SET protocol adopts double signature technology to sign the payment information and order information of consumers in the process of SET transaction, so that merchants can only receive the order information of users and can't see the payment information; However, financial institutions can't see the transaction content, but can only receive the payment information and account information of users, thus fully ensuring the security of consumer accounts and order information.
(2) Ensure the non-repudiation of the trading behavior of merchants and customers.
The key point of SET protocol is to ensure the authentication of merchants and customers and the undeniable transaction behavior. Its theoretical basis is undeniable mechanism, and its core technologies include X.509 electronic certificate standard, digital signature, message digest, double signature and so on.
(3) Ensure the legitimacy of merchants and customers.
SET protocol uses digital certificates to verify the legitimacy of the parties to the transaction. Through the verification of digital certificates, it can ensure that the merchants and customers in the transaction are legal and credible.