The full name of the SET protocol is Secure Electronic Transaction.

The SET protocol is an e-commerce security protocol based on credit card online payment. It was jointly launched by VISA and MasterCard in May 1997. This protocol is mainly used in the B to C model to ensure the security of payment information. The SET protocol ensures the security of data transmission and storage during the payment process by using digital certificates, encryption technology, and digital signatures. It provides a secure payment environment so that consumers can shop and pay online with confidence.