Process for storage and use of sensitive information in a security module and the associated security module
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United States of America Patent
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Dec 2, 2003
Grant Date -
N/A
app pub date -
Dec 11, 1998
filing date -
Mar 13, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to a process for storing and using sensitive information in a security module and to a security module arranged to implement the process, and protect the sensitive information against fraudulent utilization. The sensitive information ISj is stored in a form ISj encrypted using a temporary encrypting protection key CPi, whose content varies over time. The sensitive information ISj is decrypted before being used in a given operation, using a temporary decrypting protection key CPid. Before the contents of the encrypting and decrypting keys are varied, the sensitive information ISj is decrypted with the current decrypting key, and then it is re-encrypted with the new encryption key to obtain a new encrypted form, different from the previous one.
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