Recipient Revocable Broadcast Encryption with Dealership

摘要

The broadcast encryption with dealership (BED) scheme allows a dealer, instead of a broadcaster, to manage a recipient. Unlike prior broadcast encryption schemes, BED reduces the burden placed on the broadcaster to manage recipient, which makes it suitable for a broadcasting service targeting a large number of recipients. Subscribing and unsubscribing from the broadcast service occur frequently at the request of the user, however, early versions of BED schemes do not support recipient revocation. In this paper, we propose a recipient revocable broadcast encryption with dealership and show that it is secure in the adaptive security model without random oracles.