This fully funded PhD position at Edinburgh Napier University focuses on developing robust and lightweight authentication mechanisms for Internet of Things (IoT) networks, particularly targeting highly constrained devices such as Class 0 and Class 1. The project addresses the critical need for secure, scalable, and resource-efficient authentication protocols in environments where traditional cryptographic solutions are impractical due to computational, storage, and energy limitations. The research will evaluate existing lightweight security mechanisms, design novel authentication protocols, and implement these solutions within popular IoT network systems like Contiki-NG, RIOT-OS, and TinyOS. Performance and security will be assessed through simulation tools (Cooja, NS-3) and real-world testbed experiments, with a focus on resilience against modern attack vectors including Sybil, replay, and flooding attacks. The project aims to demonstrate practical scalability and robustness in applications such as smart healthcare, environmental sensing, and industrial IoT. Applicants should have a strong background in Computer Science, Cyber Security, or Computer Engineering, with skills in IoT, AI/machine learning, programming, and independent research. The studentship covers full UK or international tuition fees and provides a standard living allowance at the RCUK rate (£21,383 per annum). International applicants must cover their own visa and NHS surcharge costs. The application deadline is January 9, 2026, with the studentship starting in October 2026. To apply, candidates must submit a completed application form (quoting project code SCEBE1125), CV, two academic references, a two-page research outline, a motivation statement, and evidence of English proficiency. For informal enquiries, contact Dr BG Ghaleb at b.ghaleb@napier.ac.uk.