Method of securely loading commands in a smart card
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United States of America Patent
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-
Jun 6, 2000
Grant Date -
N/A
app pub date -
Mar 28, 1997
filing date -
Mar 29, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method of securely loading and validating commands (COM) in a smart card (SC) is disclosed. Especially in the case where application-specific commands are loaded by an application provider (AP), that is off-line with respect to the card issuer (CI), it must be ensured that the commands are valid. The invention provides a method involving the protection of the commands (COM) by means of authentication codes, these codes (MAC1, MAC2) being produced using two different keys: one key (K1) is stored by the card issuer (CI), the other (K2) by a trusted third party (TTP). A further authentication code (MAC3), produced using a key from a set of keys (K3*), may be utilized to selectively validate commands for individual applications (e.g. AP1, AP2).
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