CN105788602A - Voice encryption method and device for voice band compression system - Google Patents
Voice encryption method and device for voice band compression system Download PDFInfo
- Publication number
- CN105788602A CN105788602A CN201610184607.9A CN201610184607A CN105788602A CN 105788602 A CN105788602 A CN 105788602A CN 201610184607 A CN201610184607 A CN 201610184607A CN 105788602 A CN105788602 A CN 105788602A
- Authority
- CN
- China
- Prior art keywords
- subframe
- sample
- order
- carried out
- obtains
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
- G10L19/04—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using predictive techniques
- G10L19/06—Determination or coding of the spectral characteristics, e.g. of the short-term prediction coefficients
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Computational Linguistics (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Audiology, Speech & Language Pathology (AREA)
- Human Computer Interaction (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
Abstract
The invention relates to a voice encryption method and device for a voice band compression system. The method comprises that original voice data is collected, and enframed to obtain multiple subframes; the subframes are encrypted respectively to obtain multiple subframe sending samples; the subframe sending samples are compressed via an encoder to obtain multiple compressed subframe sending samples; the multiple compressed subframe sending samples is decompressed via a decoder to obtain the multiple subframe sending samples, the multiple subframe sending samples are decrypted to obtain multiple subframe plaintext samples; and the multiple subframe plaintext samples are combined to obtain a combined plaintext sample. According to the method and device of the invention, the voice encryption intensity can be improved.
Description
Technical field
The present invention relates to moving communicating field, particularly relate to a kind of speech ciphering method for voice band compressibility and device.
Background technology
Current mobile communications standard mainly has GSM, CDMA, CDMA2000, WCDMA etc., the terminal unit of these communication standards all employ linear predictive coding (LPC) technology substantially, namely only for phonic signal character implement parameter coding but not waveform coding, it is, with raw tone, there is same or analogous auditory effect through decoded effect, but waveform is inconsistent.Therefore, if directly encrypted after raw tone compressed encoding, analogue signal then it is modulated into, it is impossible to pass through all kinds of mobile voice band compression system.And using traditional sound time domain scrambling or scrambling, remaining intelligibility is bigger than normal, and Cipher Strength is inadequate, does not reach the requirement of encryption voice call.
Summary of the invention
The technical problem to be solved is to provide a kind of speech ciphering method for voice band compressibility and device.
The technical scheme is that a kind of speech ciphering method for voice band compressibility, described method includes: gathers primary voice data, and described primary voice data is carried out framing obtains multiple subframe；The plurality of subframe is encrypted respectively and obtains multiple subframe transmission sample；The plurality of subframe is sent sample and is compressed obtaining multiple subframes transmission sample of compression by encoder；Multiple subframes of described compression send sample carry out decompression by decoder and obtain the plurality of subframe and send sample, and the plurality of subframe is sent sample be decrypted process and obtain multiple subframe plaintext sample；It is combined obtaining combination expressly sample to the plurality of subframe expressly sample.
This invention address that another technical scheme of above-mentioned technical problem is as follows: a kind of voice encryption device for voice band compressibility, including:
Framing unit, is used for gathering primary voice data, and described primary voice data is carried out framing obtains multiple subframe；Cryptographic processing unit, obtains multiple subframe transmission sample for the plurality of subframe being encrypted respectively；Compression unit, the multiple subframes being compressed obtaining compression by encoder for the plurality of subframe sends sample send sample；Decryption processing unit, carries out decompression by decoder and obtains the plurality of subframe for multiple subframes of described compression send sample and send sample, and the plurality of subframe sends sample is decrypted process and obtains multiple subframe plaintext sample；Assembled unit, for being combined obtaining combination expressly sample to the plurality of subframe expressly sample.
Beneficial effects of the present invention: obtain multiple subframe by primary voice data is carried out framing, multiple subframes are encrypted respectively and obtain multiple subframe transmission sample, multiple subframes are sent sample and is compressed obtaining multiple subframes transmission sample of compression by encoder, multiple subframes of compression transmission sample is carried out decompression by decoder and obtains multiple subframe transmission sample, and multiple subframes are sent sample be decrypted process and obtain multiple subframe expressly sample, such that it is able to improve voice encryption intensity.
Accompanying drawing explanation
A kind of speech ciphering method flow chart for voice band compressibility that Fig. 1 provides for the embodiment of the present invention；
A kind of voice encryption device schematic diagram for voice band compressibility that Fig. 2 provides for the embodiment of the present invention.
In accompanying drawing, the list of parts representated by each label is as follows:
1, framing unit, 2, cryptographic processing unit, 3, compression unit, 4, decryption processing unit, 5, assembled unit.
Detailed description of the invention
Below in conjunction with accompanying drawing, principles of the invention and feature being described, example is served only for explaining the present invention, is not intended to limit the scope of the present invention.
A kind of speech ciphering method flow chart for voice band compressibility that Fig. 1 provides for the embodiment of the present invention.
With reference to Fig. 1, step S101, gather primary voice data, and described primary voice data is carried out framing obtain multiple subframe.
Step S102, is encrypted the plurality of subframe respectively and obtains multiple subframe transmission sample.
Step S103, sends the plurality of subframe sample and is compressed obtaining multiple subframes transmission sample of compression by encoder.
Multiple subframes of described compression are sent sample and carry out decompression by decoder and obtain the plurality of subframe and send sample by step S104, and the plurality of subframe sends sample are decrypted process and obtain multiple subframe plaintext sample.
Step S105, is combined obtaining combination expressly sample to the plurality of subframe expressly sample.
In the present embodiment, described the plurality of subframe is encrypted respectively obtain multiple subframe send sample include:
The plurality of subframe is carried out respectively fast Fourier transform and obtains multiple subframe conversion sample；
By the plurality of subframe convert sample by High-Order Pseudo random sequence carry out out of order obtain multiple out of order subframe convert sample；
The plurality of out of order subframe is converted sample and obtains the plurality of subframe transmission sample by Fast Fourier Transform Inverse.
In the present embodiment, described sample that the plurality of subframe is sent is decrypted process and obtains multiple subframe expressly sample and include:
The plurality of subframe is sent sample and goes out subframe by the synchronizing signal sub-argument that full range spectral domain synchronizing sequence produces, and the plurality of subframe transmission sample is carried out described fast Fourier transform obtain multiple subframe Fourier transformation sample；
The plurality of subframe Fourier transformation sample is carried out out of order recovery by described High-Order Pseudo random sequence and obtains multiple out of order recovery subframe Fourier transformation sample；
The plurality of out of order recovery subframe Fourier transformation sample is carried out described Fast Fourier Transform Inverse and obtains the plurality of subframe expressly sample.
Here, full range spectral domain synchronizing sequence is from formula (1):
AFSS=Σ αkcos(2*pi*fk*(1:N)/Fs+βk)(1)
Wherein, AFSS is full range spectral domain synchronizing sequence, αkFor the amplitude of kth cosine signal, fkIt is sample rate, β for the frequency of kth cosine signal, FskFor the sample length that the initial phase of kth cosine signal, N are cosine string signal, N is 2p, p is natural number, fk=(Fs/ N) * q, 300≤q≤2400, q is natural number.
All kinds of mobile voice band compression systems all can better transmit the characteristic of the tone signal of sound audio fragment gene section, utilizes this feature, and what construct sound frequency range fundamental tone section meets single-tone sequence in order to accurate synchronization, is referred to as entirely to compose synchronizing sequence, is abbreviated as AFSS.It is first slow rear fast that AFSS shows as positive and negative switching in time domain, can cover again whole fundamental frequency section on frequency domain.Frequency domain random scrambling includes fast Fourier transform and for the random scrambling of frequency domain data after conversion.The key seed that random scrambling sequence obtains based on key exchange before call generates out of order sequence through linear displacement feedback register.
The tone signal that AFSS sequence is all differed by the frequency in a series of sound frequency ranges, amplitude, initial phase is formed by stacking, and takes full advantage of the characteristic that all kinds of mobile voice band compression system all can better transmit the tone signal of gene frequency range；AFSS shows as first slow rear fast positive and negative switching in time domain, can cover again whole fundamental tone frequency range on frequency domain, and this characteristic ensure that can accomplish accurate synchronization based on AFSS sequence.Fast Fourier transform scramble is at whole sound frequency range scramble, rather than traditional Time Domain Piecewise scramble or simple inverted order compose scramble, are extremely a significant increase Cipher Strength.
In the present embodiment, described by the plurality of subframe convert sample by High-Order Pseudo random sequence carry out out of order obtain multiple out of order subframe convert sample include:
Being undertaken out of order by the M1～M/2 frequency that the plurality of subframe converts sample by described High-Order Pseudo random sequence, and conjugation is symmetric in the M/2+2～M2 frequency of the plurality of subframe conversion sample, wherein, M is the length of described subframe.
In the present embodiment, described the plurality of subframe Fourier transformation sample is carried out out of order recovery by described High-Order Pseudo random sequence obtain multiple out of order recovery subframe Fourier transformation sample and include:
By described High-Order Pseudo random sequence, the M1～M/2 frequency of the plurality of subframe Fourier transformation sample is carried out out of order recovery, and wherein, M is the length of described subframe.
Here, the value principle of M1 and M2 is the whole voice band of all standing 200Hz～3400Hz.
In the present embodiment, described described primary voice data is carried out framing obtain multiple subframe and include:
Described primary voice data carries out framing, and to obtain length be 2rThe plurality of subframe, wherein, r is the natural number more than 9.
Here, High-Order Pseudo random sequence S is obtained by linear displacement feedback register, S length is iM/2-1, according to specific mapping ruler, S is mapped as SS2, SS2 is the natural out of order arrangement of certain pseudorandom between 1～(iM/2-1), wherein, M is the length of described second subframe, and N is natural number.The exponent number of high-order this pseudo-random sequence S is not less than 28.
A kind of voice encryption device schematic diagram for voice band compressibility that Fig. 2 provides for the embodiment of the present invention.
With reference to Fig. 2, this device includes framing unit 1, cryptographic processing unit 2, compression unit 3, decryption processing unit 4 and assembled unit 5.
Framing unit 1, is used for gathering primary voice data, and described primary voice data is carried out framing obtains multiple subframe.
Cryptographic processing unit 2, obtains multiple subframe transmission sample for the plurality of subframe being encrypted respectively.
Compression unit 3, the multiple subframes being compressed obtaining compression by encoder for the plurality of subframe sends sample send sample.
Decryption processing unit 4, carries out decompression by decoder and obtains the plurality of subframe for multiple subframes of described compression send sample and send sample, and the plurality of subframe sends sample is decrypted process and obtains multiple subframe plaintext sample.
Assembled unit 5, for being combined obtaining combination expressly sample to the plurality of subframe expressly sample.
In the present embodiment, described cryptographic processing unit 2 includes:
The plurality of subframe is carried out respectively fast Fourier transform and obtains multiple subframe conversion sample；
By the plurality of subframe convert sample by High-Order Pseudo random sequence carry out out of order obtain multiple out of order subframe convert sample；
The plurality of out of order subframe is converted sample and obtains the plurality of subframe transmission sample by Fast Fourier Transform Inverse.
In the present embodiment, described decryption processing unit 4 includes:
The plurality of subframe is sent sample and goes out subframe by the synchronizing signal sub-argument that full range spectral domain synchronizing sequence produces, and the plurality of subframe transmission sample is carried out described fast Fourier transform obtain multiple subframe Fourier transformation sample；
The plurality of subframe Fourier transformation sample is carried out out of order recovery by described High-Order Pseudo random sequence and obtains multiple out of order recovery subframe Fourier transformation sample；
The plurality of out of order recovery subframe Fourier transformation sample is carried out described Fast Fourier Transform Inverse and obtains the plurality of subframe expressly sample.
In the present embodiment, described cryptographic processing unit 2 also includes:
Being undertaken out of order by the M1～M/2 frequency that the plurality of subframe converts sample by described High-Order Pseudo random sequence, and conjugation is symmetric in the M/2+2～M2 frequency of the plurality of subframe conversion sample, wherein, M is the length of described subframe.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within protection scope of the present invention.
Claims (10)
1. the speech ciphering method for voice band compressibility, it is characterised in that described method includes:
Gather primary voice data, and described primary voice data is carried out framing obtain multiple subframe；
The plurality of subframe is encrypted respectively and obtains multiple subframe transmission sample；
The plurality of subframe is sent sample and is compressed obtaining multiple subframes transmission sample of compression by encoder；
Multiple subframes of described compression send sample carry out decompression by decoder and obtain the plurality of subframe and send sample, and the plurality of subframe is sent sample be decrypted process and obtain multiple subframe plaintext sample；
It is combined obtaining combination expressly sample to the plurality of subframe expressly sample.
2. a kind of speech ciphering method for voice band compressibility according to claim 1, it is characterised in that described the plurality of subframe is encrypted respectively obtain multiple subframe send sample include:
The plurality of subframe is carried out respectively fast Fourier transform and obtains multiple subframe conversion sample；
By the plurality of subframe convert sample by High-Order Pseudo random sequence carry out out of order obtain multiple out of order subframe convert sample；
The plurality of out of order subframe is converted sample and obtains the plurality of subframe transmission sample by Fast Fourier Transform Inverse.
3. a kind of speech ciphering method for voice band compressibility according to claim 2, it is characterised in that described sample that the plurality of subframe is sent is decrypted process and obtains multiple subframe expressly sample and include:
The plurality of subframe is sent sample and goes out subframe by the synchronizing signal sub-argument that full range spectral domain synchronizing sequence produces, and the plurality of subframe transmission sample is carried out described fast Fourier transform obtain multiple subframe Fourier transformation sample；
The plurality of subframe Fourier transformation sample is carried out out of order recovery by described High-Order Pseudo random sequence and obtains multiple out of order recovery subframe Fourier transformation sample；
The plurality of out of order recovery subframe Fourier transformation sample is carried out described Fast Fourier Transform Inverse and obtains the plurality of subframe expressly sample.
4. a kind of speech ciphering method for voice band compressibility according to claim 2, it is characterised in that described by the plurality of subframe convert sample by High-Order Pseudo random sequence carry out out of order obtain multiple out of order subframe convert sample include:
Being undertaken out of order by the M1～M/2 frequency that the plurality of subframe converts sample by described High-Order Pseudo random sequence, and conjugation is symmetric in the M/2+2～M2 frequency of the plurality of subframe conversion sample, wherein, M is the length of described subframe.
5. a kind of speech ciphering method for voice band compressibility according to claim 3, it is characterized in that, described the plurality of subframe Fourier transformation sample is carried out out of order recovery by described High-Order Pseudo random sequence obtain multiple out of order recovery subframe Fourier transformation sample and include:
By described High-Order Pseudo random sequence, the M1～M/2 frequency of the plurality of subframe Fourier transformation sample is carried out out of order recovery, and wherein, M is the length of described subframe.
6. a kind of speech ciphering method for voice band compressibility according to claim 1, it is characterised in that described described primary voice data is carried out framing obtain multiple subframe and include:
Described primary voice data carries out framing, and to obtain length be 2rThe plurality of subframe, wherein, r is the natural number more than 9.
7. the voice encryption device for voice band compressibility, it is characterised in that described device includes:
Framing unit, is used for gathering primary voice data, and described primary voice data is carried out framing obtains multiple subframe；
Cryptographic processing unit, obtains multiple subframe transmission sample for the plurality of subframe being encrypted respectively；
Compression unit, the multiple subframes being compressed obtaining compression by encoder for the plurality of subframe sends sample send sample；
Decryption processing unit, carries out decompression by decoder and obtains the plurality of subframe for multiple subframes of described compression send sample and send sample, and the plurality of subframe sends sample is decrypted process and obtains multiple subframe plaintext sample；
Assembled unit, for being combined obtaining combination expressly sample to the plurality of subframe expressly sample.
8. a kind of voice encryption device for voice band compressibility according to claim 7, it is characterised in that described cryptographic processing unit includes:
The plurality of subframe is carried out respectively fast Fourier transform and obtains multiple subframe conversion sample；
By the plurality of subframe convert sample by High-Order Pseudo random sequence carry out out of order obtain multiple out of order subframe convert sample；
The plurality of out of order subframe is converted sample and obtains the plurality of subframe transmission sample by Fast Fourier Transform Inverse.
9. a kind of voice encryption device for voice band compressibility according to claim 8, it is characterised in that described decryption processing unit includes:
The plurality of subframe is sent sample and goes out subframe by the synchronizing signal sub-argument that full range spectral domain synchronizing sequence produces, and the plurality of subframe transmission sample is carried out described fast Fourier transform obtain multiple subframe Fourier transformation sample；
The plurality of subframe Fourier transformation sample is carried out out of order recovery by described High-Order Pseudo random sequence and obtains multiple out of order recovery subframe Fourier transformation sample；
The plurality of out of order recovery subframe Fourier transformation sample is carried out described Fast Fourier Transform Inverse and obtains the plurality of subframe expressly sample.
10. a kind of voice encryption device for voice band compressibility according to claim 8, it is characterised in that described cryptographic processing unit also includes:
Being undertaken out of order by the M1～M/2 frequency that the plurality of subframe converts sample by described High-Order Pseudo random sequence, and conjugation is symmetric in the M/2+2～M2 frequency of the plurality of subframe conversion sample, wherein, M is the length of described subframe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610184607.9A CN105788602A (en) | 2016-03-28 | 2016-03-28 | Voice encryption method and device for voice band compression system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610184607.9A CN105788602A (en) | 2016-03-28 | 2016-03-28 | Voice encryption method and device for voice band compression system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105788602A true CN105788602A (en) | 2016-07-20 |
Family
ID=56391434
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610184607.9A Pending CN105788602A (en) | 2016-03-28 | 2016-03-28 | Voice encryption method and device for voice band compression system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105788602A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106878299A (en) * | 2017-02-08 | 2017-06-20 | 中国人民解放军信息工程大学 | A kind of voice encryption, decryption method and equipment |
| CN116778936A (en) * | 2023-08-17 | 2023-09-19 | 建朗电子（深圳）有限公司 | Audio compression and recovery method based on chaotic mapping and human ear model |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002537584A (en) * | 1999-02-16 | 2002-11-05 | チューンツー．コム，インコーポレイテッド | Audio synthesis using digital sampling of encoded waveforms |
| CN101014060A (en) * | 2007-02-02 | 2007-08-08 | 东南大学 | Voice encryption method for GoTone handset with anti longterm prediction rule pulse excitation compression coding |
| CN101577605A (en) * | 2008-05-08 | 2009-11-11 | 吴志军 | Speech LPC hiding and extraction algorithm based on filter similarity |
| US20100098254A1 (en) * | 2008-10-17 | 2010-04-22 | Motorola, Inc. | Method and device for sending encryption parameters |
| CN102624518A (en) * | 2012-03-05 | 2012-08-01 | 华中科技大学 | Voice encryption and decryption method |
| CN104333455A (en) * | 2014-11-26 | 2015-02-04 | 肖龙旭 | Secrete communication system and method for smart phone |
| CN105071895A (en) * | 2015-07-20 | 2015-11-18 | 庞潼川 | Method of transmitting and receiving data capable of penetrating various vocoders and system |
-
2016
- 2016-03-28 CN CN201610184607.9A patent/CN105788602A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002537584A (en) * | 1999-02-16 | 2002-11-05 | チューンツー．コム，インコーポレイテッド | Audio synthesis using digital sampling of encoded waveforms |
| CN101014060A (en) * | 2007-02-02 | 2007-08-08 | 东南大学 | Voice encryption method for GoTone handset with anti longterm prediction rule pulse excitation compression coding |
| CN101577605A (en) * | 2008-05-08 | 2009-11-11 | 吴志军 | Speech LPC hiding and extraction algorithm based on filter similarity |
| US20100098254A1 (en) * | 2008-10-17 | 2010-04-22 | Motorola, Inc. | Method and device for sending encryption parameters |
| CN102624518A (en) * | 2012-03-05 | 2012-08-01 | 华中科技大学 | Voice encryption and decryption method |
| CN104333455A (en) * | 2014-11-26 | 2015-02-04 | 肖龙旭 | Secrete communication system and method for smart phone |
| CN105071895A (en) * | 2015-07-20 | 2015-11-18 | 庞潼川 | Method of transmitting and receiving data capable of penetrating various vocoders and system |
Non-Patent Citations (2)
| Title |
|---|
| 中国大百科全书出版社编辑部: "《中国大百科全书 电子学与计算机1》", 31 October 1998 * |
| 金堃: "移动通信网中的端到端语音加密技术研究", 《中国优秀硕士学位论文全文数据库 信息科技辑》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106878299A (en) * | 2017-02-08 | 2017-06-20 | 中国人民解放军信息工程大学 | A kind of voice encryption, decryption method and equipment |
| CN106878299B (en) * | 2017-02-08 | 2019-06-11 | 中国人民解放军信息工程大学 | A kind of voice encryption, decryption method and equipment |
| CN116778936A (en) * | 2023-08-17 | 2023-09-19 | 建朗电子（深圳）有限公司 | Audio compression and recovery method based on chaotic mapping and human ear model |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102624518B (en) | Voice encryption and decryption method | |
| CN103377654A (en) | Voice security method, encryption and decryption method and security equipment | |
| CN101568110A (en) | Wireless data transmission method and system | |
| Habib et al. | Secure speech communication algorithm via DCT and TD-ERCS chaotic map | |
| CN103002406B (en) | A kind of voice encryption method being applied to arrowband radio digital communication system | |
| CN105788602A (en) | Voice encryption method and device for voice band compression system | |
| Abro et al. | Towards security of GSM voice communication | |
| de Andrade et al. | Speech privacy for modern mobile communication systems | |
| Hermassi et al. | A joint encryption-compression codec for speech signals using the ITU-T G. 711 standard and chaotic map | |
| CN103095625A (en) | Scramble initial value collocation method | |
| KR102299916B1 (en) | Inter-channel phase difference parameter coding method and device | |
| CN103956163A (en) | Common voice and encrypted voice interconversion system and method | |
| Manjula et al. | Enhanced secure image steganography using double encryption algorithms | |
| Ryan et al. | Communications and information systems | |
| CN112614498A (en) | Method for modulating low-speed data into voice-like signal | |
| US20160173456A1 (en) | Dynamic Spectrum Audio Encryption and Decryption Device | |
| Rajanarayanan et al. | Recent developments in signal encryption–A critical survey | |
| CN104994500B (en) | A kind of speech security transmission method and device for mobile phone | |
| JP2013098869A (en) | Voice system | |
| Ali et al. | Covert voip communication based on audio steganography | |
| CN104270538B (en) | Dual transformer echo cancellation digital telephone cipher machine | |
| Rehman et al. | Effective model for real time end to end secure communication over gsm voice channel | |
| CN106098073A (en) | A kind of end-to-end speech encrypting and deciphering system mapping based on frequency spectrum | |
| RU2433547C1 (en) | Method, apparatus and system for end-to-end encryption of voice data and transmission thereof over public communication networks | |
| EP2178235B1 (en) | Encryption of information signals |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160720 |
|
| RJ01 | Rejection of invention patent application after publication |