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The Research on Information Hiding in Compressed Audio

Author: ZhangLiGuang
Tutor: WangRangDing
School: Ningbo University
Course: Signal and Information Processing
Keywords: Information Hiding MP3 Quantization and coding VLC codeword
CLC: TN919.8
Type: Master's thesis
Year: 2009
Downloads: 47
Quote: 1
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Abstract

With the rapid development of the Internet and multimedia technology , multimedia communications become an important means for people to exchange information , the security and confidentiality of the information has become increasingly important . Information hiding technique is considered to be one of the most effective way to address multimedia information security issues , audio as the carrier of information hiding technology into the original domain audio information hiding its vector format and compressed -domain audio information hiding . In practical applications, the audio transmission and storage are in a compressed format , the compressed -domain audio information hiding having a greater practical significance . This article focuses on the encoding format , MP3 audio information hiding technology research , research mainly includes the following aspects: ( 1 ) in-depth analysis of the principle of MP3 encoding standard , which focuses on analysis of the sub-band filter bank , MDCT transform , psychoacoustic model to quantify five important part of the coding and bit stream format . 2 summarizes the existing compressed-domain audio information hiding method and three categories: hiding method based on time-frequency conversion , HIDE based on quantization and encoding method based on a bit stream according to its embedded position in the encoding process , the type of framing Hide method . Two hiding method based on the quantization and coding . The first is to use MP3 quantization noise control link and psychoacoustic model repeated until there is no distortion embedding information on the quantized MDCT coefficients , the method of embedding capacity and imperceptibility . The second is from the the imperceptible and security point of view to consider , modify the quantization step in the quantization process to embed the information , the method similar to MP3Stego algorithm , but all aspects of the performance is better than MP3Stego . 4 hiding method based on the bit stream , the method is to replace each other by a the two codeword length and the symbol bit length equal to the VLC codeword to embed information . In order to further improve the embedding capacity , two improved methods , the first one is the first codeword pair with each other , so that an increase in the code word can be replaced . Another is from the original replacement substitution between the two codewords is extended between the plurality of code words , so that each replacement of a codeword can be embedded in a number of bits , thus greatly improving the embedding capacity .

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