Efficient and secure multiparty summation without semi-honest third-party

In modern distributed computing systems, ensuring the security and privacy of data across numerous distributed devices is paramount. We propose an efficient and verifiable multiparty summation protocol using public-key cryptography. Each participant can securely share encrypted data with attached validity proofs, enabling anyone to independently verify and compute the final result. This decentralized protocol eliminates the need for a semi-honest third party, enhancing resilience against active attacks from malicious participants and observers. Additionally, it removes the requirement for secret channels, making it ideal for public networks. This design significantly reduces overhead while ensuring robust security. Experimental results demonstrate the efficiency and scalability of our protocol, highlighting its potential for practical applications in privacy-preserving computations across medical, military, and commercial domains.