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A METHOD FOR PROTECTING A SUBSTITUTION OPERATION USING A SUBSTITUTION TABLE AGAINST A SIDE-CHANNEL ANALYSIS
A METHOD FOR PROTECTING A SUBSTITUTION OPERATION USING A SUBSTITUTION TABLE AGAINST A SIDE-CHANNEL ANALYSIS
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机译：一种用替代表对侧通道分析保护替代操作的方法
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摘要
The invention relates to a method for executing by a circuit a substitution operation whereby an output data is selected in a substitution table using an input data as an index, wherein the substitution operation is performed using a new masked substitution table (SB1), the input data being combined by XOR operations with a new value of a first mask parameter (u1), and the output data being combined by XOR operations with a new value of a second mask parameter (v1), the new masked substitution table being generated by computing the new value of the first mask parameter by applying XOR operations to a previous value of the first mask parameter (u0) and to a first input mask (U); computing the new value of the second mask parameter by applying XOR operations to a previous value of the second mask parameter (v0) and to a second input mask (V), and generating the new masked substitution table using a previous masked substitution table (SB0) and the first and second input masks.
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