Correlation power analysis attack takes place at the point of operating a known value and a hidden value from a master key as an input. The hidden value can be found by analyzing a correlation between the result value and the measured power signal during the operation, witch makes it possible to estimate the master key from the hidden value. However, the correlation power analysis attack can be very difficult by changing the conditions that make the power analysis possible, when the known value and the operation is hidden, when it is impossible to estimate the master key from the hidden value, or when the correlation between the result value and the power signal is considerably lowered. Therefore this study proposes a software countermeasure using a secrete intermediate key to witch these conditions are applied.키워드 : 암호시스템, 전력분석공격, AES 공격, 소프트웨어 방어대책, 비밀 중간키 Key word : crypto system, power analysis attack, AES attack, software countermeasure, secrete intermediate key
Journal of the Korea Institute of Information and Communication Engineering
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