1. A system, comprising: a memory unit configured to store key data for a cryptographic processing; and a circuitry configured to: perform an encryption of the cryptographic processing or a decryption of the cryptographic processing over a plurality of rounds, wherein the encryption or the decryption includes: input, the key data stored in the memory unit, in each round of the plurality of rounds; transform, in a first round of the plurality of rounds, first input information into first nonlinear transformed information; transform, in the first round, the first nonlinear transformed information into first linear transformed information; transform, in a second round of the plurality of rounds, second input information into second nonlinear transformed information; transform, in the second round, the second nonlinear transformed information into second linear transformed information; and perform an exclusive-or operation on the second linear transformed information of the second round with the first input information of the first round.