This should be fairly interesting for listmembers.
United States Patent 6,097,812
Friedman August 1, 2000
Cryptographic system
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.
Inventors: Friedman; William F. (Washington, DC)
Assignee: The United States of America as represented by the National
Security (Washington, DC)
Appl. No.: 682096
Filed: July 25, 1933
URL: (Copypasted. May look horrible).
http://164.195.100.11/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=/netahtml/search-adv.htm&r=1&f=G&l=50&d=PALL&p=1&S1=('National+Security'.ASNM.)&OS=AN/"National+Security"&RS=AN/"National+Security"
Yours
>>Bevar naturen: Sylt et egern.<<
>>URL: http://www.datashopper.dk/~boo/index.html<<
>>ECHELON URL:<<
>>http://www1.ekstrabladet.dk/netdetect/echelon.iasp<<
