University of Bedfordshire
E-commerce means buying and selling goods and services across the internet. Secured communication in e-commerce, across unsecured medium, such as the internet, represents one of the major components in a domain of providing necessary security-critical demands, so the flow of information could go in a secure way. The internet, as a global computer network must provide five major security services: confidentiality, data integrity, authentication, availability, and non-repudiation of information. Without guaranteeing as for mentioned security goals, risks may be very high in e-commerce systems.