Offline self-test architecture for the inversion operation of advanced encryption standard

An, offline fault detection strategy for the finite field inversion operation of Advanced Encryption Standard (AES) is presented in this paper. The AES inversion units are stimulated using conventional Test Pattern Generation methods and the results´ correctness is evaluated by means of signature analysis. The proposed architecture rely on connecting several inversion operation together in order to reduce the area overhead of the detection circuitry. The bytes of the AES state matrix are permuted sequentially in order to propagate the potential effect of a defect and reduce the number of signature registers required for detecting the presence of the defect. The proposed design is proved to represent an efficient test architecture by experimental results.