NAME

       bcrypt - blowfish file encryption

SYNOPSIS

       bcrypt [-orc][-sN] file ...

DESCRIPTION

       bcrypt encrypts and decrypts files using the blowfish algorithm.

       Encrypted  files will be saved with an extension of .bfe.  Any files ending in .bfe will be assumed to be
       encrypted with bcrypt and will attempt to decrypt them. Any other input files will be encrypted.  If more
       than one type of file is given, bcrypt will process all files which are the same as  the  first  filetype
       given.

       By  default,  bcrypt  will  compress  input  files  before  encryption, remove input files after they are
       processed (assuming they are processed successfully) and  overwrite  input  files  with  random  data  to
       prevent data recovery.

       Passphrases  may  be  between  8  and 56 characters. Regardless of the passphrase size, the key is hashed
       internally to 448 bits - the largest keysize supported by the blowfish algorithm. However,  it  is  still
       wise to use a strong passphrase.

OPTIONS

       -o     print output to standard out. Implies -r.

       -c     DO NOT compress files before encryption.

       -r     DO NOT remove input files after processing

       -sN    How  many  times to overwrite input files with random data before deleting.  The default number of
              overwrites is 3. Use -s0 to disable this feature. No effect if -r is supplied.

NOTES

       The -o ,-r ,and -c options each have the opposite effects if the appropriate settings  are  altered  from
       the  defaults in config.h. To determine what effect each of these have on your system, run bcrypt without
       any options.

       Encrypted files should be compatible between most systems.  Binary compatibility has been tested  on  all
       supported  systems.  There  is a list of supported systems in the README file that was included with this
       software.

BUGS

       Probably.  If you find that it will not compile and run on your system, or that encrypted files  are  not
       compatible  with  other  platforms, its probably because I don't have access to the platform in question.
       Patches or access to an unsupported machine are welcome.

AUTHOR

       johnny shelley
              <jshelley@cahaus.com>, <jshelley@ictransnet.com>

DISTRIBUTION

       bcrypt includes Paul Kocher's implementation of the blowfish  algorithm.  The  version  distributed  with
       bcrypt has been altered. Original sources are available from http://www.counterpane.com/bfsh-koc.zip

version 1.1                                     10 September 2002                                      bcrypt(1)