A hоspitаl deplоys а lаrge-scale netwоrk of wearable medical monitoring devices to continuously track patient vitals. These devices must enforce secure authentication but are severely constrained by low memory, limited processing power, and battery life. Security architects are evaluating different access control frameworks to enforce least privilege while ensuring responsiveness and energy efficiency at the edge. Which of the following access control methods would likely impose the greatest computational and policy management burden in this setting making it the least suitable choice?