Lol, si ctu FAQ k LUKS/dm-crypt a tohle me pobavilo :)
Why is all my data gone if I overwrite the LUKS header?
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The LUKS header contains a 256 bit "salt" value and without that no decryption is possible. While the salt is not secret, it is key-grade material and cannot be reconstructed. This is a cryptographically strong "cannot". From observations on the cryptsetup mailing-list, people typically go though the usual stages of grief (Denial, Anger, Bargaining, Depression, Acceptance) when this happens to them. Observed times vary between 1 day and 2 weeks to complete the cycle. Seeking help on the mailing-list is fine. Even if we usually cannot help with getting back your data, most people found the feedback comforting.
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