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)						      General Commands Manual							  crypt(1)

NAME

       crypt - encode/decode

SYNOPSIS

       crypt key < input.File > output.File

DESCRIPTION

       The  command reads from the standard input and writes on the standard output.  You must supply a key which selects a particular transforma-
       tion.  If no password is given, demands a key from the terminal and turns off printing while the  key  is  being  typed	in.   The  command
       encrypts and decrypts with the same key.

       Files encrypted by are compatible with those treated by the ed, ex and vi editors 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, and sneak paths by which keys or clear text can become visible must be minimized.

       The command 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 known, but not widely; moreover the amount of work required is likely to be large.

       The transformation of a key into the internal settings of the machine is deliberately designed to be expensive, for example, to take a sub-
       stantial fraction of a second to compute.  However, if keys are restricted to three lowercase letters, then encrypted files can be read	by
       expending only a substantial fraction of five minutes of machine time.

       Since the key you choose is an argument to the command, it is potentially visible to users executing the command or a derivative.  To mini-
       mize this possibility, destroys any record of the key immediately upon entry.  The most vulnerable aspect of is the choice of keys and  key
       security.

EXAMPLES

       The following examples use KEY as the key to encrypt and decrypt files.	The first example encrypts the file naming the resulting encrypted
       file The second example decrypts the file naming the resulting decrypted file The third example prints the encrypted file in clear text.  $
       crypt KEY < plain.File > crypt.File $ crypt KEY < crypt.File > decrypt.File $ crypt KEY < crypt.File | pr

FILES

       for typed   key

RELATED INFORMATION

       ed(1), ex(1), vi(1), crypt(3), makekey(8) delim off

																	  crypt(1)

Linux and UNIX Man Pages

enigma(1) [freebsd man page]

Check Out this Related Man Page