Patent ID: 8031866

Claim:
A security decryption processing system, comprising: a processor; and a memory storing a program that when executed by the processor: transforms, by a first decryption processing section, input information into first nonlinear information and the first nonlinear information into first linear information; transforms, by a second decryption processing section, the input information into second nonlinear information and the second nonlinear information to second linear information; performs an XOR operation based on the first linear information and the second linear information; and outputs a result of the operation, wherein if the first nonlinear information is expressed as a first sequence vector, the first linear information is expressed as a second sequence vector, the second nonlinear information is expressed as a third sequence vector, and the second linear information is expressed as a fourth sequence vector, then a first matrix indicating transformation from the first sequence vector to the second sequence vector is different than a second matrix indicating transformation from the third sequence vector to the fourth sequence vector.