Hierarchies of keys in secure multicast communications
Journal of Computer Security
Robust and efficient authentication of video stream broadcasting
ACM Transactions on Information and System Security (TISSEC)
Challenging the feasibility of authentication mechanisms for P2P live streaming
Proceedings of the 6th Latin America Networking Conference
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Live streaming is one of many applications where data is continuously created, and has to be quickly distributed among a large number of users. The peer-to-peer paradigm is thereby attracting interest with the prospect of overcoming scalability issues of more centralized approaches. Since data blocks travel along multiple (possibly malicious) peers, authenticating the origin of blocks becomes of prime importance to guarantee safety and reliability. The asymmetry of a single source and an arbitrary number of untrusted receivers requires the use of digital signatures and public key cryptography in general. This paper proposes a new signature scheme for broadcast {authentication} tailored towards peer-to-peer systems to overcome limitations of traditional approaches based on signature schemes like RSA and DSA, most notably in terms of delays, signature size, and computational complexity. It may further be of practical interest for other real-time applications such as massive multiplayer peer-to-peer gaming.