Uniform permutation privacy system

Details Uniform permutation privacy system Uniform permutation privacy system

1977-04-11

1978-07-11

Birmiel, Howard A.

Telegraphy

Systems

Printing

179 15R, 178 22, H04K 106

Patent

active

041003748

ABSTRACT:
A privacy communication arrangement temporally rearranges an intelligence signal to produce an uncorrelated scrambled signal. The intelligence signal is sampled at a predetermined rate and the samples are divided into groups of N successive samples. Each N successive sample group is uniformly permuted by transposing the i.sup.th sample (i = 1, 2, . . . , N) to the K.sub.1 i.sup.th (modulo N) sample position, where K.sub.1 is an integer prime with respect to N. The uniformly permuted group is transformed into the N successive sample group by transposing the j.sup.th sample of the permuted group to the K.sub.2 j.sup.th (modulo N) sample position.

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patent: 3970790 (1976-07-01), Guanella

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