Method for certifying the authenticity of a datum exchanged between two devices connected locally or remotely by a transmission line
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United States of America Patent
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-
Mar 6, 1990
Grant Date -
N/A
app pub date -
Mar 10, 1988
filing date -
Jul 11, 1986
priority date (Note) -
Expired
status (Latency Note)
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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.
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