diff --git a/pages/总复习2023t1.md b/pages/总复习2023t1.md
index 068d7a2..e844433 100644
--- a/pages/总复习2023t1.md
+++ b/pages/总复习2023t1.md
@@ -2210,8 +2210,25 @@
 									  entry of information, authorization, antivirus
 									- Compromising integrity :-> (intentional) employee or
 									  external attacks; (accidental) employee error
-									-
+								- Authentication is :-> the process of validating the
+								  identity of a registered user or process before
+								  enabling access to protected networks and systems.
+									- Analogue
+										- signatures, handwriting, in person attestation,
+										  witnesses, notary
+									- Digital
+										- username and password, digital signatures,
+										  fingerprints or face recognition
 								- availability of information
+									- Availability is :-> the security goal of making sure
+									  information systems are reliable
+									- Individuals with proper permission can use systems
+									  and retrieve data in a dependable and timely
+									  manner
+									- Ensuring availability :-> recovery plans, backup
+									  systems
+									- Compromising availability :-> (intentional) denial of
+									  service (DoS) attack, (accidental) outage
 						- Privacy and Data Protection
 						  collapsed:: true
 							- Data privacy are the regulations, or policies, that