diff --git a/pages/总复习2023t1.md b/pages/总复习2023t1.md
index e844433..d1348be 100644
--- a/pages/总复习2023t1.md
+++ b/pages/总复习2023t1.md
@@ -2257,6 +2257,12 @@
 							- Commercial
 							- Technical
 					- Key concepts
+						- Vulnerabilities :-> weakness or flaw in the information system that can
+						  be exploited
+						- Threats :-> anything that can cause harm to an information
+						  system – successful exploits of vulnerabilities
+						- Risks :->
+						- Safeguards
 					- Risk management
 	- LATER 概率论 (隔了一个周末)
 	  collapsed:: true