Quote:
Originally Posted by DaleDe
... just like you can't retrieve a password.
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You can retrieve a password.
Even if it is stored as a one-way hash.
There are numerous programs (such as well known John The Ripper for unix passwords) and services (such as server in Switzerland that has database of hashes for all possible password combinations for Windows computers (there is maximum 26 letters allowed in Windows))
It can't be that difficult to brute-force CC number on a quad-core machine with more than of 4GB RAM