Introduction
------------

Welcome to Crypto!

Crypto is a encryption utility which may wipe out source
files, launch decrypted files and automatically re-encrypt
them after modification.

After I've read 'Murgan's Musings' in Palmtop's issue 18
I've wondered how difficult it is to write an encryption
utility for the EPOC platform. - I know that such a
program already exists, but I was more interested in the
making than in the result.

I'm using Crypto myself for managing a simple database
with tons of logins, passwords and other figures I'm
supposed to know by heart. A perfect job for my little
brain extension - my beloved Series 5.


Release Information
-------------------

V1.02 Production - October, 8 1998

What's new?

- Files with an EPOC Database UID which stored data in
  another format caused an "End of file" error during the
  compacting process. This bug has been fixed


Compatibility to prior releases

- This release is fully compatible to prior releases

- The Crypto file structure has not been changed

- Files encrypted with Crypto V1.02 may be decrypted with
  prior releases too


Features:

- File encryption and decryption using three modes

    - Password only (~ 46'500 bytes per second)
        Stores the unmodified original file. Very fast with
        little protection.

    - Fast encryption (~ 13'100 bytes per second)
        32-bit encryption algorithm. It's fast and secure
        enough for most of us.

    - Secure encryption (~ 960 bytes per second)
        256-bit RC4 encryption algorithm. Unfortunately it's
        slow but useful for small files and top secret
        data.

- Wipe out source files to make sure an undelete is useless

- Cancel and resume during encryption, decryption and wipe 
  file

- Launch support for all file types (for files without a
  EPOC header - like zip archives, plain text files or
  graphics - any installed program may be selected at
  encryption time to open the file)

- Compacting data and agenda files before encrypting

- Automatic re-encryption

- Detects the need of compacting and re-encryption

- General preferences for encryption mode, source file
  treatment after encryption and statistics.

- Available in English, French, Italian and German

- Runs on every EPOC machine


Installation
------------

Crypto is distributed as a Psion’s .sis installation file.

To install Crypto from your 32-bit MS-Windows PC, double
click on the .sis file and follow the instructions.

To install Crypto from your EPOC machine, launch the
.sis file and follow the instructions.

After the installation a new icon should appear in your
extras bar.

Grap a copy of the appropriate installation program from my
web site http://salvis.com/ when your PsiWin release or
your EPOC machine does not support .sis files.


Feedback
--------

Do you have bug reports, enhancement requests or comments?

Your Feedback is very appreciated.

Thank you!

Philipp Salvisberg

e-mail: philipp@salvis.com
www:    http://salvis.com/