Very strong. I think the institutions that have done well in cryptography are (now): Institute of Information Engineering and Software, Chinese Academy of Sciences, Shanghai Jiaotong University, xidian university, Information Engineering University, Shandong University, Tsinghua University, Guangzhou University, Wuhan University, etc. Among them, Information Engineering University is very strong in cryptography, but because they do a lot of military work, they are still relatively low-key and many achievements cannot be published!

I hope I can help you!