The Crypto Applet is used to generate a secret session key parameter to e-Business applet. Do this once when you setup e-Business Applet and you want to recieve payments by credit card. Second Crypto Applet is used to decrypt the credit card numbers you in the orders you recieve from e-Business Applet. Simply cut and paste the encrypted credit card numbers into the Crypto Applet and use the same password you used to generate the secret session key parameter.