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mode) and for the stream cipher(s) and the null cipher.

=item B<-p {E<lt>pswdE<gt>|rand}>, B<--pswd={E<lt>pswdE<gt>|rand}>

Specify the password from which to derive the key used for the encryption or
decryption.  (This is known as "password-based encryption" (PBE).)  The special
value "rand" means that a 32-byte password will be randomly generated using the
random number generator specified by the B<--rng> option.

The key will be derived using the PBKDF2 algorithm defined in PKCS#5 v2.0 (which
is also available as RFC2898).  An 8-byte random salt and 2048 iterations are
used.  A random initialization vector (IV) is also generated if required.  When
encrypting, both the salt and IV are prepended to the ciphertext so that they
may be recovered for use when decrypting.

Alternatively, the key may be specified directly (or randomly generated) using
the B<--key> option below.  If both options are given then B<--pswd> is used and
B<--key> is silently ignored.

Note that password-based encryption is preferable to using a fixed key if you
are going to be encrypting many files because the key used in the PBE scheme