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Perfectly balanced functions were introduced by Sumarokov in . A well known class of such functions are those linear either in the first or in the last variable. We present a novel technique to construct perfectly balanced functions not in the above class.
In the present paper we study properties of perfectly balanced Boolean functions. Based on the concept of Boolean function barrier, we propose a novel approach to construct large classes of perfectly balanced Boolean functions.
We propose a novel efficient cryptanalytic technique allowing an adversary to recover an initial state of filter generator given its output sequence. The technique is applicable to filter generators possessing local affinity property.
The algebraic method for stream-cipher key recovering was developed in . The essence of this method is in solving the system of nonlinear equations which are the simplified consequences of the enciphering equations. The different questions on this method were investigated in [5, 6, 7]. We are using the group-theory methods for justification of algebraic… (More)