Authentication encryption device, authentication decoding device, authentication encryption method, authentication decoding method, authentication encryption program and authentication decoding program

摘要

Authentication encryption device 10Encrypted function to output data of a given number of bits when data of a given number of bits is inputThe encryption means 11 for encrypting the plaintext block by adding a mask value uniquely determined from an adjustment value including a initial vector and a secret key which does not overlap the past value of the plaintext block of the object of the encryption to the past value and a secret key, andThe calculation means 12 is provided with a calculation means 12 for calculating the exclusive or of the corresponding bit in the first bit string of the number of bits less than the predetermined number of bits among the plurality of plaintext blocks constituting the plaintext as a checksum.