Abstract:

In order to reveal the dependence of the recommendation mechanism upon the recommendation link in trust and reputation models and to overcome the difficulty in the punishment of vicious recommendation entities, this paper proposes a recommendation mechanism based on the Web of trust by using the subjective logic, presents the basic definition of the Web of trust, gives the formal descriptions of the dependence among recommendation links,and provides the corresponding solutions. Moreover, the trust intensity is utilized to overcome the difficulty of subjective logic in the punishment of vicious recommendation entities. Thus, the precision of recommendation information is improved. Simulated results show that the recommendation mechanism based on the Web of trust can decrease the number of accessing vicious entities to some extent and effectively punish any possible vicious recommendation entities.

Key words: trust model, reputation model, Web of trust, recommendation mechanism, subjective logic, vicious recommendation