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nbdkit now supports LUKS encryption

Submitted by Roy Schestowitz on Saturday 14th of May 2022 07:06:44 PM Filed under
Linux

The threat model here is that you can store the encrypted data on a remote server, and the admin of the server cannot decrypt the disk (assuming you don’t give them the passphrase).

If you try this filter (or qemu’s device) with a modern Linux LUKS disk you’ll find that it doesn’t work. This is because modern Linux uses LUKSv2, although they are able to create, read and write LUKSv1 if you use set them up that way in advance. Unfortunately LUKSv2 is significantly more complicated than LUKSv1. It requires parsing JSON data(!) stored in the header, and supports a wider range of password derivation functions, typically the very slow and memory-intensive argon2. LUKSv1 by contrast only requires support for PBKDF2 and is generally far more straightforward to implement.

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