In this paper we experimentally investigate the efficiency of concurrent checking for the AES encryption algorithm (Rijndael) by parity modification according to [3]. Also we propose a simple new BIST method. For BIST the implementation of the AES algorithm itself is used as well as a pseudo-random test input generator and a compactor of the test results. Thereby we utilized the property of the AES algorithm that arbitrarily given plain texts are encrypted by the successive rounds into "pseudo-random" cipher texts which are the (test) inputs for the next round.The complete data path of the AES algorithm is simulated as a netlist of AND-, NAND-, OR-, NOR-and XORgates. All possible single stuck-at faults are injected and simulated. For a special implementation of the S-boxes all errors within the data path of the AES algorithm due to single stuck-at faults are immediately detected.
In this paper a new self-checking multiplier which consists of an AND-matrix, a carry-save adder and a final sumbit duplicated adder is proposed. The AND-matrix and the carry-save adder are parity checked. All errors due to single stuck-at faults in the combinational part and all even or odd (soft) errors in one of the duplicated output registers are detected. The parity checked carry-save adder is implemented by use of carry-dependent sum adder cells with a single carry-out signal. Compared to a corresponding multiplier without error detection the necessary area is about 125% to 135%.
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