A2UA: An Auditable Anonymous User Authentication Protocol Based on Blockchain for Cloud Services[J] IEEE TRANSACTIONS ON CLOUD COMPUTING 2023(11) Lyu, Qiuyun Li, Hao Deng, Zhining Wang, Jingyu Ren, Yizhi Zheng, Ning Liu, Junliang Liu, Huaping Choo, Kim-Kwang Raymond
