Fair and Efficient Helper-Aided MPC with Cheater Identification

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Secure multi-party computation (MPC) enables privacy-preserving tasks such as auctions and voting. In practice, more than half of the parties may collude, making security against a dishonest majority desirable. Unfortunately, dishonest-majority MPC suffers from high communication and can achieve only abort security. For instance, in an auction, an adversary may abort after learning the outcome and rerun the protocol with a higher bid. Helper-aided MPC mitigates these limitations by introducin