Method for key diversification on an IC card
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United States of America Patent
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Feb 22, 2011
Issued Date -
N/A
app pub date -
Jun 29, 2007
filing date -
Jun 29, 2006
priority date (Note) -
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Abstract
Key diversification is performed during a mutual authentication between a SAM integrated circuit (IC) card storing a master key, and a user IC card storing an identification number. The user IC card is connected to the SAM IC card through a communications interface. The key diversification includes deriving sub keys from the master key, and computing ciphered strings through corresponding cryptographic computations on a string obtained by an elaboration on the identification number with the sub keys. A diversification key is generated by linking together a combination of bytes of the ciphered strings.
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