An information hiding method in advanced audio coding(AAC)

The problem of information hiding has been studied since 1990′s.Based on describing the coding-decoding process of AAC and the general ideas of hiding in AAC,a hiding idea of using the relationship between Huffman codebook selection and statistic properties of quantified values in frequency domain is proposed,and the process of information hiding and extracting is also described.The availability of the idea is proved by an experiment of hiding 526 bits in an AAC compressed audio signal of 3 seconds.Some present hiding detection methods are limited to adapt this idea.