Show that DES decryption is, in fact, the inverse of DES encryption.
首先DES的流程:IPFirst,the64-bitplaintextpassesthroughaninitialpermutation.16Roundsofthesamefunction32-bitswapIP^(-1)Inverseinitialpermutation而Withtheexceptionoftheinitialandfinalpermutations,DEShastheexact