US 6097812
Cryptographic system
Assignee
NATIONAL SECURITY AGENCY
Filed
Jul 25, 1933
Granted
Aug 1, 2000
Location
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.
Source: Google Patents
35 USC §181 Secrecy Order
Imposed
Mar 12, 1982
Rescinded
Nov 5, 1999
Duration
17 years, 8 months
Record Details
- Patent number
- US 6097812
- Application
- 02682096
- Aerospace match
- No
- Dataset source
- 35 USC §181 SO records
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NATIONAL SECURITY AGENCYBack to patent indexSource: USPTO 35 USC §181 secrecy order records