Cryptography-based privacy-preserving large language models: a lifecycle survey of frameworks, methods, and future directions. - Luo, Jinglong; Zhang, Yehong; Zhang, Zhuo; Liu, Shiyu; Dong, Ye; Li, Haoran; Yu, Yue; Wang, Hui; Zhou, Xun; Xu, Zenglin (Artificial Intelligence Review, 2026)