Anti vocoder compressed end-to-end voice encryption device and method

Abstract

Being related to end-to-end safety comm area in global mobile comm system, concretely the invention is related to end-to-end speech sound encryption unit and method of anti vocoder compression realized on traditional voice channel of GSM mobile comm system. The encryption unit is composed of encryption module at sending end and decryption module at receiving end. The encryption module at sending end includes compression module in low code rate (CMLCR) 4, an encryption module, orthogonal multicarrier modulation module (OMMM) 6, first carrier wave generator module (CWGM), first key management negotiation module (KMNM) 8, and first sync module. Decryption module at receiving end includes OMMM 14, second CWGM, decryption module, CMLCR 17, KMNM 18, and second sync module. Through GSM speech sound channel, the invention carries out end-to-end speech sound encryption transmission. Advantages are low time delay, high security, and flexible and convenient.

Description

technical field [0001] The present invention relates to the field of end-to-end secure communication in the Global System of Mobile Communication (GSM, Global System of Mobile communication), in particular to an end-to-end voice compression-resistant vocoder implemented on the traditional voice channel of the GSM mobile communication system Encryption device and method. Background technique [0002] GSM is a cellular mobile communication standard based on time-division multiple access mode formulated by the International Telecommunication Union Standardization Organization. It can provide services such as voice, data, short message and wireless Internet access. It was first applied in Europe and my country and achieved great success. At present, China's GSM network has covered most of the cities and towns in the country, and has become an important means of communication for all walks of life in the national economy. [0003] With the rapid development of the GSM network, a...

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Problems solved by technology

However, the data channel encrypted voice transmission has the following disadvantages: a) the problem of excessive delay caused by establishing a connection and using an automatic retransmission mechanism cannot be overcome; b) there is a problem of interoperability of the data channel between mobile networks in various regions; c ) The data channel method needs to open data services in the operator, and the existing phone card packages and other services cannot be used at both ends

A new speech encryption method for anti-vocoder compression of speech channels has not yet found any published patents

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