How to construct random functions
Journal of the ACM (JACM)
Small-bias probability spaces: efficient constructions and applications
SIAM Journal on Computing
Introduction to Coding Theory
CRYPTO '02 Proceedings of the 22nd Annual International Cryptology Conference on Advances in Cryptology
An Information-Theoretic Approach to Steganography and Watermarking
IH '99 Proceedings of the Third International Workshop on Information Hiding
Number-theoretic constructions of efficient pseudo-random functions
Journal of the ACM (JACM)
An information-theoretic model for steganography
Information and Computation
IH'12 Proceedings of the 14th international conference on Information Hiding
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We provide a new provably-secure steganographic encryption protocol that is proven secure in the complexity-theoretic framework of Hopper et al. The fundamental building block of our steganographic encryption protocol is a “one-time stegosystem” that allows two parties to transmit one-time steganographic messages of length shorter than the shared key with information-theoretic security guarantees. The employment of a pseudorandom number generator (PRNG) allows the transmission of longer messages in the same way that such a generator allows the use of one-time pad encryption for messages longer than the key in symmetric encryption. The advantage of our construction compared to that of Hopper et al. is that it avoids the use of a pseudorandom function family and instead relies (directly) on a PRNG in a way that provides a linear versus constant improvement in the number of applications of the underlying (say) one-way permutation per bit transmitted. This advantageous trade-off is achieved by substituting the pseudorandom function family employed in the previous construction with an appropriate combinatorial construction that has been used extensively in derandomization, namely almost t-wise independent function families.