Access control for Web Services Based on feedback and decay

Security is a very important requirement for any Web application. In order to avoid free-rider behaviors and reduce requesters´ malicious accesses in Web services, a kind of trust management based on feedback and time decay in Web Services is presented in this paper. According to the service providers´ feedback, honest accesses will be rewarded while dishonest ones will get punishment by such mechanism, which would effectively encourage the service requesters to take part in access control honestly and avoid free-rider behaviors by giving those who are dishonest and inactive a kind of time decay punishment. After simulated experiments, the effectiveness of the trust mechanism is verified, which indicates that this kind of trust management is able to encourage the service requesters to take part in access control much more actively with an honest attitude so that the security of Web services gets improved.