Data Hiding in MPEG Compressed Audio Using Wet Paper Codes

Abstract

In this paper a novel data hiding scheme for MPEG compressed audio is proposed. It exploits wet paper codes as the communication channel and hides data directly in the MPEG audio bit stream by modifying the MPEG audio quantization process. It is applicable to all three layers of MPEG audio. Experimental results show that the proposed method is sustainable against transcoding and re-encoding without degrading the audio quality or increasing the file size.

The Sign Bits of Huffman Codeword-Based Steganography for AAC Audio

“…At present, most of the steganographic algorithms for compressed audio, such as using the modified discrete cosine transform (MDCT) coefficients at low frequency to hide secret information [2] , modifying terminating condition of the inner loop in MP3 encoding to achieve steganography [3] , adjusting the parity of quantization step to hide secret data [4] , the modulation of quantization step based on wet paper coding strategy [5] and the like, are based on the MP3. Nevertheless, as a new generation of audio compression technology, AAC has higher compressed ratio than MP3, and may become the most popular compression coding technology instead of MP3.…”