Process and apparatus for authenticating the signature of a signed message

Patent 4656474 Issued on April 7, 1987. Estimated Expiration Date:

November 20, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

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Inventors

Assignee

Compagnie Internationale pour l'Informatique Cii-Honeywell Bull

Application

No. 06/799300 filed on 11/20/1985

US Classes:

713/181, Message digest travels with message235/380, Credit or identification card systems340/5.81, Personal identification705/67, Including authentication713/172, Intelligent token902/3Evaluates biometrics

Examiners

Primary: Yusko, Donald J.

Attorney, Agent or Firm

Kerkam, Stowell, Kondracki & Clarke

International Classes

G07F 7/10 (20060101)
H04L 9/32 (20060101)

Foreign Application Priority Data

1981-10-09 FR

Abstract

A process and a device for authenticating the signature of a signed message includes a nominal signature card (1a) coupled to a transmitting device 1 which sends signed messages. The card (1a) includes at least one memory (5) in which there are secretly prerecorded at least one secret key (S) and one program (P) which automatically processes the signature of a message (M), as well as circuits (6) for computing the signature (SG). A control card (3b), which is not nominal, is coupled to a device (3) for receiving signed messages. The card (3b) includes at least one memory in which there are secretly prerecorded at least the secret key (S) and the program (P) for recomputing via processing circuits (15) the signature (SG) of the received message (M).