Method for secretly writing and extracting secret information of compressed digital audio

Abstract

The invention discloses a method for secretly writing and extracting secret information of compressed digital audio, which is characterized by classifying all code words in each Huffman code table layer upon layer, then determining the base of all effective code words, and secretly writing data according to the base of the effective code words, wherein the base is larger, the amount of secretly written information is more, thus the secret writing capacity of the method is far larger than that of the prior binary mode secret writing method of which the base is 2; and selecting variable long code words of main data as objects for secretly writing the secret information, and achieving the modification of the variable long code words by replacing attributes corresponding to the long code words so that the code word length and the sign bits of the variable long code words after the modification can be kept unchanged with that of original variable long code words, thus the structure of an original audio code stream is not changed after secretly writing the secret information so as to avoid the problems of increasing the coding bit rate and changing the file length of the whole digital audio caused by secret writing operations, and effectively ensure the security for secretly writing the secret information.

Description

technical field [0001] The invention relates to a digital steganography method, in particular to a steganographic and extraction method for secret information in compressed digital audio. Background technique [0002] Since the early 1990s, information hiding technology, as an important topic in information security, has attracted the attention of international academic circles. Digital steganography is an important branch of information hiding technology. The purpose of digital steganography is to use digital objects with clear content, such as images, audio or video, as digital carriers to hide secret information in digital carriers, and require the steganography of secret information. The visual or auditory effect of the original digital carrier is not changed, and the file size and file format of the digital carrier are not changed at the same time, so that secret information can be transmitted through open channels in a way that does not attract the attention of the out...

AI Technical Summary

Problems solved by technology

This method uses binary as the basic system for writing, so only one bit can be embedded in each symbol modification, and the capacity of secret writing is limited

Other steganography methods write secret information by modifying the parameters in the frame information. These methods also use binary steganography, and this kind of steganographic method will cause the file length of the compressed digital audio to change, so that the compression Increased bit rate cannot effectively guarantee the security of digital steganography

Images