Method for certifying the authenticity of a datum exchanged between two devices connected locally or remotely by a transmission line

Patent 4907270 Issued on March 6, 1990. Estimated Expiration Date:

March 10, 2008. 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

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Inventor

Hazard, Michel

Assignee

Bull CP8

Application

No. 171427 filed on 03/10/1988

US Classes:

713/181, Message digest travels with message713/172Intelligent token

Examiners

Primary: Cangialosi, Salvatore

Attorney, Agent or Firm

Kerkam, Stowell, Kondracki & Clarke

International Class

H04L 009/00

Foreign Application Priority Data

1986-07-11 FR

Abstract

The subject of the invention is a method for certifying the authenticity of a datum exchanged between two devices connected locally or at long distance by a transmission line.The transmitting device (2) fashions an enciphered message (M) on the basis of a parameter (X) at least one field (X1) of which must satisfy a predetermined condition and one field (X3) corresponds to the datum (d) to be transmitted. The receiving device (1) deciphers the message (M) in order to find a parameter (X') the field (X'1) of which must satisfy the same condition as the field (X1) for which the field (X'3) corresponds to the datum (d) transmitted.The invention is applicable in particular to credit cards.