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:
Aug. 01, 2000
Filed:
Jul. 25, 1933
Applicant:
Inventor:
William F Friedman, Washington, DC (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04L / ; H04L / ; H04L / ; H04L / ;
U.S. Cl.
CPC ...
380 26 ; 380287 ; 380 52 ; 380 56 ; 380 57 ; 380 59 ; 341 50 ; 341 90 ; 341 91 ;
Abstract
The crytographic system automatically and continuously changes the cipher equivalents representing plaintext characters so as to prevent any periodicity in the relationship. The system has a series of juxtaposed, rotatable, connection changing mechanisms to provide a large number of alternative paths for the passage of an electric current corresponding to a message character. Further, the system has parts for the irregular and permutative displacements of the members of a set of circuit changing mechanisms to thwart cryptanalysis.