Patent ID: 8515064
Filing Date: 2013-08-20
Classification: H04L,H04N

Abstract:
1. A method of key management in a communication network that comprises a plurality of service groups, where each group includes at least one member authorized to have access to key-protected services of the group, the method comprising: determining when a member of a service group starts switching from a key-protected service of the service group to at least one other key-protected service of another service group; determining a time dependent quantity starting from the time said member started said switching; determining that the member is a member of a service switching group when said time dependent quantity is less than a predetermined threshold value; determining that the member has decided to join a new service group when the time dependent quantity is greater than said predetermined threshold value; and changing the access key of the key-protected services of the new service group which the member has been determined to join.