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COCA: A Secure Distributed Online

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COCA (Cornell OnLine Certification Authority) is a secure and fault-tolerant online certification authority designed to operate in both local and Internet environments. It integrates Byzantine quorum systems with proactive recovery protocols to ensure availability and security against mobile adversaries. COCA operates under weak assumptions about communication reliability and execution timing, allowing it to withstand various denial-of-service attacks. The system employs threshold cryptography for signing certificates, ensuring that at least a majority of servers must be correct to produce valid signatures. Experimental results demonstrate COCA's effectiveness in resisting attacks while providing quantitative performance evaluations.

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