Enhanced Correlation Power Analysis Using Key Screening Technique

An enhanced CPA (correlation power analysis) attack which screens key candidates using correlation levels and ranking is proposed in this paper. An AES circuis is implemented on a Xilinxreg FPGA on SASEBO (side-channel attack standard evaluation board) specifically designed for side-channel attack experiments, and the proposed attack is performed and compared to the standard CPA. As a result, the key screening technique successfully reduces the calculation time for handing 5,000 power traces by 26%. In addition to the accelerated computation, the accuracy of the key estimation is also improved.