Archive for the 'Crypto' Category

F-Secure Khallenge Level 1

Published on August 15, 2008 in Conferences, Crypto, Reverse Engineering and Windows. 2 Comments

Thanks to Aleksey and Phn1x for dealing with my constant stream of questions while reversing this. You’d think it was the first time I opened a debugger!

The level 1 challenge was a binary that asked for input and, if your input was correct, printed out an e-mail address you could use to get the level 2 binary. The Khallenge is a contest of speed, so the first person to get to and beat level 3 wins. Unfortunately, I solved level 1 after the contest ended and the level 2 and 3 binaries aren’t online yet, so no prizes and no info on those.

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Countermeasures to Cold Booting Attacks

Published on February 23, 2008 in Crypto, Forensics and Physical Security. 5 Comments

There’s been a bit of a back and forth discussion on one of our mailing lists regarding Ed Felten’s recent cold-booting attacks on software FDE (BitLocker, FileVault, dm-crypt etc.). I thought it might be worthwhile to collect some of the potential software-only modifications that would protect against his attacks.

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