PKIs for Mobile Commerce

Public -key cryptography is a key technology for e-commerce, Intranets, extranets and other webenabled applications that require security and authentication in an open network. However, to earn the benefits of public-key cryptography, a supporting public -key infrastructure is needed to publish and manage public-keys. Without a functioning infrastructure, public-key cryptography is just the one of optional algorithms for encryption as the traditional secret-key cryptography, nothing more. This seminar paper describes the fundamental characteristics and operations of public-key security systems, which are common to all PKI system, and also including what benefits they offer and what components are required to implement them. According to those characteristics, especially trust model and certificate revocation, the paper later also describes how the different PKI systems deal with those issues, as a sequence, those criteria will reveal the strengths and weaknesses of each system, and then indicate What is the new trend.