Dynamic identity‐based broadcast proxy re‐encryption for data sharing in autonomous vehicles

Summary Autonomous vehicles (AVs), as the essential part of intelligent autonomous transportation system, improves vehicle communication efficiency and supports diverse kinds of social services. However, with the development of AVs, more data has been generated by the sensors about the road, traffic, street light, and weather conditions. This also inevitably bringing new security problems, such as secure data sharing. Although the identity‐based broadcast proxy re‐encryption (IBBPRE) can be used to realize one‐to‐many data sharing, most existing schemes require access to the data owner for the group shared key update phases since the data owner's private key is mandatory for the group shared key generation. Therefore, frequent interaction with the data owner increases the operational burden and risks leaking the data owner's private key. Thus, we design a dynamic identity‐based broadcast proxy re‐encryption (DIB‐BPRE) to solve the problem of re‐encryption update. In the proposed scheme, a vehicle cloud server directly revokes or adds a group of data receivers, designated by the data owner, from the re‐encryption key. Finally, the theoretical and experimental analyses demonstrate that the DIB‐BPRE scheme is efficient, and it is suitable for data sharing in AVs.