DSBS: A Novel Dependable Secure Broadcast Stream over Lossy Channels

Confidential authenticated broadcast/multi cast over lossy channels is an important and challenging problem. Applications include the continuous confidential authentication of radio and TV internet broadcast/multicast data distribution by satellite and critical data broadcast in critical tasks (e.g. sensor network for military tasks). Main challenges are authenticity, confidentiality, loss-tolerance, efficiency. Asymmetric cryptography approaches have high security but are expensive in computation and communication. In this paper we propose and prototype a novel loss-tolerance mechanism for lossy channels ensuring authenticity, confidentiality, DoS resistance, efficiency and simplicity. Most applications in practice do not need ideal and perfect real-time task and a minor delay around some seconds is completely acceptable, except a few applications such as safety beacons in VANET. In many applications, such as updating code memory of MANET, delay around some minutes is acceptable, too. Hence, our aim is to provide a robust and dependable loss-tolerant secure broadcast stream at cost of delayed-verification. As an experimental implementation we prototype our proposal in a wireless sensor networks to show its efficiency.