Cryptographic apparatus and method for protecting secret key against scan based side channel attack

摘要

A cryptographic apparatus and method for preventing a scan-based side channel attack is disclosed. The user key and the false key are stored in the key storage unit. The AES core part encrypts the plaintext based on the input key and outputs the ciphertext. The multiplexer selectively provides the user key and the false key to the AES core unit. The TAP control unit controls the multiplexer to provide the AES core unit with the false key if the operation mode of the AES core unit is the scan test mode. According to the present invention, since a separate register for storing data to be applied is not used in place of a user secret key in a scan test, it is possible to reduce area overhead and power overhead, It is possible to increase the reusability of the IP core.;AES, security, key protection, scan test, system-on-chip