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ENIGMA(1)		     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 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, feed-
     ing the encrypted data stream again through the engine (using the same  se-
     cret key) will decrypt it.

     There  are  several  ways to provide the secret key to the program.  By de-
     fault, 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 envi-
     ronment variable CrYpTkEy.  While this at a first glance seems to	be  more
     secure than the previous option, it actually is not since environment vari-
     ables 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.

   Warning
     The cryptographic value of enigma is rather small.  This  program	is  only
     provided here for compatibility with other operating systems that also pro-
     vide  an  implementation (usually called crypt(1) there).	For real encryp-
     tion, refer to openssl(1), or gpg(1)(ports/security/gnupg1).

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
     gpg(1)(ports/security/gnupg1), openssl(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.

FreeBSD 15.1			   May 8, 2018			       ENIGMA(1)
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