xenial (1) bcrypt.1.gz

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