Abstract An arrangement for generating a series of digital signals for use as a superimposition series in ciphering and deciphering digital signals. The arrangement comprises a contact matrix in which each contact can have two different conditions, ''''one'''' condition and ''''zero'''' condition. Said contacts are selected by a pseudorandom generator including a number of pulse generators corresponding to half the number of matrix points. Said generators generate individually a pseudorandom series of binary ''''ones'''' and ''''zeros'''' and each has two outlets of which the output signal of one outlet is inverted relatively to the output signal of the other outlet. All outlets are connected individually to a contact in the matrix, so that the number of contacts with zero condition always will be equal to the number of contacts with one condition.
Arrangement for generating a series of digital signals, for use upon generation of a superimposition series when digital signals are ciphered or deciphered, comprising a contact matrix in which each contact can have two different conditions, one condition and zero condition, stepping pulse generators selecting said contacts in a pseudorandom sequence, in order to define by their condition said series of digital signals, the arrangement including a pseudorandom generator arrangement having a number of pulse generators (PG1-PG8 or V1-V8) corresponding to half the number of matrix points which generators generate individually a pseudorandom series of binary ones and zeros and have each two outlets, of which the output signal of the one outlet is inverted relatively to the output signal of the other outlet, and that all outlets are connected individually to a contact (a11-a44) in the matrix (M), so that the number of contacts with zero condition always will be equal to the number of contacts with one condition.
Claim 2
Dependent Claim
160 words
Arrangement for generating a series of digital signals, for use upon generation of a superimposition series when digital signals are ciphered or deciphered, comprising a contact matrix in which each contact can have two different conditions, one condition and zero condition, stepping pulse generators selecting said contacts in a pseudorandom sequence, in order to define by their condition said series of digital signals, the arrangement including a pseudorandom generator arrangement having a number of pulse generators (PG1-PG8 or V1-V8) corresponding to half the number of matrix points which generators generate individually a pseudorandom series of binary ones and zeros and have each two outlets, of which the output signal of the one outlet is inverted relatively to the output signal of the other outlet, and that all outlets are connected individually to a contact (a11-a44) in the matrix (M), so that the number of contacts with zero condition always will be equal to the number of contacts with one condition.
Claim 3
Dependent Claim
42 words
Arrangement according to claim 1, in which a permuting circuit (P) is connected between the outlets of the pseudorandom generator arrangement and the matrix points, which permuting circuit makes it possible for each outlet to be connected to an arbitrary matrix point.