Private data access authority management method and device based on fuzzy credibility

The invention discloses a privacy data access authority management method and device based on fuzzy credibility. The method comprises the following steps: firstly, grouping all fuzzy roles according to different authorities for accessing privacy data; and then the fuzzy credibility is evaluated according to the operation behavior and result of the user in the distributed system. And finally, setting time limits for the permissions distributed by the distributed users, wherein the time limits comprise an online time range, an online time length and an accumulated time length. According to the method, the users with the same working property and level are classified into the same fuzzy role group, the authority management of a huge user group can be effectively managed, the authority distribution is flexible, the user authority can be quickly changed, and the system overhead is reduced. The fuzzy credibility is calculated based on the user behavior, the privacy of the user behavior is protected, and the calcula