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*                                              *
* OnHand Encryption / Decryption utility v1.0b *
*  By Jalal Muhtadi (jalal@cyberdudez.com)     *
*  October, 2000.                              *
*                                              *
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This utility allows secure storing of information on the onHand or ruputer watch.
This package contains two programs:

* rupcrypt.exe is a Windows command-line utility for encrypting/decrypting text files
  based on a password.

* decrypt.exf is an onHand utility for viewing the decrypted files.  It is based on 
  the TinyText program by Aaron Miller.


rupcrypt:
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enables you to encrypt confidential text files for storage on the onHand. Usage:

rupcrypt password filename [/d]

The "password" is used to generate a key for encrypting the "filename". The data in
"filename" will be encrypted and stored in an output file with the extension of .enc
If the /d switch is used, the "filename" is decrypted and the plaintext is stored in
an output file.


How to Install and Use decrypt.exf:
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1. copy decrypt.exf to your onHand.
2. Use a utility like "finied" (http://sygnas.tv/soft/finied/) to edit the filer.ini 
   to associate .enc files with decrypt.exf.
3. put "tinyfont.mmp" into the \system\mmp\ directory.
4. encrypt your confidential files on a PC using rupcrypt as above.
5. copy your encrypted files (*.enc) to the onHand. 
6. to view an encrypted file select it, you'll be asked to enter the password.
Enjoy!


Technical Jargon about the encryption used:
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This utility uses RC5 (described in RFC2040) with key sizes of 128 bit. The password 
entered is used to generate a key. The password is not stored anywhere, therefore 
enhancing the security of the data. The performance of RC5 on the OnHand is pretty 
good.


Notes:
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- Size of encrypted files is limited to 16KB.
- Entering a wrong password for an encrypted file would either generate an error
  message or display garbage.
- this is a beta release! e-mail me for suggestions:
  jalal@cyberdudez.com