DES algorithm decryption process is the same, the only difference is that the first iteration used Subkey K15, K14 ,......, second last with K0, the algorithm itself without any change.
DES法解密过程是一样,区别仅仅在于第一次迭代时用子密钥K15,第二次K14、......,最后一次用K0,法身并没有任何变化。