Adaptively Secure Broadcast Encryption with Dealership

摘要

In this paper, we put forward first adaptively chosen plaintext attack (CPA) secure broadcast encryption with dealership (BED) scheme in standard model. We achieve adaptive security in the standard model under reasonable assumption in contrast to semi-static security of Gritti et al. and selective security in random oracle model by Acharya et al. Our scheme also achieves privacy in form of hiding the group of subscribed users from broadcaster and supports maximum number of accountability under reasonable assumptions. Unlike the scheme of Gritti et al., our scheme does not need to rely on users' response to detect the dishonest dealer like recently proposed scheme of Acharya et al.