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Additional info for A Steganographic Embedding Undetectable by JPEG Compatibility Steganalysis

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If it is, then the strictness annotation forces x to be reduced to weak head normal form before the application (id x) may be expanded. Because x cannot be brought into weak head normal form, (id x) cannot be reduced at all, and the proof sketched above becomes invalid. This effect actually occurs quite frequently, which is a big nuisance. It causes many previously valid proof steps to become invalid, and therefore requires the proofs themselves to be revised. Fortunately, this revision is often easily realized.

G. Gonthier, M. -J. L´evy. Linear logic without boxes. In Proceedings of the 7th IEEE Symposium on Logic in Computer Science (LICS’92), pages 223–234. IEEE Press, 1992. 9. Y. Lafont. Interaction nets. In Proceedings of the 17th ACM Symposium on Principles of Programming Languages (POPL’90), pages 95–108. ACM Press, Jan. 1990. 10. Y. Lafont. From proof nets to interaction nets. -Y. Girard, Y. Lafont, and L. Regnier, editors, Advances in Linear Logic, number 222 in London Mathematical Society Lecture Note Series, pages 225–247.

Pj → Q) . )] (note that i and j can be zero for no top-level quantors or implications, making the form universal): 1. Collect as many known equalities as possible in the set Eq as follows: – for all 1 ≤ i ≤ n, if Hi states e1 = e2 , then add (e1 = e2 ) to Eq; – for all 1 ≤ j ≤ n, if Pj states e1 = e2 , then add (e1 = e2 ) to Eq; – if Q states ¬(e1 = e2 ), then add (e1 = e2 ) to Eq. Note that ¬Q can be used as a hypothesis here, because Q and (¬Q → False) are logically equivalent. 2. Collect as many known inequalities as possible in the set Eq as follows: – for all 1 ≤ i ≤ n, if Hi states ¬(e1 = e2 ), then add (e1 = e2 ) to Eq; – for all 1 ≤ j ≤ n, if Pj states ¬(e1 = e2 ), then add (e1 = e2 ) to Eq; – if Q states e1 = e2 , then add (e1 = e2 ) to Eq.

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A Steganographic Embedding Undetectable by JPEG Compatibility Steganalysis by Newman, Moskowitz, Chang, Brahmadesam


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