[Zenst]

I don't believe it. If you have a text of say "WIBBLE" and thats encrypted and thats all you have, then you can run thru every permutation(brute force) and compare until your decrypted text matchs the known text. No shortcuts to this, but still brute/rainbow realms.

[aw4y]

brute works (but slowly?)...rainbow should be created on cleartext basis...change the cleartext and trash the rainbow!