A Note On Boneh-Gentry-Waters Broadcast Encryption Scheme and Its Like

The Barth-Boneh-Waters Private Broadcast Encryption Scheme Revisited

The primitive of private broadcast encryption introduced by Barth, Boneh and Waters, is used to encrypt a message to several recipients while hiding the identities of the recipients. In their construction, a recipient has to first decrypt the received ciphertext to extract the verification key for one-time signature. He then uses the verification key to check whether the ciphertext is malformed. The authors did not consider that information delivered over a channel, especially over a broadcast channel, should be authenticated as to its origin. We remark that the conventional public key signatu…

分布式广播加密的自适应选择密文安全性

Adaptive Chosen-Ciphertext Security of Distributed Broadcast Encryption

针对现有分布式广播加密方案仅达自适应CPA安全、公钥验证需线性双线性对运算的问题，本文基于双线性群提出半静态CCA安全方案，经修改通用变换得到首个自适应CCA安全的高效DBE方案。

Private reputation retrieval in public - a privacy-aware announcement scheme for VANETs

An announcement scheme is a system that facilitates vehicles to broadcast road-related information in vehicular ad hoc networks (VANETs) in order to improve road safety and efficiency. Here we propose a new cryptographic primitive for public updating of reputation score based on the Boneh-Boyen-Shacham short group signature scheme. This allows private reputation score retrieval without a secure channel. Using this we devise a privacy-aware announcement scheme using reputation systems which is reliable, auditable and robust.