| 摘要 |
In an electronic transaction system, a buyer (B) initiates a purchase from a seller (S), which sends an offer to sell (OS) to the buyer (B) over the Internet. The buyer (B) sends payment details (PD) over the Internet to a buyer authenticator (BA), which authenticates the identity of the buyer (B) and sends a buyer authentication message (BAM), over a secure network to a seller authenticator. From the contents of the buyer authentication message (BAM), the seller authenticator (SA) identifies the seller (S) and sends the offer to sell message (OS) to the seller (S). The seller (S) checks whether the offer to sell message matches that originally sent to the buyer, and if so sends an offer to sell confirmation (OSC) to the seller authenticator (SA), where the message is forwarded to the buyer authenticator (BA) and thence to the Buyer (B). Fulfilment (F) of the order is initiated and the seller sends a transaction confirmation to the seller authenticator (SA). The system uses the authenticators as intermediaries to establish a virtual trust domain between buyer and seller. Security is increased by requiring that both buyer and seller confirm the existence of the transaction to other parties. A modification is also disclosed in which the buyer authenticator calculates any tax due on the delivery of the order, and obtains the buyer's agreement to pay this tax before the transaction can proceed.
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