Circuit personalization
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United States of America Patent
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Feb 26, 2013
Grant Date -
Feb 1, 2007
app pub date -
Jul 31, 2006
filing date -
Jul 29, 2005
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A method distributes personalized circuits to one or more parties. The method distributes a generic circuit to each party, encrypts a unique personalization value using a secret encryption key, and transmits each encrypted personalization value to the corresponding party. Each party then stores the encrypted personalization value in their circuit. The stored encrypted personalization value allows a piece of software to be properly executed by the circuit. A semiconductor integrated circuit is arranged to execute a piece of software that inputs a personalization value as an input parameter. The circuit comprises a personalization memory arranged to store an encrypted personalization value; a key memory for storing a decryption key; a control unit comprising a cryptographic circuit arranged to decrypt the encrypted personalization value using the decryption key; and a processor arranged to receive the decrypted personalization value and execute the software using the decrypted personalization value.
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