Unix Crypt

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Crypt(1) is a very old unix tool used for simple encryption of files.

It should not be used anymore; the algorithm is very weak.

In case you want to decrypt a file that still uses the crypt algorithm, install mcrypt:

% mcrypt -a enigma --keymode scrypt --bare --no-openpgp < encrypted_file.crypt > decrypted_file

Since the crypt algorithm is symmetric, encryption work exactly the same.