Update index.md

Author: daoyuan14

index.md

@@ -1,6 +1,6 @@
-## Vulnerability and Privacy Research (VPR) Lab
+## Verification, Privacy, and Robustness Lab（智能验证、隐私与鲁棒性实验室）
 
-### If you are looking for iExam, click [here](https://vprlab.github.io/iexam/).
+### VPRLab: Advancing the Verification, Privacy protection, and Robustness of AI and LLM systems.
 
 ![Image](https://raw.githubusercontent.com/VPRLab/VPRLab.github.io/master/VPRLabMembers.png)