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Article

A timing attack on CUDA implementations of an AES-type block cipher

Fomin D.

A timing attack against an AES-type block cipher CUDA implementa- tion is presented. Our experiments show that it is possible to extract a secret AES 128-bit key with complexity of 2^32 chosen plaintext encryptions. This approach may be applied to AES with other key sizes and, moreover, to any block cipher with a linear transform that is a composition of two types of linear transformations on a substate.