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A new class of physical attacks against cryptographic modules, called as Side-Channel Attacks (SCA) is a powerful technique to reveal secret keys of cryptographic devices. SCA tries to exploit specific properties of the implementation, operating environment such as timing, power or electro-magnetic analysis of a cryptosystem. This paper presents the timing based side-channel attacks in which the attacker tries to break a cryptographic algorithm by using information about the execution times of its encryption or decryption queries. In general, a timing attack watches data movement of the CPU and of memory, while an algorithm is running.
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