Am currently working on an internal host to host payment system using triple encription. Am using a combination of static data such as account number or card number which will be triple ecriypted using special card verification key pair. Selected digits from the result will be used to creat the CVV and will be written onto the magnetic stripe. My problem is how to generate the CVV using the assigned card number and expiry date. should I assign any numbers or is there any formula or algorithim to do this. If I have to assign any number when the users are many how will I handle this? who know how I can automaticaly genarate the CVV hence it will provide an added level of confidence that the card will not be easly cdublicated. Also I will further generate CVV2 to be used for telephone authorisation. Any HELP!!!!!


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