Multi-channel time-frequency fusion attacks Online publication date: Mon, 06-Sep-2021
by Yuchen Cao; Yongbin Zhou; Hailong Zhang
International Journal of Information and Computer Security (IJICS), Vol. 16, No. 1/2, 2021
Abstract: Side-channel analysis (SCA) is one of the most powerful attacks against cryptographic implementations. Multi-channel fusion attack (MCFA) which can utilise leakages measured from different side channels is a new type of SCA. Till now, existing MCFAs mainly work in the time domain. This paper take time-frequency joint information into consideration, and proposes time-frequency fusion attacks (TFFA). TFFA can be easily expanded to multi-channel case, and this kind of attack is named multi-channel time-frequency fusion attack (MCTFFA). In comparison to existing MCFAs, TFFA and MCTFFA are more effective. Practical experiments against unprotected AES-128 (implemented on MCU and FPGA) and masked AES-128 (implemented on FPGA) show that proper MCTFFA can reduce the number of traces needed to achieve a success rate of 1 by 23% to 60%, compared to that of MCFA. These improvements can be achieved without overhead in measurement complexity.
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