Secure Electronic Transaction. (SET). Credit Cards on the Internet. Problem: communicate credit card and purchasing data securely to gain consumer trust Authentication of buyer and merchant Confidential transmissions Systems vary by Type of public-key encryption
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HASH 1 & 2
HASH WITH SHA TO
CREATE NEW DIGEST
ENCRYPT NEW DIGEST
WITH SIGNER’S PRIVATE KEY
DS = EKRC [ H(H(PI) || H(OI)) ]
H(PIMD || H(OI))
H(H(PI) || OIMD)
DKUC [ DS ]
Cardholder registration: cardholder must register with CA before
they can send SET messages to merchants.
Merchant registration: Merchants must register with a CA before
they can exchange SET messages with customers and payment
Purchase request: Message from the customer to the merchant
containing OI for merchant and PI for bank.
Payment authorization: Exchange between merchant and
payment gateway to authorize a given amount for a purchase
on a given credit card account.
Payment capture: Allows the merchant to request payment from
the payment gateway.
Certificate inquiry and status: The cardholder or merchant can
send the Certificate Inquiry message to determine the status of
the certificate request and to receive the certificate if the request
has been approved.
Simple purchase transaction: