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This paper investigates the role of user cooperation in facilitating secure wireless communications. In particular, the four-terminal relay-eavesdropper channel is introduced and analyzed. Several cooperation strategies are devised and the corresponding achievable rate-equivocation region are characterized. Of particular interest is the novel Noise-Forwarding (NF) strategy, where the relay node sends...
In this note we reconsider the code-based pseudo-random generator proposed by Fischer and Stern. This generator is proven as secure as the syndrome decoding problem but has two main drawbacks: it is slow (3000 bits/s) and a large size of memory is needed (88 kiloBytes). We propose a variation on the scheme which avoid them: the use of regular words speeds the system up and the use of quasi-cyclic...
We revisit the code-based identification protocol proposed by Stern at Crypto'93, and give evidence that the size of public keys can be dramatically reduced while preserving a high and well-understood level of security. More precisely, the public keys can be made even shorter than RSA ones (typically 347 bits), while their size is around 150 Kbits in the original scheme. This is achieved by using...
In this paper we discuss coding theorems for extensions of the information-theoretic stegosystem proposed by Cachin. We consider a stegosystem in which a covertext is generated from a general source. The variational distance between the probability distributions of a covertext and a stegotext is required to be negligible for ensuring validity as a stegosystem. We determine the maximum rate at which...
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