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I know. Tails itself is a very secure operating system, but what about its drive encryption? I would like to encrypt my flash drive with the tails built in drive encryption. What does it use? AES-256?

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As explained in the documentation, Tails uses dm-crypt through its LUKS front-end. This is the standard for disk encryption under Linux.

LUKS offers a choice of ciphers; the defaults are good (AES-256, CBC or XTS depending on the version, PBKDF2 for password hashing).

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