> Worst case, you'd have to let it run overnight. AFAIK the best current preimage attack against MD5 gives you a complexity of 2^123.4. Even if you had every c

> Worst case, you'd have to let it run overnight. AFAIK the best current preimage attack against MD5 gives you a complexity of 2^123.4. Even if you had every computer in the world working on this you'd never succeed. >One of the big issues is collisions. You might not find the original key, but you'd find something that hashed to the equivalent output. This is false. There does not exist a feasible preimage attack against MD5.