crypt man page on Ultrix

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crypt(1)							      crypt(1)

Name
       crypt - encode/decode (available only if the Encryption layered product
       is installed)

Syntax
       crypt key < input.File > output.File

Description
       This reference page describes software that is available	 only  if  the
       Encryption layered product is installed.

       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 fundamen‐
       tal  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 poten‐
       tially visible to users executing ps(1) or a derivative.	  To  minimize
       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

See Also
       ed(1), ex(1), vi(1), xsend(1), crypt(3), makekey(8)

								      crypt(1)
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