipment.
Be appreciated that the voice encryption deciphering module 30 of mobile communication voice encryption system of the present invention will repeat above step 3 to step 6, so guarantee both sides' key synchronization when each digital speech transmission channel is set up, thereby guarantee the data encryption property 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 like the quiet data frame slot of GPRS channel, radio channel etc.; In addition, also can adopt other data of quiet data frame slot transmission, to expand other application.
The above is merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention, all any modifications of within spirit of the present invention and principle, being made, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. mobile communication voice encryption system; Comprise the voice collecting playing module, speech coding decoder module, voice encryption deciphering module and the digital speech transmission channel communication module that connect successively; Said 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, and 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; Said speech coding decoder module will judge whether speech data is the quiet data frame, and the voice encryption deciphering module when the speech coding decoder module detects the quiet data frame slot, carries out algorithm and key is changed.
2. mobile communication voice encryption system as claimed in claim 1; It is characterized in that: said voice collecting playing module comprises recording unit and playback unit; Through 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: said speech coding decoder module compresses/reduces through 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: said voice encryption deciphering module connects airtight mouthful speech data with transmission through the encipher interface reconciliation and carries out encryption and decryption, and when the speech coding decoder module detects the quiet data frame slot, carries out algorithm and key replacing.
5. mobile communication voice encryption system as claimed in claim 1; It is characterized in that: the channel transmitting element of said digital speech transmission channel communication module through connecting successively, data link, channel transmitting element be to the voice data transmission of both call sides, and the digital speech transmission channel is a kind of in circuit switched data channel, GPRS channel or the radio channel.
6. mobile communication voice encryption system as claimed in claim 1 is characterized in that: said speech coding decoder module compresses and reduction speech data through linear prediction and the code book coding to voice.
7. mobile communication voice encryption method is characterized in that may further comprise the steps:
Step 1, both call sides are created the digital speech transmission channel;
Step 2, collection speech data, coding also generates speech data frame and quiet data frame;
Step 3, speech data frame is encrypted, and when the quiet data frame 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 decipher, and when detecting the quiet data frame slot, carry out algorithm and key and change;
Step 6, decoding reduction are also play the speech data after deciphering.
8. mobile communication voice encryption method as claimed in claim 7 is characterized in that: in the said 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 is characterized in that: in the said step 2, speech data is converted into digital information, and relevant voice 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 digital speech transmission channel was set up, repeating said steps three guaranteed both sides' key synchronization to step 5.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007100738383A CN101287274B (en) | 2007-04-11 | 2007-04-11 | Voice encryption system for mobile communication and encryption method thereof |
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| CN2007100738383A CN101287274B (en) | 2007-04-11 | 2007-04-11 | Voice encryption system for mobile communication and encryption method thereof |
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| CN101287274A CN101287274A (en) | 2008-10-15 |
| CN101287274B true CN101287274B (en) | 2012-07-04 |
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Families Citing this family (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 |
| CN102737639B (en) * | 2012-07-13 | 2014-05-28 | 北京理工大学 | Safety communication method for voice information |
| CN104486503B (en) * | 2014-12-16 | 2016-04-13 | 努比亚技术有限公司 | A kind of method of mobile terminal and voice encryption 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 |
| 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 |
| 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 |
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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 |
| CN1756127A (en) * | 2004-09-30 | 2006-04-05 | 北京信威通信技术股份有限公司 | Non-continuous full rate voice transmitting method in SCDMA system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN1756127A (en) * | 2004-09-30 | 2006-04-05 | 北京信威通信技术股份有限公司 | Non-continuous full rate voice transmitting method in SCDMA system |
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