Half-Broadcast Encryption for Anonymity
Broadcast Encryption (BE) have been widely used to pay TV, distributed systems and others. In general concept of this encryption, most BE schemes have to broadcast all packets to all network because of intermediate nodes cannot know accurate nodes needing broadcasted packets due to encryption. In this paper, the authors propose Half-Broadcast Encryption (HBE). Recently, a number of distributed systems have been designed as hierarchical model composed of several levels. In the model, HBE communicates as top-down with reducing log gbn traffic than general broadcast encryption. In the proposed scheme, intermediate nodes decide whether they broadcast received packets with protecting anonymity of destinations.