CN104219213A - Android system oriented end-to-end speech encryption method - Google Patents
Android system oriented end-to-end speech encryption method Download PDFInfo
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Abstract
The invention provides an Android system oriented end-to-end speech encryption method. Eight modules including a speech acquisition and play module, an Android multimedia module, a speech coding and decoding module, a coding JNI (java native interface) module, a speex coding and decoding module, a speech network transmission module, an encryption and decryption JNI module and an encryption and decryption module are involved in the method. The method includes that the speech acquisition and play module acquires and plays speeches of both communication parties by invoking the Android multimedia module; the speech coding and decoding module invokes the speex coding and decoding module through a coding and decoding JNI module to perform compression coding on sent data and decoding restoration on received data; the speech network transmission module performs network sending and network receiving on speech data and invokes the encryption and decryption module through the encryption and decryption JNI module to realize encryption and decryption of audio data during encryption communication.
Description
Technical field
The invention belongs to field of information security technology, particularly relate to based on the end-to-end speech ciphering method of ZRTP (Media Path Key Agreement for Unicast Secure RTP) technological side to android system.
Background technology
In current mobile phone operating system, Andorid has occupied smart mobile phone market greatly.Android system, due to its good Consumer's Experience and characteristic of increasing income, adds and supports that manufacturer is numerous, a great variety of product lines, product diversification, so just establish huge user base in a short period of time.Present stage, android system is gradually improved and stablizes, and the application and development carrying out ip voice for us on this platform provides reliable support.Meanwhile, the layout of WIFI hot spot is quite easy, and the development also comparative maturity of the hardware such as wireless router, the application being us in network facet provides necessary condition.But there is various potential safety hazard at present as the IP network of voice over IP transmission medium, the IP packet on network is is very likely intercepted and captured by hacker, causes speech lose or be ravesdropping.Therefore, the safe transmission of ip voice on network is a very important problem, has become the focus of investigation and application.
Application number is 201110047965.2 implementation methods proposing a kind of VoIP Media Stream credible delivery based on ZRTP cipher key change, and the method has carried out part amendment to ZRTP agreement on the basis of ZRTP agreement, is then realized by hardware chip.This method is not towards Android platform but is realized by hardware chip, does not therefore have extensibility and portability; Destroy on the other hand the ZRTP agreement of standard, the platform intercommunication of ZRTP agreement cannot be supported with other.
Application number is 200810132259.6 propose a kind of end-to-end speech ciphering method, Apparatus and system, the caller both sides being in talking state in this invention receive the key information that Key Management server is sent by the mode of short message, and realize speech scrambling according to key message.This invention needs Key Management server, with high costs, to be difficult to accept by general user, and send key by the mode of short message, key is is easily intercepted and captured, and security intensity is low.
Application number is 200810068567.7 propose a kind of speech ciphering method, decryption method, encipher-decipher method and mobile terminal, periodically transmit obtaining speech data frame to be sent to encrypting module, after encrypting module is encrypted the speech data frame received, send the speech data of encryption, by deciphering module, rear broadcasting is decrypted to the speech data received.This invention proposes encipher-decipher method for cdma network, is only encrypted speech data frame and does not carry out authentication, being easily subject to third party attack.And key agreement is carried out in this invention, namely key is fixing.Such encryption very easily suffers Brute Force, is unsafe.
Application number is 200610113226.9 propose a kind of End to End Encryption method based on mobile communications network and encryption system, this invention adopts stream cipher system to carry out End to End Encryption, KMC is adopted to carry out key management to whole secrecy system, according to secret generating encryption key stream/or the decruption key stream of KMC's distribution, be encrypted by the speech data of XOR algorithm to plain/cipher text/decipher.This invention lacks the specific implementation in Android phone; Need special KMC, need high cost; Adopt XOR algorithm, Cipher Strength is lower, is easily attacked.
The present invention realizes in Android phone system, strict implement ZRTP agreement, can support the platform intercommunication of ZRTP agreement with other; Again arranging key during each communication, one-time pad, Cipher Strength is high; Do not need expensive PKIX to carry out cipher key change, the end-to-end voice transfer safety of vast Android phone user can be met.
Summary of the invention
Technical problem: technical problem to be solved by this invention is to provide a kind of End to End Encryption method towards android system, it is developed towards Android platform, strict implement ZRTP IKE, meets the needs of the end-to-end secure communication of vast Android intelligent user.
Technical scheme: the invention provides a kind of end-to-end speech ciphering method towards android system, mainly comprises following eight modules:
1) voice collecting playing module: this module is positioned at android system application layer, for gathering and play the speech data of both call sides, realizes its function by calling Android multi-media module.Voice collecting playing module comprises recording module and playback module two parts:
Recording module: by calling the Audio Record module acquires PCM initial data in Android multi-media module, complete the seizure of voice data.Audio Record module setting audio passage is CHANNEL_CONFIGURATION_MON, and coded system is the sample size obtaining audio frequency after ENCODING_PCM_16BIT, and by setting acquiring size voice data.
Playback module: parsing broadcasting is carried out to the packets of audio data that speech coding decoder module passes over.Comprise the Audio Track module first called in Android multi-media module, build audio data buffer again, when have from speech coding decoder module transmit data come time, by the speech data that receives stored in audio data buffer, play by the audio frequency of Audio Track module to audio data buffer.
2) Android multi-media module: this module is called by voice collecting playing module, and then realize the function of voice collecting playing module.This module comprises Audio Record and Audio Track module two parts:
Audio Record module: this module is arranged in the android.media bag of Android SDK, for gathering original audio data.
Audio Track module: this module is arranged in the android.media bag of Android SDK, for the voice data after broadcast decoder reduction.
3) speech coding decoder module: this module is positioned at android system application layer, for carrying out compressed encoding to the PCM packet collected and carrying out decoded back to the packet that network receives, call speex coding/decoding module by encoding and decoding JNI interface module and realize its function.Speech coding decoder module comprises speech coding module and tone decoding module two parts:
Speech coding module: realize voice compression coding, reduces coding bit rate, is beneficial to voice data in transmission over networks.
Tone decoding module: realize voice data decoded back, is beneficial to the broadcasting of audio frequency apparatus to voice data.
4) encoding and decoding JNI interface module: this module is an intermediate layer between speech coding decoder module and speex coding module, be beneficial to the communication between these two modules, encoding and decoding JNI interface module comprises coding JNI interface module and decoding JNI interface module two parts:
Coding JNI interface module: this module achieves an audio_encode interface, can realize android system speech coding module calling speex coding module by this interface.
Decoding JNI interface module: this module achieves an audio_decode interface, can realize android system tone decoding module calling speex decoder module by this interface.
5) speex coding module: this module adopts C language to realize, and completes the Code And Decode to voice data, comprises speex coding module and speex decoder module two parts:
Speex coding module: complete and speex compressed encoding is carried out to speech data.
Speex decoder module: complete and speex decoded back is carried out to speech data.
6) speech network transport module: this module is positioned at android system application layer, for carrying out network transmission and network reception to VoP, comprises network sending module and network reception module two parts:
Network sending module: voice data is sent to network.When carrying out ZRTP coded communication, first calling ZRTP encrypting module by encryption JNI interface module and carrying out ZRTP key agreement, with the secret key encryption RTP packet consulted, then the voice data after encryption being sent to network.
Network reception module: receive the voice data that network transmits.When carrying out ZRTP coded communication, after receiving the encrypted packets that network transmits, first calling ZRTP deciphering module by deciphering JNI interface module and encrypted audio data be decrypted, then the delivery of audio data after deciphering to tone decoding module.
7) encryption and decryption JNI interface module: this module is an intermediate layer between speech network transport module and encryption/decryption module, is beneficial to the communication between these two modules.Encryption and decryption JNI interface module comprises encryption JNI interface module, deciphering JNI interface module two parts:
Encryption JNI interface module: this module achieves a zrtp_ecncryt interface, can realize Anroid grid sending module calling ZRTP encrypting module by this interface.
Deciphering JNI interface module: this module achieves a zrtp_decrypt interface, can realize android system network reception module calling ZRTP deciphering module by this interface.
8) encryption/decryption module: this module employing C language achieves the ZRTP encrypting and decrypting to voice data.Encryption/decryption module comprises ZRTP encrypting module, ZRTP deciphering module two parts:
ZRTP encrypting module: realize ZRTP session key agreement and voice data is encrypted.
ZRTP deciphering module: realize to network reception to ZRTP encrypted audio data be decrypted.
Beneficial effect: the end-to-end speech ciphering method towards android system realized by the present invention, strict implement ZRTP agreement is also achieved in Android platform, is with good expansibility and different operating system interoperability; Carry out key agreement by ZRTP agreement, one-time pad, Cipher Strength is high; Do not need PKIX, realize voice safe transmission with cheap cost, prevent and to be ravesdropping during voice communication or to attack, fully meet the coded communication needs of vast Android phone user.
Accompanying drawing explanation
Fig. 1 is application scenarios of the present invention;
Fig. 2 is overall structure schematic diagram of the present invention;
Fig. 3 is ZRTP key agreement flow process of the present invention;
Fig. 4 is running software flow chart of the present invention.
Embodiment
In order to set forth the present invention further for the technological means reaching predetermined goal of the invention and take and effect, below in conjunction with accompanying drawing, the embodiment of the end-to-end speech ciphering method towards android system that the present invention proposes and principle are described in detail.
Application scenarios of the present invention as shown in Figure 1.User mobile phone is by point or the 3G network access IP network of getting online without being tethered to a cable, after communicating pair sets up RTP session, add ZRTP information at the extended field of RTP packet and carry out ZRTP session key agreement, then carry out voice encryption communication with the session key consulted through IP network.
Overall structure schematic diagram of the present invention as shown in Figure 2.Voice collecting playing module gathers and plays the voice of both call sides, and is converted into digital information.This part realizes carrying out recording and playback in android system by calling Android multi-media module, call on the one hand the voice data write buffer memory that Audio Record module will gather, call Audio Track module on the other hand and read decoded voice data and play; Speech coding decoder module carries out compressed encoding to the voice data sent and reduces to the decoding data received.This part is called speex coding/decoding module by encoding and decoding JNI interface module and is realized carrying out speech coding and decoding in android system, call speex coding module by coding JNI interface module on the one hand and realize voice compression coding, improve coding bit rate, be beneficial to Internet Transmission, call speex decoder module by decoding JNI interface module on the other hand and realize voice data decoded back, be beneficial to audio frequency apparatus and play; Speech network transport module completes the voice data transmitted to network transmission voice data and reception network.When carrying out ZRTP coded communication, this part is called encryption/decryption module by encryption and decryption JNI interface module and is realized encryption and decryption, on the one hand calls ZRTP encrypting module and realizes the session key that communicating pair ZRTP session key agreement and utilization consult by encrypting JNI interface module and carry out voice encryption before sending voice data to network; On the other hand after receiving the voice data that network transmits, call ZRTP deciphering module by deciphering JNI interface module to realize voice and decipher.
When Android phone end is encrypted communication in IP network, as transmitting terminal again as receiving terminal, should be described in detail using mobile phone as transmitting terminal and receiving terminal two kinds of situations respectively below in conjunction with accompanying drawing 2 simultaneously:
One, Android phone is as transmitting terminal.
1) after communicating pair sets up RTP session, transmitting terminal Android phone carries out PCM sampling by the recording module in voice collecting playing module, first by calling the Audio Record module in Android multi-media module, complete the seizure of Android phone transmitting terminal voice data.Be CHANNEL_CONFIGURATION_MON by Audio Record module setting audio passage again, coded system is the sample size obtaining audio frequency after ENCODING_PCM_16BIT, obtains voice data by setting sample size;
2) delivery of audio data after sampling is carried out voice compression coding to the speech coding module in speech coding decoder module.Speech coding adopts the realization of the speex coding module in speex coding/decoding module to carry out compressed encoding to the voice data after sampling, wherein speex coding module achieves speex compressed encoding, reduce coding bit rate, original audio data is become the form being adapted at transmission over networks.Android system application layer is based on JAVA programming language, directly cannot call the speex coding that C language realizes, so realized by coding JNI interface module, this module achieves an audio_encode interface, can call speex coding module realize voice compression coding by this interface android system speech coding module.
3) by coding after delivery of audio data to the network sending module of speech network transport module, before network sending module is sent to network voice data, network sending module calls ZRTP encrypting module by encryption JNI interface module and realizes ZRTP encryption, and ZRTP ciphering process is as follows:
ZRTP ciphering process calls ZRTP encrypting module by network sending module by encryption JNI interface module and realizes, wherein ZRTP encrypting module achieves ZRTP session key agreement by C language and utilizes the session key consulted to be encrypted RTP packet, encryption JNI interface module achieves a zrtp_encrypt interface, can call ZRTP encrypting module realize ZRTP encryption by this interface android system network sending module.ZRTP encryption flow as shown in Figure 3, after communicating pair sets up RTP session, injects the information of ZRTP to RTP packet extended field, namely send the connection that Hello message is initialised to opposite end.Sending Hello message is for checking the other side's application program whether to support the version number of ZRTP and the ZRTP that supports, digest algorithm, cryptographic algorithm, public key type, SAS algorithm and ZID.After called end receives Hello message, use HelloACK acknowledgement messaging, show oneself to support ZRTP agreement.After communicating pair have exchanged Hello and HelloACK message, use Commit message to start DH and exchange, initiate the negotiation of shared key.After consulting shared key according to cipher key agreement algorithm, shared key is utilized to calculate SRTP session encryption key, session authentication key and brief authentication information SAS, SAS will be shown on mobile phone screen, confirm whether the VoP of this call has suffered to distort for communicating pair by voice, if communicating pair SAS value is consistent, calling terminal and called end just can be set up new SRTP and be connected, and transmit the voice messaging after using session key to user.After establishing SRTP and connecting, both sides also need to send Confirm message and do last confirmation.Being successfully create session key in order to ensure both sides on the one hand, is that before will recording, whether user has carried out voice confirmation to SAS on the other hand.
After completing ZRTP encryption, network sending module is sent to network voice data.
When Android phone is as transmitting terminal, above three steps complete and gather original audio data is sent to network process to encryption.
Two, Android phone is as receiving terminal.
1) first the ZRTP encrypted packets come from network is delivered to the network reception module of speech network transport module, network reception module is after receiving the encrypted audio data bag that network transmits, call by deciphering JNI interface module the deciphering that ZRTP deciphering module completes voice data, ZRTP decrypting process is as follows:
ZRTP decrypting process calls ZRTP deciphering module by network reception module by deciphering JNI interface module and realizes, wherein ZRTP deciphering module is achieved by C language and is decrypted encrypted audio data bag according to ZRTP agreement, deciphering JNI interface module achieves a zrtp_decrypt interface, can call ZRTP deciphering module realize reducing to the deciphering of encrypted audio data by this interface android system network reception module.When deciphering, session key used is preserved at negotiation phase by ZRTP encrypting module, and the ZRTP deciphering module ZRTP session key preserved is decrypted computing.
2) deciphering after delivery of audio data to the tone decoding module in speech coding decoder module, decoded back is completed by tone decoding module, tone decoding module is called speex decoder module by decoding JNI interface module and is realized decoding, wherein speex decoder module achieves speex decoded back, voice data is become the form being beneficial to audio frequency apparatus and playing, decoding JNI interface module achieves an audio_decode interface, can call speex decoder module realize decoded back function by this interface android system tone decoding module.
3) playback module that the data after decoded back pass to voice collecting playing module is completed the broadcasting of voice data.First call Audio Track module, then build audio decoder buffer, when decoded data are delivered to playing module, by the voice data that receives stored in decoding buffer zone, by Audio Track module, decoding is carried out to buffering area audio frequency and play.
When Android phone is as receiving terminal, above three steps complete the process from network reception encrypted speech to audio plays.
When user utilizes Android phone to communicate, Android phone needs simultaneously as transmitting terminal and receiving terminal.The present invention makes Android phone end can carry out ZRTP coded communication as transmitting terminal and receiving terminal by multithreading simultaneously, below in conjunction with accompanying drawing 4, running software flow process is described.
If communicating pair all supports ZRTP key agreement:
1) dial, set up RTP session 4-1.
2) inject ZRTP information at RTP extended field, after detecting that ZRTP key agreement is supported in opposite end, complete ZRTP key agreement at media channel, mobile phone screen demonstrates negotiation result and checking character string 4-2.
3) if the checking character string that communicating pair mobile phone shows is consistent, then illustrate that this communication is not under attack, communicating pair carries out enciphoring voice telecommunication 4-3 after carrying out voice confirmation; If the checking SAS that communicating pair mobile phone shows is inconsistent, mobile phone screen ejects prompting frame allows user select 4-4, transmits if select to reduce level of security, then carry out normal voice transmission 4-6, reduce level of security if be unwilling, then can select the 4-5 that hangs up the telephone.
If communicating pair has a side not support ZRTP key agreement:
1) dial, set up RTP session 4-1.
2) support that the Android phone of ZRTP encryption injects ZRTP information at RTP extended field, detect that ZRTP key agreement is not supported in opposite end, mobile phone screen is pointed out user opposite end do not support ZRTP key agreement, and point out user to make one's options 4-7.
User makes one's options according to the prompting on mobile phone screen according to the demand of oneself, reduces level of security and transmits, then carry out normal speech communication 4-6 if select; Reduce level of security to transmit if be unwilling, then can select the 4-5 that hangs up the telephone.
Claims (10)
1. towards an end-to-end speech ciphering method for android system, it is characterized in that: the voice that voice collecting playing module gathers by calling Android multi-media module and plays both call sides; Speech coding decoder module calls the voice data of speex coding/decoding module to transmission by encoding and decoding JNI interface module to carry out compressed encoding and carries out decoded back to the voice data received; Speech network transport module completes the voice data transmitted to network transmission voice data and reception network.
2. as claimed in claim 1 towards the end-to-end speech ciphering method of android system, it is characterized in that: described voice collecting playing module comprises recording module and playback module, the sampled value of recording module setting audio, and obtain voice data by the sampled value of setting; Playback module reads decoded voice data and plays.
3. as claimed in claim 2 towards the end-to-end speech ciphering method of android system, it is characterized in that: recording module setting audio sampled value, and obtain voice data by the sampled value of setting and comprise: recording module by obtaining the sampled value of audio frequency after to be CHANNEL_CONFIGURATION_MON coded system the be ENCODING_PCM_16BIT of the Audio Record module setting audio passage in Android multi-media module, and obtains voice data by the value of setting.
4. as claimed in claim 2 towards the end-to-end speech ciphering method of android system, it is characterized in that: playback module reads decoded voice data and plays, comprise: first call Audio Track module, build audio decoder buffer again, when there being decoded voice data to transmit, by the voice data that receives stored in decoding buffer zone, by Audio Track module, decoding is carried out to buffering area audio frequency and play.
5. as claimed in claim 1 towards the end-to-end speech ciphering method of android system, it is characterized in that: described speech coding decoder module is compressed by speech coding module and tone decoding module the speech data gathering/play/reduces.
6. as claimed in claim 5 towards the end-to-end speech ciphering method of android system, it is characterized in that: speech coding module carries out compressed encoding to the PCM initial data gathered, comprise: in coding JNI interface module, achieve an audio_encode interface, call speex coding module by the speech coding module of this Interface realization android system and complete voice compression coding.
7. as claimed in claim 5 towards the end-to-end speech ciphering method of android system, it is characterized in that: tone decoding module carries out decoded back to encoded voice data, comprise: in decoding JNI interface module, achieve an audio_decode interface, call speex decoder module by the tone decoding module of this Interface realization android system and complete tone decoding reduction.
8. as claimed in claim 1 towards the end-to-end speech ciphering method of android system, it is characterized in that: described speech network transport module calls the voice data of encryption/decryption module to transmission by encryption and decryption JNI interface module and is encrypted or deciphers.
9. as claimed in claim 8 towards the end-to-end speech ciphering method of android system, it is characterized in that: network sending module is before transmission voice data to network, first call by encryption JNI interface module the encryption that ZRTP encrypting module carries out voice data, comprise: in encryption JNI interface module, achieve a zrtp_encrypt interface, android system network sending module realizes voice data encryption by this interface interchange ZRTP encrypting module, after completing voice data encryption, network sending module is sent to network encrypted audio data.
10. as claimed in claim 8 towards the end-to-end speech ciphering method of android system, it is characterized in that: after network reception module receives encrypted audio data bag, the deciphering that ZRTP deciphering module is encrypted voice data is called by deciphering JNI interface module, comprise: in deciphering JNI interface module, achieve a zrtp_decrypt interface, android system network reception module realizes the deciphering to encrypted audio data by this interface interchange ZRTP deciphering module, after completing voice data deciphering, network reception module by delivery of audio data to tone decoding module.
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| 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 |
| CN108809645A (en) * | 2018-07-24 | 2018-11-13 | 南方电网科学研究院有限责任公司 | The method, apparatus and electrical power distribution automatization system of key agreement |
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| CN112184933A (en) * | 2020-09-30 | 2021-01-05 | 广州市埃特斯通讯设备有限公司 | ETC handset system capable of realizing voice talkback function |
| CN113257260A (en) * | 2021-04-09 | 2021-08-13 | 中国质量认证中心 | Transmission method and terminal equipment for secret communication of mobile phone |
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Application publication date: 20141217 |