enigma(1) [freebsd man page]

ENIGMA(1)						    BSD General Commands Manual 						 ENIGMA(1)

NAME

     enigma, crypt -- very simple file encryption

SYNOPSIS

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

DESCRIPTION

     The enigma utility, also known as crypt is a very simple encryption program, 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
     easily 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
     environment 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 incompat-
     ible with other implementations.

   Warning
     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.

ENVIRONMENT

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

EXAMPLES

	   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.

SEE ALSO

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

HISTORY

     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.

BSD
								   May 14, 2004 							       BSD

Check Out this Related Man Page

crypt(1)																  crypt(1)

NAME

       crypt - encode or decode a file

SYNOPSIS

       crypt [password]

       The  crypt utility encrypts and decrypts the contents of a file. crypt reads from the standard input and writes on the standard output. The
       password is a key that selects a particular transformation. If no password is given, crypt demands a key from the terminal  and	turns  off
       printing while the key is being typed in. crypt encrypts and decrypts with the same key:

       example% crypt key < clear.file > encrypted.file
       example% crypt key < encrypted.file | pr

       prints the contents of clear.file.

       Files encrypted by crypt are compatible with those treated by the editors ed(1), ex(1), and vi(1) in encryption mode.

       The  security  of  encrypted  files depends on three factors:  the fundamental method must be hard to solve; direct search of the key space
       must be infeasible; "sneak paths" by which keys or cleartext can become visible must be minimized.

       crypt implements a one-rotor machine designed along the lines of the German Enigma, but with a 256-element rotor.   Methods  of	attack	on
       such machines are widely known, thus crypt provides minimal security.

       The transformation of a key into the internal settings of the machine is deliberately designed to be expensive, that is, to take a substan-
       tial fraction of a second to compute.  However, if keys are restricted to (say) three lower-case letters, then encrypted files can be  read
       by expending only a substantial fraction of five minutes of machine time.

       Since  the key is an argument to the crypt command, it is potentially visible to users executing ps(1) or a derivative command. To minimize
       this possibility, crypt takes care to destroy any record of the key immediately upon entry. No doubt the choice of keys	and  key  security
       are the most vulnerable aspect of crypt.

       /dev/tty        for typed key

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

       des(1), ed(1), ex(1), ps(1), vi(1), attributes (5)

								    8 Mar 2005								  crypt(1)

Linux and UNIX Man Pages

enigma(1) [freebsd man page]

Check Out this Related Man Page