Efficient steganography algorithm combining wet paper codes and syndrome-trellis codes
一种融合湿纸码和STC码的高效隐写算法

In order to improve the embedding efficiency, this paper proposed a new steganography algorithm combining the wet paper codes and syndrome-trellis codes. It embeded the first part secrets into the least significant bits of the cover by syndrome-trellis codes. Pixels changed by STC were labeled "dry", others "wet".Then it used wet paper codes to reserve the STC result, guaranteed the "wet" pixels unchanged, and chose the modification mode for "dry" pixels. The modification modes took the second part secrets. The receiver extracted the secrets from the least significant bits and the hypo-least significant bits. Theoretic analysis and experiment result show that with the same distortion, the proposed algorithm has higher embedding efficiency and embedding rate. This algorithm can be used to kinds of covers, and its security performance is better than the steganography methods only used STC.