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ENIGMA(1)		FreeBSD	General	Commands Manual		     ENIGMA(1)

     enigma, crypt -- very simple file encryption

     enigma [-s] [-k] [password]
     crypt [-s]	[-k] [password]

     The enigma	utility, also known as crypt is	a very simple encryption pro-
     gram, working on a	``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.  Since its operation is fully symmetrical,
     feeding the encrypted data	stream again through the engine	(using the
     same secret key) will decrypt it.

     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	getpass(3).  This is the only safe way of providing it.

     Alternatively, the	key can	be provided as the sole	command-line argument
     password when starting the	program.  Obviously, this way the key can eas-
     ily be spotted by other users running ps(1).  As yet another alternative,
     enigma can	be given the option -k,	and it will take the key from the
     environment variable CrYpTkEy.  While this	at a first glance seems	to be
     more secure than the previous option, it actually is not since environ-
     ment variables can	also be	examined with ps(1).  Thus this	option is
     mainly provided for compatibility with other implementations of enigma.

     When specifying the option	-s, enigma modifies the	encryption engine in a
     way that is supposed to make it a little more secure, but incompatible
     with other	implementations.

     The cryptographic value of	enigma is rather small.	 This program is only
     provided here for compatibility with other	operating systems that also
     provide an	implementation (usually	called crypt(1)	there).	 For real
     encryption, refer to bdes(1), openssl(1), pgp(1) (ports/security/pgp), or
     gpg(1) (ports/security/gnupg).  However, 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.

	   CrYpTkEy  used to obtain the	secret key when	option -k has been

	   man enigma |	enigma > encrypted
	   Enter key: (XXX -- key not echoed)

     This will create an encrypted form	of this	man page, and store it in the
     file encrypted.

	   enigma XXX <	encrypted

     This displays the previously created file on the terminal.

     bdes(1), gpg(1), openssl(1), pgp(1), ps(1), getpass(3)

     Implementations of	crypt are very common among UNIX operating systems.
     This implementation has been taken	from the Cryptbreakers Workbench which
     is	in the public domain.

FreeBSD	11.0			 May 14, 2004			  FreeBSD 11.0


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