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A Boolean function is k-normal if it is constant on a k-dimensional flat of its domain. This paper demonstrates that k-normality of a Boolean function can be exploited to mount a dedicated algebraic attack on a stream cipher of the nonlinear filter generator type, which employs a k-normal Boolean function as its filter function. The cryptanalysis is based on the possibility for pre-computing a table...
An authentication protocol is proposed which originates from the elements of the authentication protocols belonging to the HB-family and the protocols based on employment of pseudorandom number generators. Desired features of the proposed protocol have been achieved via combining the pseudorandomnes generated by a compact keystream generator, randomness and dedicated homophonic and error-correction...
In this paper, a general framework which enables to compare previously proposed block decoding approaches for the fast correlation attack is developed. All attacks are based on decoding using a set of parity check sums of an underlying linear code. The purpose of this paper is twofold: 1) to provide a simple close form estimate about the number of check sums of a particular structure necessary for...
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