This topic discusses several electronic payment methods.

Electronic payment method of credit card:

(1) Direct transfer mode: the number information of the credit card is directly encrypted and then directly transferred to the merchant.

(2) Professional account method: that is, the payment is made through a third-party agent, and the customer holds the account of the third-party agent online or offline.

(3) Special protocol mode: simple credit card encryption, special encryption protocol (such as SHTTP, SSL, etc. ) between customers, merchants and bank card institutions.

(4)SET protocol: an online payment protocol for bank cards. Security measures include symmetric key identity, public key identity, message digest, digital signature, digital envelope, double signature and authentication.

Comprehensive analysis, this question chooses a.