Filippo Valsorda: reversing OpenBSD FDE passwords

Filippo Valsorda of the CloudFlare Security Team wrote a blog on OpenBSD’s full-disk-encryption, after he lost his password.

So I lost my OpenBSD FDE password
The other day I set up a new OpenBSD instance with a nice RAID array, encrypted with Full Disk Encryption. And promptly proceeded to forget part of the passphrase. […] I did a weak attempt at finding some public bruteforce tool, and found nothing. I say weak because somewhere in the back of my brain, I already wanted to take a peek at the OpenBSD FDE implementation. Very little is documented, and while I do trust OpenBSD, I want to know how my data is encrypted. So this was the “perfect” occasion. […]

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