E-commerce is about using a digital means of transmission to conduct business across a network. Products and services are delivered based on the customer-client agreement where a digital compensation, paid by the client, can be exchanged for a widely used monetary value. In an electronic payment system, banks exchange electronic cash units with customers for an equivalent value. Customers store these e-cash units in their electronic wallet.
Electronic checks work in a very similar way.
Certification Authorities are agents that associate public keys to identities. This form of certification is often referred to as a public key certificate, whereas an Attribute Certificate is one that binds characteristics to an identity. Dangers to e-commerce include forgery and infringement of privacy. Preferences, tastes, personal habits, and spending patterns are examples of what marketing agencies use to direct their advertising. Everything from news postings to credit cards purchases, personal and financial interests, e-mail and political opinions can be archived and sold.