Changes

Note that the attack attemps to recover the [[wikipedia:File:DES-key-schedule.png|first round subkeykey]], which only has 48bits([[wikipedia:File:DES-f-function.png|8 s-box x 6 bits each]]), while the original key has 56 significant bits (64 if we count the parity bits that are irrelevant). So, if we map the first round subkeykey, obtained after the attack, to the original key (you can use the provided DES Key Schedule Tool to do it), there will still be 8 bits missing (256 combinations).