S-box hiding methods for AES hardware chips against differential power analysis based on composite field

AES has been widely used in cryptographic modules of many hardware devices such as communication chips or broadcasting receiver chips. AES may be theoretically safe; however, cryptographic device with it is vulnerable to side channel attacks such as differential power attacks due to leakage information. In this paper, we propose countermeasure techniques for AES hardware chips with S-box hiding using four different implementations of S-boxes using composite fields. We synthesized them and verified correlations roughly.