Title
Attackers, Packets, and Puzzles: On DenialofService Prevention in Local Area Networks,Used
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We tackle the problem of securing communication in Local Area Networks (LANs) and making it resistant against DenialofService (DoS) attacks. Our first contribution is the Cryptographic Link Layer (CLL) a comprehensive security protocol that provides authentication and confidentiality between neighboring hosts from the link layer upwards. Verifying digital signatures in the handshake phase of CLL is an expensive task compared to symmetrickey operations. Thus, it may become a target for new DoS attacks. We introduce a countermeasure against DoS flooding attacks on publickey handshakes in LANs, called counterflooding. A known approach against DoS attacks in the Internet are client puzzles. However, existing client puzzle schemes have drawbacks when being applied in LANs. We propose a novel, nonparallelizable scheme for client puzzles based on the computation of square roots modulo a prime. By introducing a secure client puzzle architecture we provide a solid basis to safely employ noninteractive client puzzles. In our final contribution, we pursue the idea of cryptographic puzzles beyond DoS protection and propose an offline submission protocol based on RSA timelock puzzles.
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