Welcome to the Proceedings of the 2026 11th International Conference on Sustainable Information Engineering and Technology (SIET 2026). The theme for SIET 2026 was "Intelligent and Secure Systems in Large-Scale Connected Digital Environments". ISET is held to bring together academia, researchers, business entrepreneurs, practitioners, and policymakers who are responsible for applying information engineering and technology by leveraging intelligent computing to create and enabling a smart environment. Nowadays, the advancement of technologies, coupled with hardware and software-based services, has made the possibility of human-environment engagement and interaction more seamless. Since humans have different conditions and different ways to engage and interact with their immediate surroundings, various aspects from sensing technology to computer processing techniques are required for a smart environment for supporting the future.

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