This course is designed to enable students to understand the threats and needs which e-commerce activities are facing, and be familiar with the principles and applications of the common e-commerce encryption technology, authentication technology etc. to master the theory, method and process of online payment, meanwhile to know the common protocols related to online payment. Through the combination of practice and theoretical study, this course will let students understand and master the basic theory and related technology of e-commerce security and payment, and cultivate their practical operation and application ability.