Cryptographic coin-tossing is a protocol that enables two or more distrusting parties to jointly generate a random bit in a fair and verifiable manner. Even if one party attempts to cheat, the protocol ensures that the outcome remains unbiased or that the cheating attempt is detected. This primitive is foundational for achieving fairness in distributed computations and decision-making processes where no trusted third party exists. It relies on cryptographic commitments and challenge-response mechanisms.
Context
This concept holds high relevance in the design of secure multi-party computation protocols and decentralized applications requiring fair randomness. For instance, blockchain-based gaming, lotteries, and decentralized autonomous organization governance mechanisms benefit from verifiable randomness sources. Research continues to focus on improving the efficiency and robustness of cryptographic coin-tossing protocols, especially in adversarial environments where participants may attempt to manipulate outcomes.
A novel committee-based protocol reduces asynchronous Byzantine agreement communication from cubic to quadratic, enabling practical fault-tolerant state machine replication.
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