Speech LPC hiding and extraction algorithm based on filter similarity

Abstract

The invention uses a speech media as a carrier object for speech information hiding and extraction, utilizes the information secret characteristic of information hiding, combines the characteristic ofspeech coding, designs a secret speech information hiding and extraction algorithm, establishes a speech subthreshold channel and realizes a novel real-time speech secret communication mode. The inve ntion comprises the following contents: (1), providing a filter similarity concept and also providing a corresponding definition and a corresponding quantitative calculation method of a filter for determining a speech code LPC parameter used for hiding secret speech information; and (2), providing a speech LPC hiding and extraction algorithm based on filter similarity. After secret speech is embedded into carrier speech, the quality of the carrier speech is not reduced obviously, and the embedded secret speech information can not be detected. Under the condition that the communication rate is ensured, the algorithm can provide enough hiding capacity to ensure the continuity of communication speech and can greatly reduce the code rate.

Description

technical field [0001] The invention is a core algorithm used in a secret communication system for secret voice real-time communication. The invention can be loaded on the general voice signal processing module, and carry out real-time covert communication of secret voice through the public switched communication network (public switched telephone network PSTN, video conferencing network, VoIP network or mobile communication GSM and CDMA network). The invention belongs to the technical field of Information Hiding in the field of computer technology and network security. Background technique [0002] Since the first international conference on information hiding technology was held in 1996, the theory, method and application research of information hiding have been paid more and more attention. With the continuous development of information hiding technology, it has been adopted by many application fields as a new information security technology. Many academic institutions ...

AI Technical Summary

Problems solved by technology

[0030] Insufficient LSB algorithm: extremely poor resistance to channel interference and data manipulation

[0085] The advantage of the transform domain algorithm is: it has strong robustness, and can obtain excellent hiding effect; but its disadvantage is: the hidden capacity is small, suitable for hiding a small amount of secret data

For information hiding systems that require a large hiding capacity, it is difficult for this type of algorithm to meet the required hiding capacity requirements

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