Method for defensing zero power consumption attack on code device

[0057] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0058] A method for defending against zero-value power consumption attacks on a cryptographic device, characterized in that GF(2 8 ) The inverse operation on the finite field uses GF(2 8 ) field additive masking inversion operation replacement, the specific process is as follows:

[0059] First in GF(2 8 ) on the finite field to perform the inverse operation, and use the superscript -1 to represent the inverse operation, specifically:

[0060] GF(2 8 ) signal data y on the domain is defined as {y 7 ,y 6 ,y 5 ,y 4 ,y 3 ,y 2 ,y 1 ,y 0}, where y i (0≤i≤7) is converted from decimal y to 8-bit binary coefficient corresponding to the i-th bit;

[0061] GF(2 4 ) signal data a on the domain is defined as {a 3 ,a 2 ,a 1 ,a 0}, where a i (0≤i≤3) is the coefficient corresponding to the i-th bit when the decimal a is converted into a 4-...