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Abstract

A generator for generating ciphering sequences, including plural clocked subgenerators (.GAMMA., .psi., .PSI.) which, in turn, generate binary sequences at one or several outputs. To achieve high cryptographic security of the ciphering sequence (.omega..sub.t) generated by the generator, n+1, at least three subgenerator are used in an arrangement in which the clock of n of these subgenerators (.psi., .PSI.) is controlled in each case by at least one of the outputs of the (n+1)th subgenerator (.GAMMA.) either directly or via function generators (.DELTA.f(t), .DELTA.f (t)) wherein the sequences (.mu.f(t), .mu. f(t)) generated by the n sub generators are logically combined by at least one function, which function assumes both binary states with approximately the same frequency when its arguments pass through all possible values.

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First Claim