公开(公告)号：US20240089097A1

公开(公告)日：2024-03-14

申请号：US17941515

申请日：2022-09-09

Applicant: RENESAS ELECTRONICS CORPORATION

Inventor： Takahiko SUGAHARA ,  Yuichi IWAYA ,  Akira HAMAGUCHI

IPC: H04L9/08 ,  H04L9/14 ,  H04L9/32

CPC classification number: H04L9/0891 ,  H04L9/0894 ,  H04L9/14 ,  H04L9/3226

Abstract: When the external storage itself is replaced by a legitimate old key by a malicious third party, the security IP cannot recognize that it is the old key and can be easily rolled back, that is, the old key is regarded as the legitimate key and operates. An OTP is provided in the SoC, and the version of the key ring is managed in one control table area. Specifically, predetermined information that is updated in synchronization with the key update is written in the management table area of the OTP, and an authentication value is calculated by associating the predetermined information with a key ring including the update key. The calculated authentication value is added and registered when registering the key ring.

公开(公告)号：US20230254114A1

公开(公告)日：2023-08-10

申请号：US18059139

申请日：2022-11-28

Applicant: RENESAS ELECTRONICS CORPORATION

Inventor： Takahiko SUGAHARA

IPC: H04L9/06 ,  G06F21/72

CPC classification number: H04L9/0618 ,  G06F21/72

Abstract: A semiconductor device and a control method thereof capable of satisfying both security requirements and functional safety requirements while suppressing an increase in the circuit scale. The semiconductor device includes: a first encryptor having a first encryption processing unit that performs encryption process on plaintext data input from the outside to generate the first encryption data; a first decryptor having a first decryption processing unit that performs decryption processing in synchronization with an encryption process in the first encryption device to generate the first decryption data for the first encryption data generated in the first encryptor; a comparator that compares the plaintext data with the first decrypted data corresponding to the plaintext data; and a control unit that performs failure determination for the first encryptor and the first decryptor based on the comparison result by the comparator.