Patent ID: 9117089
Filing Date: 2015-08-25
Classification: G06F,H04L

Abstract:
1. A method of controlling access in a social network service, the method performed at an access control apparatus, the method comprising: (a) generating a core key and a plurality of sub keys by segmenting a master key unique to a file owner, the plurality of sub keys assigned differently to a plurality of groups divided according to trust level and relationship type; (b) determining a group to which a file requester belongs by using at least one of a friend list of the file requester, a trust level between the file requester and the file owner, and a friend list of the file owner, and distributing a sub key corresponding to the determined group to the file requester, when the file requester requests a key distribution; and (c) determining whether or not access to a file of the file owner is authorized by using the sub key distributed to the file requester and the core key, when the file requester requests the file, wherein step (c) comprises: receiving a file request message from a file requester terminal, the file request message including at least one of a file requester ID, a file owner ID, and a sub key distributed beforehand according to the trust level and the relationship type with respect to the file owner.