公开(公告)号：US11258599B2

公开(公告)日：2022-02-22

申请号：US16793986

申请日：2020-02-18

Applicant: MACRONIX INTERNATIONAL CO., LTD.

Inventor： Chun-Hsiung Hung ,  Kuen-Long Chang ,  Ken-Hui Chen ,  Shih-Chang Huang ,  Chin-Hung Chang ,  Chen-Chia Fan

IPC: H04L9/08 ,  H04L9/32 ,  G06F21/62 ,  G06F3/06 ,  G06F12/0877

Abstract: 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.