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Journal Articles EURASIP Journal on Information Security Year : 2015

Steganalysis of JSteg algorithm using hypothesis testing theory

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Abstract

This paper investigates the statistical detection of JSteg steganography. The approach is based on a statistical model of discrete cosine transformation (DCT) coefficients challenging the usual assumption that among a subband all the coefficients are independent and identically distributed (i. i. d.). The hidden information-detection problem is cast in the framework of hypothesis testing theory. In an ideal context where all model parameters are perfectly known, the likelihood ratio test (LRT) is presented, and its performances are theoretically established. The statistical performance of LRT serves as an upper bound for the detection power. For a practical use where the distribution parameters are unknown, by exploring a DCT channel selection, a detector based on estimation of those parameters is designed. The loss of power of the proposed detector compared with the optimal LRT is small, which shows the relevance of the proposed approach.

Dates and versions

hal-02362391 , version 1 (13-11-2019)

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Tong Qiao, Florent Retraint, Rémi Cogranne, Cathel Zitzmann. Steganalysis of JSteg algorithm using hypothesis testing theory. EURASIP Journal on Information Security, 2015, 2015 (2), ⟨10.1186/s13635-015-0019-7⟩. ⟨hal-02362391⟩
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