crypt man page on HP-UX

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crypt(1)							      crypt(1)

       crypt - encode and decode files


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

       The latter command decrypts the file and prints the clear version.

       Files encrypted by are compatible with those treated by the  editor  in
       encryption mode (see ed(1)).

       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 clear text can become visi‐
       ble must be minimized.

       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 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,  for	 example, three lowercase 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 command, it is potentially visible
       to users executing the or a derivative (see ps(1)).  The choice of keys
       and key security are the most vulnerable aspect of

       The  following  example demonstrates the use of to edit a file that the
       user wants to keep strictly confidential:


       Note that the option is the encryption mode of and prompts the user for
       the same key with which the file was encrypted.

       If  output  is  piped to and the encryption key is given on the command
       line, can leave terminal modes in a strange  state  (see	 nroff(1)  and

       If  two	or more files encrypted with the same key are concatenated and
       an attempt is made to decrypt the result, only the  the	first  of  the
       original files is decrypted correctly.

       for typed key

       ed(1), makekey(1), stty(1).


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