Abstract:

In the pseudonyms based reputation system, there exist conflicts between anonymity and reputation. The reputation evaluation between pseudonyms sometimes appears out of control. A preserving reputation system based conditional anonymity is proposed,with which, the reputation evaluation between pseudonyms is monitored. Only the users who meet the conditional anonymity can obtain the trust value. Violators can be detected and punished. Furthermore, the model makes the real identity blinding reputation account, and based on blind signature, the reputation is updated and the conflict between anonymity and reputation is solved. Analysis shows the scheme guarantees user anonymously gains trust value, updates and demonstrates reputation, makes the reputation in control and limits the ballot-stuffing and Sybil attacks.

Key words: privacy, conditional anonymity, reputation system