Note the reversal of the subkey order for decryption ; this is the only difference between encryption and decryption : Unbalanced Feistel Cipher Unbalanced Feistel ciphers use a modified structure where and are not of equal lengths .

Decryption requires only reversing the order of the subkey using the same process ; this is the only difference between encryption and decryption : Unbalanced Feistel ciphers use a modified structure where and are not of equal lengths .
