The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 28, 1989
Filed:
Oct. 15, 1986
Christoph-Georg Gunther, Fislisbach, CH;
BBC Brown, Boveri & Company, Limited, Baden, CH;
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.