Key transformation unit for an IC card
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United States of America Patent
Stats
-
May 7, 2002
Grant Date -
N/A
app pub date -
May 11, 1998
filing date -
May 15, 1997
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A multi-application IC card system and method is disclosed providing a secure data transmission technique. The method is used, for example, to load an application from an application provider, which could be remote, to an IC card. At least a portion of the application is encrypted using a transfer key. The transfer key is then encrypted using the public key of a public/secret key pair of the intended IC card to form a key transformation unit. The encrypted application and key transformation unit are then sent to the IC card and the IC card decrypts the key transformation unit using its secret key. The transfer key is then recovered and used to decrypt the encrypted application. The application can then by stored on the IC card and accessed by the card user.
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