Sijjad AliShuaib Ahmed WadhoAun YichietNayem Uddin PrinceGan Ming Lee0000-0003-4426-9274Chen Kang Lee2025-09-302025-09-302025-0610.1016/j.eij.2025.100660https://dspace-cris.utar.edu.my/handle/123456789/11392In this paper, we propose a novel approach to enhance the security of cloud collaboration while addressing key challenges in cloud computing. The proposed scheme effectively mitigates eavesdropping and threshold attacks, significantly bolstering the security of the cloud environment. Through rigorous performance evaluation, we demonstrate that our method reduces communication overhead and improves resource efficiency compared to existing solutions. Additionally, we introduce a transformation of the dynamic context secret (DCS) into a (t, n) secret sharing scheme, improving its flexibility and addressing critical security issues. This innovative approach represents a significant advancement in cloud collaboration security, offering a measurable improvement over current models. By strengthening both the security and efficiency of cloud environments, our scheme lays the groundwork for more robust and secure cloud computing frameworks.enSecret sharing schemeCloud computing securityInformation theoretic securityThreshold cryptographyContextual updatesINTRUSION DETECTIONPRIVACYjournal-article