Esmaeilzadeh Khorasani, Koosha2025-07-212025-07-212025-06-252025-06-252025-06-27http://hdl.handle.net/1993/39165Blockchain interoperability is essential for enabling advanced functionalities in decentralized applications, particularly for secure and reliable interactions across disparate blockchain networks. The Notary scheme is a common approach to achieving interoperability; however, it faces significant challenges: vulnerability to quantum computing threats and the complexities of trust management in dynamic, adversarial environments. We investigate a decentralized, quantum-resistant interoperability framework designed to address these challenges through a novel protocol and trust model. The protocol integrates post-quantum cryptographic techniques, including ML-KEM for key distribution, ML-DSA for digital signatures, and AES-256 for message encryption, ensuring security and resilience against emerging quantum threats. Complementing this, we introduce a dynamic trust model that leverages Popoviciu’s inequality to manage and update reputation scores in real time, enhancing resilience against trust degradation and enabling recovery from malicious behavior and network fluctuations. Experimental evaluation shows that our proposed protocol achieves quantum resistance while maintaining performance comparable to traditional cryptographic approaches. Moreover, the novel trust model provides accurate and dynamic trust computation under varying network conditions, contributing to more robust and trustworthy interoperability.engBlockchain InteroperabilityPost-Quantum CryptographyDynamic Trust Model