ARIA ENCRYPTION METHOD FOR COUNTERMEASURING HIGHER ORDER DPA

An ARIA(Academy Research Institute Agency) encryption method for counter-measuring a high order DPA is provided to improve a speed by applying a function calculation method only to a first round and the last round. A calculation process is performed by applying d mask values to an input plane text and a round key. A mask value calculation process is performed to calculate the mask values by updating Sbox in the substitution layer. A masking value calculation process is performed in a diffusion layer for composing a round function. The calculation process includes a process for generating random masks of R1 to Rd, a process for initializing an output values, RX to which the d random masks are applied, and a process for performing a masking calculation process for the input plain text and the round key.