A technique for dynamically creating and deleting groups to support secure group communication sessions is provided herein. A request for creation of a dynamic group that enables group members to participate in a secure group communication session is received by a network authentication device such as a key server. Creation of the dynamic group includes generating a lifetime attribute indicating when the dynamic group is to exist based on timing information provided in the request, along with security policies required for generating the keys, and generating a unique group ID associated with the dynamic group for distribution to the group members. The keys for the secure group communication session are supplied, along with security policies, in response to a request containing the unique group ID identifying the dynamic group. The dynamic group is deleted in response to determining from the lifetime attribute that the secure group communication session has expired.