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论文类型：期刊论文

发表时间：2008-01-01

发表刊物：CHINESE JOURNAL OF ELECTRONICS

收录刊物：SCIE、EI

卷号：17

期号：1

页面范围：53-55

ISSN号：1022-4653

关键字：steganalysis; steganography; OPA (Optimal parity assignment) algorithm; RTS (Replacement-transfer structure)

摘要：Steganography is the art of transmitting a message by embedding it into multimedia data without drawing any suspicions. OPA (Optimal parity assignment) algorithm is one of the most secure steganographic methods for palette format images. In this paper, we present RT (Replacement transfer) steganalytic algorithm for detecting the secret messages embedded by OPA and the improved algorithm. Based on the analysis of Replacement-transfer structure (RTS) of colors, we explore the singular statistics of core colors in OPA stego-images via replacement operation. In addition, we can estimate statistics of the cover-image from the corresponding stego-image by an average filtering operation. With the estimation of statistics of the cover image and the singular statistics of the stego-image, the length of secret messages embedded in palette format images with OPA and the improved algorithm can be estimated. The experimental results indicate that the RT steganalytic algorithm is effective and accurate.