Power Attack and Protected Implementation on Block Cipher BIG

BIG is a new Feistel structured block cipher. Compared with other block ciphers, in terms of hardware or software implementation, it has a wider range of usage scenarios and is optimized in terms of encryption/decryption, throughput-to-area ratio (TP/A). Although extensive research has been conducted on its theoretical security, almost no effort has been made to analyze its implementation security, such as side-channel attack protection. In this article, we first present related power attacks and their experiments on BIG. Then, for side channel attacks, a mask protection scheme for software BIG is proposed. Its implementation shows that the protected BIG only costs 120.6%, 187.1% and 106.5% of the code, time and RAM.