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IDEA(1)								       IDEA(1)

NAME
       idea - encrypt/decrypt a file with the IDEA cipher

SYNOPSIS
       idea [ -e ] [ -d ] key [ datafile ]

DESCRIPTION
       Idea  encrypts  or  decrypts  data  using  the IDEA (International Data
       Encryption Algorithm) cipher first proposed by  Xuejia  Lai  and	 James
       Massey in 1990.

       The  -e	option	encrypts the data and the -d option decrypts the data.
       Exactly one of these must be specified on the command line.

       The key is any 16 character string which is used as the	key  for  both
       encryption and decryption.

       The  data  to  be  encrypted/decrypted is either in datafile or is read
       from standard input. If no input file is given, the output from idea is
       always  sent  to	 standard  output. For encryption, if an input file is
       specified the output is sent to a file with the name datafile.id.   For
       decryption,  if	an input file is specified it should have a .id exten‐
       sion and the output is sent to a file whose name is  that  of  datafile
       without the .id extension.

EXAMPLES
       Encrypt the data in the file A10076795.gz:

	      idea -e 'abcd2345 $+*LMNO' A10076795.gz

       The  encrypted  data is put in the file A10076795.gz.id. Once this file
       is transmitted, the receiver can then decrypt it, as long as he has the
       key, with:

	      idea -d 'abcd2345 $+*LMNO' A10076795.gz.id

       The decryped data is put in the file A10076795.gz.

       Note  that  the	quotes around the key are interpreted by the shell and
       simply delimit the key string.

SOURCE
       /appl/cmd/idea.b
       /utils/idea/idea.c

								       IDEA(1)

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