Lightweight Information-Sharing System with Access Control in Disaster Management with Security against Dishonest Users

One of the requirements in times of disaster is to obtain information to confirm the safety of victims and to grasp the damage situation in the disaster area. To satisfy this, a system for building a temporary network using drones has been proposed. However, when a user shares his safety information with other users through the drone network, there is a risk of information leakage if the other user is malicious. Furthermore, it should be considered that disaster victims require communication terminals to be as small as possible and to have a long battery life as a requirement. Therefore, a cost-effective and secure information-sharing system that allows access control is required. We present a system that employs (2, 3)-threshold secret sharing and realizes a lightweight access control process specifically designed for drone networks in the event of communication failures during disasters. Furthermore, it incorporates security measures to protect against dishonest users.