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-.\"
-.\" enigma (aka. crypt) man page written by Joerg Wunsch.
-.\"
-.\" Since enigma itself is distributed in the Public Domain, this file
-.\" is also.
-.\"
-.\" $Id$
-.\" "
-.Dd October 30, 1998
-.Os
-.Dt enigma 1
-.Sh NAME
-.Nm enigma
-.Nd very simple file encryption
-.Sh SYNOPSIS
-.Nm
-.Op Fl s
-.Op Fl k
-.Op Ar password
-.Nm crypt
-.Op Fl s
-.Op Fl k
-.Op Ar password
-.Sh DESCRIPTION
-.Nm Enigma ,
-also known as
-.Nm crypt
-is a
-.Em very
-simple encryption program, working on a
-.Dq secret-key
-basis.  It operates as a filter, i. e. it encrypts or decrypts a
-stream of data from standard input, and writes the result to standard
-output.  It automatically detects whether the input data stream is
-already encrypted, and switches into decryption mode in this case.
-.Pp
-There are several ways to provide the secret key to the program.  By
-default, the program prompts the user on the controlling terminal for
-the key, using
-.Xr getpass 3 .
-This is the only safe way of providing it.
-.Pp
-Alternatively, the key can be provided as the sole command-line
-argument
-.Ar password
-when starting the program.  Obviously, this way the key can easily be
-spotted by other users running
-.Xr ps 1 .
-As yet another alternative,
-.Nm
-can be given the option
-.Fl k ,
-and it will take the key from the environment variable
-.Ev CrYpTkEy .
-While this at a first glance seems to be more secure than the previous
-option, it actually isn't since environment variables can also be
-examined with
-.Xr ps 1 .
-Thus this option is mainly provided for compatibility with other
-implementations of
-.Nm enigma .
-.Pp
-When specifying the option
-.Fl s ,
-.Nm
-modifies the encryption engine in a way that is supposed to make it a
-little more secure, but incompatible with other implementations.
-.Pp
-.Ss Warning
-The cryptographic value of
-.Nm
-is rather small.  This program is only provided here for compatibility
-with other operating systems that also provide an implementation.  For
-real encryption, refer to
-.Xr bdes 1
-(from the DES distribution package), or
-.Xr pgp 1
-(from the ports collection).  Hoewever, restrictions for exporting,
-importing or using such tools might exist in some countries, so those
-stronger programs are not being shipped as part of the operating
-system by default.
-.Sh ENVIRONMENT
-.Bl -tag -offset indent -width "XXCrYpTkEy"
-.It Ev CrYpTkEy
-used to obtain the secret key when option
-.Fl k
-has been given
-.El
-.Sh EXAMPLES
-.Bd -literal -offset indent
-man enigma | enigma > encrypted
-Enter key: (XXX \(em key not echoed)
-.Ed
-.Pp
-This will create an encrypted form of this man page, and store it in
-the file
-.Ql encrypted .
-.Bd -literal -offset indent
-enigma XXX < encrypted
-.Ed
-.Pp
-This displays the previously created file on the terminal.
-.Sh SEE ALSO
-.Xr bdes 1 ,
-.Xr pgp 1 ,
-.Xr ps 1 ,
-.Xr getpass 3
-.Sh HISTORY
-Implementations of
-.Nm crypt
-are very common among
-.Ux
-operating systems.  This implementation has been taken from the
-.Em Cryptbreakers Workbench
-which is in the public domain.