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An updated view on centralized secure group communications

The secure multicast field has been extensively studied for more than a decade now and there exist numerous proposals throughout academic literature. However, new scenarios such as ad hoc networks and new consuming models, such as hierarchical access, have arisen since its beginnings. That circumstance has led to the publication of many new proposals in the last years in an effort to suit the emergent environments. This article presents a selection of those most important and popular to the date, focusing on centralized schemes due to their high popularity and the recent appearance of alternatives that do not appear in previous revisions. Comparisons are provided and special attention is paid to communications and storage overhead as well as security.