In this paper, the Chinese block cipher algorithm SM4 is evaluated as a algebraic cryptanalysis method. As a result of the analysis, it was found that 12519 equations with 2 36 unknowns for 21 rounds of SM4 algorithm. And solve complexity of system of these equations is equivalent to 2 108....

SM4 is extensively utilized in WLAN WAPI resource-constrained devices. This study introduces an 8-bit iteration structure for SM4 at an ultra-low cost, where key expansion and encryption alternate with only one S-Box. Additionally, to reduce area usage, an on-the-fly key expansion mechanism is...