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Off-By-One Implementation Error in J-UNIWARD. (arXiv:2305.19776v1 [cs.CR])
cs.CR updates on arXiv.org arxiv.org
J-UNIWARD is a popular steganography method for hiding secret messages in
JPEG cover images. As a content-adaptive method, J-UNIWARD aims to embed into
textured image regions where changes are difficult to detect. To this end,
J-UNIWARD first assigns to each DCT coefficient an embedding cost calculated
based on the image's Wavelet residual, and then uses a coding method that
minimizes the cost while embedding the desired payload. Changing one DCT
coefficient affects a 23x23 window of Wavelet coefficients. To speed …
cost detect end error images implementation jpeg messages popular secret steganography