14 - Lecture #14 SS G513 Network Security Secure Electronic...

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Lecture #14 SS G513 Network Security
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Secure Electronic Transactions (SET) to protect Internet credit card transactions developed in 1996 by Mastercard, Visa etc not a payment system secure communications amongst parties trust from use of X.509v3 certificates privacy by restricted info to those who need it
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SET Components
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SET Transaction 1. customer opens account 2. customer receives a certificate 3. merchants have their own certificates 4. customer places an order 5. merchant is verified 6. order and payment are sent 7. merchant requests payment authorization 8. merchant confirms order 9. merchant provides goods or service 10.merchant requests payment
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Dual Signature customer creates dual messages order information (OI) for merchant payment information (PI) for bank neither party needs details of other but must know they are linked use a dual signature for this signed concatenated hashes of OI & PI
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Purchase Request – Customer
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Purchase Request – Merchant
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Purchase Request – Merchant 1. verifies cardholder certificates using CA sigs 2. verifies dual signature using customer's public signature key to ensure order has not been tampered with in transit & that it was signed using cardholder's private signature key 3. processes order and forwards the payment information to the payment gateway for authorization (described later) 4. sends a purchase response to cardholder
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Payment Gateway Authorization 1. verifies all certificates 2. decrypts digital envelope of authorization block to obtain 3. verifies merchant's signature on authorization block 4. decrypts digital envelope of payment block to obtain 5. verifies dual signature on payment block 6. verifies that transaction ID received from merchant matches that in PI received (indirectly) from customer 8. sends authorization response back to merchant
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Payment Capture merchant sends payment gateway a payment capture request gateway checks request then causes funds to be transferred to merchants account notifies merchant using capture response
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Summary have considered: need for web security SSL/TLS transport layer security protocols SET secure credit card payment protocols
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Cryptography and Network Security Third Edition by William Stallings Lecture slides by Lawrie Brown
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They agreed that Graham should set the test for Charles Mabledene. It was neither more nor less than that Dragon should get Stern's code. If he had the 'in' at Utting which he claimed to have this should be possible, only loyalty to Moscow Centre would prevent it. If he got the key to the code he would prove his loyalty to London Central beyond a doubt. Talking to Strange Men,
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14 - Lecture #14 SS G513 Network Security Secure Electronic...

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