and one for message encryption). It must be at least 8 characters long and have a maximum of 256 characters. If it contains spaces, it should be enclosed in double quotes (e.g: -k &quot;Use this to encrypt it all&quot;). Special characters should be escaped using a backslash. Passphrases longer than 256 characters are valid but will be truncated. Cryptographic keys are derived from this passphrase using the PBKDF2 algorithm. If no passphrase is supplied, it will be asked interactively.
</DL>

<P>

<B>-c</B>