Patent ID: 8423764
Filing Date: 2013-04-16
Classification: H04L

Abstract:
1. A method for attribute revocation in an attribute-based encryption system, the method comprising the steps of: receiving, at an attribute authority, a revocation request for a particular attribute of a plurality of attributes shared among a plurality of system users; updating, by the attribute authority, an attribute string used for key creation in an attribute-based encryption for the particular attribute, wherein attribute strings associated with other attributes of the plurality of attributes are not updated, wherein the attribute strings associated with the plurality of attributes are used to generate a key, and wherein updating the attribute string permits a user associated with all of the plurality of attributes to decrypt data that is encrypted using the key but not a user that is associated with one or more of the plurality of attributes but that is not associated with the particular attribute; and providing, by the attribute authority, the updated attribute string to an authorized system participant using the attribute-based encryption system.