Method of transferring a secret, by the exchange of two certificates between two microcomputers which establish reciprocal authorization
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United States of America Patent
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Jun 8, 1993
Issued Date -
N/A
app pub date -
Jun 11, 1991
filing date -
Sep 7, 1987
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
According to the invention, the chip card issues a first certificate comprising its letter of credentials (Crc), an exponential (X), an optional message (M), these quantities being signed. The security module verifies the signature and in return issues a second certificate containing its letter of credentials (Crm), an exponential (Y), an optional message (M'), a cryptogram (C), these quantities being signed. A common secret key is constituted between the card and the security module by the exponentials and allows the card to interpret the cryptogram addressed to it and to act in accordance therewith.
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