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Multiple Messages Embedding Using DCT-Based Mod4 Steganographic Method
Description
This paper proposes an extension of DCT-based Mod4 steganographic method to realize multiple messages embedding (MME). To implement MME, we utilize the structural feature of Mod4 that uses vGQC (valid group of 2 ×2 adjacent quantized DCT coefficients) as message carrier. vGQC's can be partitioned into several disjoint sets by differentiating the parameters where each set could serve as an individual secret communication channel. A maximum number of 14 independent messages can be embedded into a cover image without interfering one message and another. We can generate stego images with image quality no worse than conventional Mod4. Results for blind steganalysis are also shown.
