Patent ID: 6883100
Filing Date: 2005-04-19
Classification: G06F

Abstract:
1. A method of employing a resource server to provide resources to a client, the method comprising: associating each resource with a respective age threshold on the basis of a level of security desired for the resource, in which the age threshold represents the oldest allowable age of a membership certificate that can be associated with a request for the resource, such that the resource can be provided in reply to the request only if the membership certificate has an age that is not older than the oldest allowable age, receiving a request from the client for at least one of the resources, the request being associated with a membership certificate that was issued by a server other than the resource server and that certifies at least one of group membership and group non-membership of the client as of a time, determining an age of the membership certificate relative to that time, for each of the at least one resource that is requested by the client: