Timing Attack on Implementations of IDEA
Zhao Zheng-yang, O Box · Communications technology · 2010
It is generally believed that the security of cryptosystem mainly relies on the security of cryptographic algorithm used by the system. Attacks on cryptosystem are under the hypothesis that the adversary could only obtain information from I/O channel. However, in practice, the side-channel information(such as execution time etc.) could also be used to achieve attacks. Timing attack belongs to this kind. Timing Attack, through analyzing the information of execution time in the operations of cryptosystem, tries to recover the secret key. This paper proposes a timing-attack method against the implementations of IDEA and theoretically verifies the efficiency of the proposed method. Finally, it provides some countermeasures in resistance of such attack.