> This piece is written for software designers, not end-users. If you’re an end-user looking for crypto advice: use Truecrypt, use Filevault, use dm-crypt
It's a great write-up, I read the whole thing. You clearly understand the domain well.
I really just don't get why you'd, in one breath, decry XTS, and then in that same breath, recommend people use TrueCrypt, which is, as you call it, "the best-known implementation of XTS".
Maybe just lead me to the water on this one. It's really the only thing left unresolved in our conversation.
Block-level encryption is a terrible, terrible approach for many reasons (which 'tptacek has referenced a million times). However, Truecrypt is the best such implementation, and it's a required approach in certain cases. You should be doing crypto at the application/filesystem level; if you can't, use Truecrypt. This isn't contradictory advice.
That's not just what he said, he also said, "By encouraging people to rely on tools like Truecrypt, you are, in a very small but real way, endangering them."
> This piece is written for software designers, not end-users. If you’re an end-user looking for crypto advice: use Truecrypt, use Filevault, use dm-crypt