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算法的解密过程是样的，区别仅仅在于第代时用子密钥K15，第二K14、......，最后用K0，算法本身并没有任何变化。