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cs.CR2022
Entropically secure cipher for messages generated by Markov chains with unknown statistics
Boris Ryabko
In 2002, Russell and Wang proposed a definition of entropically security that was developed within the framework of secret key cryptography. An entropically-secure system is uncond…
cs.CR2016
Information-Theoretical Analysis of Two Shannon's Ciphers
Boris Ryabko
We describe generalized running key ciphers and apply them for analysis of two Shannon's methods. In particular, we suggest some estimation of the cipher equivocation and the proba…
cs.CR2006
Provably Secure Universal Steganographic Systems
Boris Ryabko, Daniil Ryabko
We propose a simple universal (that is, distribution--free) steganographic system in which covertexts with and without hidden texts are statistically indistinguishable. The stegosy…