Enciphered communication system

Details Enciphered communication system Enciphered communication system

1994-12-29

1996-11-12

Gregory, Bernarr E.

Cryptography

Equipment test or malfunction indication

380 9, 380 21, 380 49, H04L 900

Patent

active

055747850

ABSTRACT:
An enciphered communication system is provided which has a plurality of cipher keys selectively used for enciphering data, wherein even when a cipher key number used at a transmitting side is not correctly transmitted to a receiving side, the receiving side can change the cipher key to a correct one. A transmitter has appendant data affixing means for affixing appendant data to information to be enciphered, and a receiver has appendant data detecting means for detecting the appendant data from deciphered data, and cipher key determining means for successively changing the cipher key of the receiver when the appendant data is not accurately detected. Consequently, when the cipher key is changed, for example, the receiving side itself can restore data even if the cipher key number is not correctly transmitted thereto.

REFERENCES:
patent: 3244806 (1966-04-01), Morris
patent: 3466385 (1969-09-01), Hendrickson
patent: 3538242 (1970-11-01), Hepner
patent: 5297208 (1994-03-01), Schlafly et al.
patent: 5392352 (1995-02-01), Han
patent: 5432848 (1995-07-01), Butter et al.

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