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When implementing cryptographic algorithms in mobile devices li ke smart cards, the security against side-channel attacks should be considered. Side-channel attacks try to find critical information from the side-channel infromation obtained from th e underlying cryptographic devices‘ execution. Especially, the power analysis attack uses the power consumption profile of the devices as the side-channel information. This paper proposes a new gate-level countermeasure against the power analysis attack and the glitch attack and suggests how to apply the measure to securely implement AES.Keywords: Smart Card, Side-Channel Attack, Power Analysis Attack, Glitc h Attack, Countermeasure, AES(2013 12 26), (2014 1 21), (2014 1 29)*   ETRI  K-SCARF   (       )†, yoojin.baek@gmail.com‡, dhchoi@etri.re.kr (Corresponding author) I.                                 .              .

Second-Order G-equivariant Logic Gate for AND Gate and its Application to Secure AES Implementation