this post was submitted on 23 Jun 2023
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PSA: Upgrade your LUKS PBKDF to Argon2id! (tails.boum.org)
submitted 1 year ago by maltfield@lemmy.ca to c/linux@sopuli.xyz
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TIL the French government may have broken encryption on a LUKS-encrypted laptop with a "greater than 20 character" password in April 2023.

When upgrading TAILS today, I saw their announcement changing LUKS from PBKDF2 to Argon2id.

The release announcement above has some interesting back-of-the-envelope calculations for the wall-time required to crack a master key from a LUKS keyslot with PBKDF2 vs Argon2id.

And they also link to Matthew Garrett's article, which describes how to manually upgrade your (non-TAILS) LUKS header to Argon2id.

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[–] maltfield@lemmy.ca 3 points 1 year ago

See also https://anarchistburecross.noblogs.org/post/2023/04/27/chiffrement-du-disque-dur-linux-mettez-a-niveau-votre-fonction-de-derivation-de-cle-luks/

[–] garp@sopuli.xyz 2 points 1 year ago

Thanks for the links and advice. They were good to read.

[–] grey@discuss.tchncs.de -1 points 1 year ago (1 children)

I don’t use LUKS because I found it to be too much trouble, but if they broke the crypto on LUKS doesn’t that mean a lot of shit out there is vulnerable and not just LUKS encrypted hard drives?

[–] maltfield@lemmy.ca 3 points 1 year ago

LUKS is not broken. An old KDF option in LUKS for encrypting the master encryption key in a keyslot is just old and less safe than newer, better KDF options.