The unprecedented rise of Artificial Intelligence (AI) in recent years has not only revolutionized automation, reasoning, and language understanding but has also introduced new vectors of risk and vulnerability. As AI systems, especially large language models (LLMs), become increasingly embedded in safety-critical domains such as healthcare, finance, and infrastructure, their security becomes not just a technical concern but also a societal imperative. This special issue on AI Security in the Transactions on Artificial Intelligence (TAI) brings together contemporary research on the threats, defenses, and emerging paradigms associated with secure AI deployment.



