Lightweight Identity-Based Broadcast Encryption over Wireless Ad Hoc Networks

Due to wireless ad hoc networks´ properties of low bandwidth, high delay, high loss rate, and mobility, the implementation of broadcast encryption over wireless ad hoc networks has been a tough problem. This paper describes a lightweight identity-based broadcast encryption scheme including traitor tracing function, which achieves constant size ciphertexts, constant size private keys, and constant size public key. When adding new users, system doesn´t have to change previous setups. In addition, by adjusting symmetric key life cycle, system can make tradeoff between security level and efficiency.