Perturbed quantization steganography with wet paper codes

In this paper, we introduce a new approach to passive-warden steganography in which the sender embeds the secret message into a certain subset of the cover object without having to share the selection channel with the recipient. An appropriate informationtheoretical model for this communication is writing in memory with (a large number of) defective cells [1]. We describe a simple variable-rate random linear code for this channel (the “wet paper” code) and use it to develop a new steganographic methodology for digital media files – Perturbed Quantization. In Perturbed Quantization, the sender hides data while processing the cover object with an information-reducing operation, such as lossy compression, downsampling, A/D conversion, etc. The sender uses the cover object before processing as side information to confine the embedding changes to those elements of the processed cover object whose values are the most “uncertain”. This informed-sender embedding and uninformed-recip...

• Type: Conference
• Year: 2004
• Where: MMSEC
• Authors: Jessica J. Fridrich, Miroslav Goljan, David Soukal
• Keywords: Cover Object, Embedding Changes, MMSEC 2004, Perturbed Quantization