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A steganographic method on AAC (Advanced Audio Coding), the audio format of MPEG-2 and MPEG-4, is proposed. The data to be hidden are first encrypted and then embedded into AAC bit stream. The data embedding takes places at the heart of the AAC encoder, and each bit of the hidden data is encoded as the parity of the number of bits used for Huffman and differential coding in a frame of the AAC bit...
An information hiding method on escape sequences of Huffman coding which can embed a great deal of secret information into AAC files is proposed based on the research of AAC coding standard. The proposed algorithm first unpacks the cover AAC file to search for the escape sequences, and then modifies least significant bit (LSB) of the escape sequences with the approach of matrix encoding, to improve...
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