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Improved speech code flow enciphering Improved speech code flow enciphering method

A voice coding and stream encryption technology, applied in the field of improved voice coding stream encryption, can solve problems such as the loss is not worth the loss, the number of encrypted bits is discontinuous, the bits are discontinuous, etc. The effect of strong attack ability

Inactive Publication Date: 2011-12-14
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
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Problems solved by technology

Due to the selective encryption of G.723.1, the number of bits to be encrypted is discontinuous and uncertain (the number of bits to be encrypted is different for different security levels), and block encryption is to encrypt fixed-length plaintext, and the algorithm is relatively complicated. does not apply anywhere
The sequence encryption (stream encryption) method mainly adopts the XOR of the generated pseudo-random sequence and the plaintext to obtain the ciphertext, but the bits to be encrypted are not continuous. operation, the efficiency of this method is low, and the gain outweighs the gain

Method used

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Embodiment Construction

[0053] In order to make the purpose, technical solution and advantages of the present invention clearer, an improved speech coded stream encryption method of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0054] The improved speech coding stream encryption method of the present invention is described in detail below:

[0055] Comprehensively considering the characteristics, efficiency and security of speech coding encryption, the speech coding stream encryption method in the embodiment of the present invention adopts the chaotic stream encryption method, and the XOR operation takes bytes as the unit, and the key stream in the stream encryption method Repeated use, voice coding and encryption.

[0056] The advantages of stream encryption are smal...

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Abstract

This invention discloses a chaos-flow encryption method for improved phone coding streams, which utilizes exclusive-OR operation with byte as the unit and the method includes: taking one-dimension non-linear iteration method mapped by Logistics as the token, which is quicker than packeting method and stronger in anti-attack for ciphered keys and is more suitable for selectivity encryption to multimedia data.

Description

technical field [0001] The invention relates to the technical field of speech coding. In particular, it relates to an improved method for encrypting speech coded streams. Background technique [0002] With the rapid growth of communication service demands, in order to ensure the transmission of communication service data, people vigorously carry out the research work of various data compression technologies. The compressed digital transmission of voice signals has been the direction that people have been working hard for many years. [0003] The prior art generally adopts low-rate speech coding technology for speech transmission. Low-rate speech coding is to reduce the coding rate while minimizing distortion, so as to reduce the bandwidth occupied during transmission. Compared with analog transmission, it can save bandwidth and facilitate integration with the Internet (Internet Protocol, IP). [0004] G.723.1 is a voice coding standard formulated by the International Tel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L9/00H04L9/22H04K1/02G06N7/08
Inventor 王芙蓉何娟杨军
Owner HUAZHONG UNIV OF SCI & TECH
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