Abstract
PIPO is a lightweight block cipher and shows better performance than other block cipher algorithms on low-end microcontrollers (e.g. 8-bit AVR). In addition, PIPO block cipher can utilize the efficient masking method by minimizing the number of non-linear operations. Therefore, PIPO block cipher can prevent side-channel attacks, efficiently. In this paper, we propose an efficient first-order masking technique using a 2-byte random mask by taking an advantage of PIPO block cipher. We present a new OR operation masking technique. Among functions of PIPO, the masked S-layer with 23 AND operations, 5 OR operations, and 46 XOR operations is used. Operations of PIPO block cipher are implemented in AVR assembly languages. The proposed implementation showed 1.5\(\times \) faster performance enhancements compared to the unprotected C implementation in the encryption process and 2.2\(\times \) faster performance enhancements compared to the unprotected optimized assembly implementation.
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