Attacking AES-masking encryption device with correlation power analysis

Abstract

Cryptography is the science and art of hiding and securing information. There is a new vulnerability in a cryptographic algorithm implemented on a hardware device. This vulnerability is considered capable of uncovering secret key used in a cryptographic algorithm. This technique is known as Side channel attack (SCA). Previous and other research introduces countermeasure to countering this new vulnerability. Some researchers suggest using logic level with encoding the AES. The countermeasure using logic is very low cost and efficient. The contribution of this paper is to analyze CPA on encryption device that has been given logic level countermeasure. Our finding of this paper is the use of encoding with one-hot masking technique does not provide the maximum countermeasure effect against CPA-based attacks. In this research CPA attack can be successfully revealing the AES secret-key.