Common key block encryption program common key block encryption device, and common key block encryption method

摘要

It provides a common key block encryption device that provides a secure block cipher. Feistel Hash first means for generating a unit block intermediate statement adds the PB block is divided into the PB block and the PA block plaintext, compressed by the hash function, and a PA block (102), unit blocks unit block encryption means for generating a unit block intermediate ciphertext encrypted intermediate sentence (103), pseudo-random number generating means for generating an intermediate random number based on the unit block intermediate ciphertext and (104), PB block and the intermediate random number The combination of a sum of the generated second based the addition result of the addition means for outputting the addition result by adding the door (105), compressed by the hash function, and a unit block intermediate ciphertext, and a sum and a Feistel Hash second means for outputting the results of (106), the ciphertext output means for outputting a ciphertext output result, and (107).