Method for authentication by an external medium of a portable object such as a memory card coupled to this medium
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United States of America Patent
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Oct 6, 1992
Issued Date -
N/A
app pub date -
Feb 7, 1991
filing date -
Jun 16, 1986
priority date (Note) -
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status (Latency Note)
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Abstract
A method for authentication by an external medium of a portable object such as a standardized credit card coupled to this medium. The portable object (2) calculates a result (R) which is at least a function of a secret key (S) and of a variable datum (E). This result (R) is sampled by the external medium (1), which compares it with a reference result (RO). This result (RO) is changed in a random manner, by being replaced by a new result (RO) calculated by a portable object (2) which has been authenticated based on the preceding reference result.
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