Chip authentication using scan chains

摘要

Methods and systems for generating a circuit identification number include determining a propagation time delay across a scan chain of known length; comparing the propagation time delay to a threshold associated with the scan chain length; storing an identifier bit based on the result of the comparison; repeating the steps of determining, comparing, and storing until a number of stored identifier bits reaches a threshold number; and outputting the stored identifier bits.

主权项

1. A method for generating an identifying number, comprising:
generating one or more identifier bits based on a propagation time delay across a scan chain of known length using a processor; and repeating said step of generating until a number of stored identifier bits reaches a threshold number.