Since Martin constantly manages to cover all ongoing news regarding cryptography and security I myself planned on writing about “any time soon”, I had to look for other topics on the subject I could cover. So I decided to make good use of all the time I spend studying this kind of stuff and share this knowledge with you. And I would be very grateful, if someone could tell me in return how to defeat shirred fabrics with my sewing machine… but that’s a whole different matter.

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Just a few days ago I was describing a method that would allow anyone to change passwords for all windows accounts using a boot cd and a program called NT Passwords. This is great if it does not matter if you change the password for, lets say, the administrators account. It might however be sometimes important to get into an account without the owner of the account knowing - and he would surely find out if his password would not be working anymore.

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Ophcrack is a Windows password cracker based on a time-memory trade-off using rainbow tables. This is a new variant of Hellman’s original trade-off, with better performance. It recovers 99.9% of alphanumeric passwords in seconds.

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