Haynes Beffel & Wolfeld LLP
Stable physically unclonable function
A system and method use a physical unclonable function in a PUF circuit on an integrated circuit to generate a security key, and stabilize the security key by storage in a set of nonvolatile memory cells. The stabilized security key is moved from the set of nonvolatile memory cells to a cache memory, and utilized as stored in the cache memory in a security protocol. Also, data transfer from the PUF circuit to the set of nonvolatile memory cells can be disabled after using the PUF circuit to produce the security key, at a safe time, such as after the security key has been moved from the set of nonvolatile memory cells to the cache memory.
MACRONIX INTERNATIONAL CO., LTD.
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Chen-Chia Chun-Hsiung Ken-Hui Kuen-Long Shih-Chang Chin-Hung
Fan Hung Chen Chang Huang Chang