This disk contains programs and documentation for ENCRYPT, DECRYPT, and
HEXDUMP.

ENCRYPT Version  1.0
--------------------

This program copies a file and encrypts as it does so.
The program will encrypt any file by means of a user supplied password, and
the file can ony be decrypted by means of the same password and the
accompanying program 'DECRYPT'.
The encrypted file is the same length as the original file.

The encryption scheme used is similar to the Data Encryption Standard,
but is more secure, and non_symetrical. (i.e. encrypting an encrypted file
does not result in the original file) , therefore you must have the
accompanying 'DECRYPT' program (and the password) to decrypt your file.
There are at least two advantages of this scheme:-
  1. The encryption scheme is more secure than the DES.
  2. A file may be encrypted more than once, giving an exceptionally
     high degree of security.

Initiating the program:-

Ensure the program is in the current directory or available via the DOS PATH
command and type:-

  ENCRYPT input_file_name output_file_name

where 'ENCRYPT' is the name of the program
      'input_file_name' is the full name of the file to be encrypted
      'output_file_name' is the full name given to the encrypted file

Operation:-

The program prompts for the input and output files names if they are not
given on the command line.
The program always prompts for the password which cannot be given on the
command line.
The password may be up to 255 characters in length and may consist of any
characters including spaces.

WARNING                          WARNING                            WARNING
-------                          -------                            -------

There is no way to decrypt an encrypted file without the password, so you
better not forget it.

DECRYPT Version  1.0
--------------------

This program copies a file and decrypts as it does so.

The program will decrypt any file, which has been encrypted by the
accompanying ENCRYPT program.

Initiating the program:-

Ensure the program is in the current directory or available via the DOS PATH
command and type:-

  DECRYPT input_file_name output_file_name

where 'DECRYPT' is the name of the program
      'input_file_name' is the full name of the encrypted file
      'output_file_name' is the full name given to the unencrypted file

Operation:-

The program prompts for the input and output files names if they are not
given on the command line.
The program always prompts for the password which cannot be given on the
command line.
The password must be exactly the same as the password used to encrypt the
file. Upper case letters are not the same as lower case letters and spaces
are significant.

WARNING                          WARNING                            WARNING
-------                          -------                            -------

There is no way to decrypt an encrypted file without the password, so you
better not have forgotten it.

HEXDUMP Version 1.1
-------------------

This is an upgrade which corrects a minor bug. The bug caused corrupted
addresses when the file length exceeded 64K.

This program provides a hexadecimal dump of a file on the screen. No
stopping occurs at end of page but the output may be piped or
redirected using DOS pipes or redirection commands.

Hexdump outputs to standard I\O so that the output may be directed to a file
or another device (e.g. printer).

   Examples of use:-

Ensure the program is in the current directory or available via the DOS PATH
command and type:-

  HEXDUMP filename        Dumps a file to the screen without page breaks

  HEXDUMP filename |MORE  Dumps a file to the screen with page breaks

  HEXDUMP filename >PRN   Dumps a file to the printer

The program prompts for the file name if it is not given on the command
line.

COPYRIGHT and LICENCE
---------------------

These programs have been placed in the public domain by the author.
Copies may be made for non_commercial, demonstration or evaluation use.
Any copies made for commercial use or use by profit_making users must be
registered and licensed.

License fee varies form program to program, and is given in the program's
sign on message.
All users may register for upgrades for $12.50 (Australian).