diff --git a/src/main/java/com/woozuda/backend/note/entity/NoteContent.java b/src/main/java/com/woozuda/backend/note/entity/NoteContent.java
index 7abb69d..d5d6ce8 100644
--- a/src/main/java/com/woozuda/backend/note/entity/NoteContent.java
+++ b/src/main/java/com/woozuda/backend/note/entity/NoteContent.java
@@ -1,7 +1,9 @@
 package com.woozuda.backend.note.entity;
 
 import com.woozuda.backend.global.entity.BaseTimeEntity;
+import com.woozuda.backend.note.entity.converter.NoteContentConverter;
 import jakarta.persistence.Column;
+import jakarta.persistence.Convert;
 import jakarta.persistence.Entity;
 import jakarta.persistence.FetchType;
 import jakarta.persistence.GeneratedValue;
@@ -34,6 +36,7 @@ public class NoteContent extends BaseTimeEntity {
     private Integer noteOrder;
 
     @Column(length = 2000, nullable = false)
+    @Convert(converter = NoteContentConverter.class)
     private String content; // 회고 부분 내용
 
     private NoteContent(Integer noteOrder, String content) {
diff --git a/src/main/java/com/woozuda/backend/note/entity/converter/AesEncryptor.java b/src/main/java/com/woozuda/backend/note/entity/converter/AesEncryptor.java
new file mode 100644
index 0000000..299757f
--- /dev/null
+++ b/src/main/java/com/woozuda/backend/note/entity/converter/AesEncryptor.java
@@ -0,0 +1,50 @@
+package com.woozuda.backend.note.entity.converter;
+
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.security.crypto.encrypt.Encryptors;
+import org.springframework.security.crypto.encrypt.TextEncryptor;
+import org.springframework.security.crypto.keygen.KeyGenerators;
+import org.springframework.stereotype.Component;
+
+@Component
+@Slf4j
+public class AesEncryptor {
+
+    public static final String SALT_DATA_DELIMITER = "::";
+
+    private final String password;
+
+    public AesEncryptor(@Value("${aes.password}") String password) {
+        this.password = password;
+    }
+
+    public String encrypt(String plainText) {
+        //무작위 salt 생성
+        String salt = KeyGenerators.string().generateKey();
+        TextEncryptor encryptor = Encryptors.delux(password, salt);
+
+        // salt를 암호화된 데이터와 함께 저장
+        return salt + SALT_DATA_DELIMITER + encryptor.encrypt(plainText);
+    }
+
+    public String decrypt(String encryptedText) {
+        // 암호화된 데이터에서 salt 분리
+        String[] parts = encryptedText.split(SALT_DATA_DELIMITER, 2);
+        if (parts.length > 2) {
+            throw new IllegalArgumentException("Invalid encrypted text format");
+        }
+        if (parts.length == 1) {
+            return encryptedText;
+        }
+
+        String salt = parts[0];
+        String cipherText = parts[1];
+
+        TextEncryptor encryptor = Encryptors.delux(password, salt);
+
+        return encryptor.decrypt(cipherText);
+    }
+
+
+}
diff --git a/src/main/java/com/woozuda/backend/note/entity/converter/NoteContentConverter.java b/src/main/java/com/woozuda/backend/note/entity/converter/NoteContentConverter.java
new file mode 100644
index 0000000..170a2cb
--- /dev/null
+++ b/src/main/java/com/woozuda/backend/note/entity/converter/NoteContentConverter.java
@@ -0,0 +1,38 @@
+package com.woozuda.backend.note.entity.converter;
+
+import jakarta.persistence.AttributeConverter;
+import jakarta.persistence.Converter;
+import lombok.RequiredArgsConstructor;
+
+@Converter
+@RequiredArgsConstructor
+public class NoteContentConverter implements AttributeConverter<String, String> {
+
+    private final AesEncryptor aesEncryptor;
+
+    @Override
+    public String convertToDatabaseColumn(String attribute) {
+        if (attribute == null) {
+            return null;
+        }
+
+        try {
+            return aesEncryptor.encrypt(attribute);
+        } catch (Exception e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    @Override
+    public String convertToEntityAttribute(String dbData) {
+        if (dbData == null) {
+            return null;
+        }
+
+        try {
+            return aesEncryptor.decrypt(dbData);
+        } catch (Exception e) {
+            throw new RuntimeException(e);
+        }
+    }
+}
diff --git a/src/main/resources/application-local.yml b/src/main/resources/application-local.yml
index 94f9269..09451b7 100644
--- a/src/main/resources/application-local.yml
+++ b/src/main/resources/application-local.yml
@@ -92,3 +92,6 @@ management:
   endpoint:
     prometheus:
       enabled: true #default
+
+aes:
+  password: "${aes-password}"
diff --git a/src/main/resources/application-release.yml b/src/main/resources/application-release.yml
index c74e1d3..8f8585f 100644
--- a/src/main/resources/application-release.yml
+++ b/src/main/resources/application-release.yml
@@ -90,4 +90,7 @@ management:
       enabled: true #default
 
 logging:
-  config: "classpath:./logback-release.xml"
\ No newline at end of file
+  config: "classpath:./logback-release.xml"
+
+aes:
+  password: "${aes_password}"
\ No newline at end of file
diff --git a/src/test/java/com/woozuda/backend/diary/repository/DiaryRepositoryTest.java b/src/test/java/com/woozuda/backend/diary/repository/DiaryRepositoryTest.java
index 1a0275a..2e94f9e 100644
--- a/src/test/java/com/woozuda/backend/diary/repository/DiaryRepositoryTest.java
+++ b/src/test/java/com/woozuda/backend/diary/repository/DiaryRepositoryTest.java
@@ -3,12 +3,14 @@
 import com.woozuda.backend.account.entity.UserEntity;
 import com.woozuda.backend.diary.dto.response.SingleDiaryResponseDto;
 import com.woozuda.backend.diary.entity.Diary;
+import com.woozuda.backend.note.entity.converter.AesEncryptor;
 import com.woozuda.backend.tag.entity.Tag;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest;
 import org.springframework.boot.test.autoconfigure.orm.jpa.TestEntityManager;
+import org.springframework.boot.test.mock.mockito.MockBean;
 import org.springframework.transaction.annotation.Transactional;
 
 import java.util.List;
@@ -18,6 +20,7 @@
 import static org.assertj.core.api.Assertions.assertThat;
 
 @DataJpaTest
+@MockBean(AesEncryptor.class)
 @Transactional
 class DiaryRepositoryTest {
 
diff --git a/src/test/java/com/woozuda/backend/note/repository/NoteRepositoryTest.java b/src/test/java/com/woozuda/backend/note/repository/NoteRepositoryTest.java
index 59a2baf..172a094 100644
--- a/src/test/java/com/woozuda/backend/note/repository/NoteRepositoryTest.java
+++ b/src/test/java/com/woozuda/backend/note/repository/NoteRepositoryTest.java
@@ -4,7 +4,12 @@
 import com.woozuda.backend.diary.entity.Diary;
 import com.woozuda.backend.note.dto.request.NoteCondRequestDto;
 import com.woozuda.backend.note.dto.response.NoteResponseDto;
-import com.woozuda.backend.note.entity.*;
+import com.woozuda.backend.note.entity.CommonNote;
+import com.woozuda.backend.note.entity.NoteContent;
+import com.woozuda.backend.note.entity.QuestionNote;
+import com.woozuda.backend.note.entity.RetrospectiveNote;
+import com.woozuda.backend.note.entity.converter.AesEncryptor;
+import com.woozuda.backend.note.entity.converter.NoteContentConverter;
 import com.woozuda.backend.question.entity.Question;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.DisplayName;
@@ -12,19 +17,35 @@
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest;
 import org.springframework.boot.test.autoconfigure.orm.jpa.TestEntityManager;
+import org.springframework.boot.test.context.TestConfiguration;
+import org.springframework.context.annotation.Bean;
 import org.springframework.transaction.annotation.Transactional;
 
 import java.time.LocalDate;
 import java.util.List;
 
 import static com.woozuda.backend.account.entity.AiType.PICTURE_NOVEL;
-import static com.woozuda.backend.note.entity.type.Feeling.*;
-import static com.woozuda.backend.note.entity.type.Framework.*;
+import static com.woozuda.backend.note.entity.type.Feeling.ANGER;
+import static com.woozuda.backend.note.entity.type.Feeling.CONTENT;
+import static com.woozuda.backend.note.entity.type.Feeling.DISSATISFACTION;
+import static com.woozuda.backend.note.entity.type.Feeling.JOY;
+import static com.woozuda.backend.note.entity.type.Feeling.NEUTRAL;
+import static com.woozuda.backend.note.entity.type.Feeling.SADNESS;
+import static com.woozuda.backend.note.entity.type.Feeling.TIREDNESS;
+import static com.woozuda.backend.note.entity.type.Framework.FOUR_F_S;
+import static com.woozuda.backend.note.entity.type.Framework.KPT;
+import static com.woozuda.backend.note.entity.type.Framework.PMI;
+import static com.woozuda.backend.note.entity.type.Framework.SCS;
 import static com.woozuda.backend.note.entity.type.Season.FALL;
 import static com.woozuda.backend.note.entity.type.Season.WINTER;
 import static com.woozuda.backend.note.entity.type.Visibility.PRIVATE;
 import static com.woozuda.backend.note.entity.type.Visibility.PUBLIC;
-import static com.woozuda.backend.note.entity.type.Weather.*;
+import static com.woozuda.backend.note.entity.type.Weather.CLEAR;
+import static com.woozuda.backend.note.entity.type.Weather.CLOUDY;
+import static com.woozuda.backend.note.entity.type.Weather.RAIN;
+import static com.woozuda.backend.note.entity.type.Weather.SNOW;
+import static com.woozuda.backend.note.entity.type.Weather.SUNNY;
+import static com.woozuda.backend.note.entity.type.Weather.THUNDERSTORM;
 import static java.time.Month.DECEMBER;
 import static org.assertj.core.api.Assertions.assertThat;
 
@@ -32,6 +53,19 @@
 @Transactional
 class NoteRepositoryTest {
 
+    @TestConfiguration
+    static class NoteContentTestConfig {
+        @Bean
+        public AesEncryptor aesEncryptor() {
+            return new AesEncryptor("test-password");
+        }
+
+        @Bean
+        public NoteContentConverter noteContentConverter(AesEncryptor aesEncryptor) {
+            return new NoteContentConverter(aesEncryptor);
+        }
+    }
+
     LocalDate date1 = LocalDate.of(2024, DECEMBER, 5);
     LocalDate date2 = LocalDate.of(2024, DECEMBER, 6);
 
diff --git a/src/test/java/com/woozuda/backend/note/repository/QuestionRepositoryTest.java b/src/test/java/com/woozuda/backend/note/repository/QuestionRepositoryTest.java
index bffee8a..5cb78be 100644
--- a/src/test/java/com/woozuda/backend/note/repository/QuestionRepositoryTest.java
+++ b/src/test/java/com/woozuda/backend/note/repository/QuestionRepositoryTest.java
@@ -1,5 +1,6 @@
 package com.woozuda.backend.note.repository;
 
+import com.woozuda.backend.note.entity.converter.AesEncryptor;
 import com.woozuda.backend.question.entity.Question;
 import com.woozuda.backend.question.repository.QuestionRepository;
 import org.junit.jupiter.api.DisplayName;
@@ -7,6 +8,7 @@
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest;
 import org.springframework.boot.test.autoconfigure.orm.jpa.TestEntityManager;
+import org.springframework.boot.test.mock.mockito.MockBean;
 import org.springframework.transaction.annotation.Transactional;
 
 import java.time.LocalDate;
@@ -14,6 +16,7 @@
 import static org.assertj.core.api.Assertions.assertThat;
 
 @DataJpaTest
+@MockBean(AesEncryptor.class)
 @Transactional
 class QuestionRepositoryTest {
 
diff --git a/src/test/resources/application.yml b/src/test/resources/application.yml
index 4115cba..ac90476 100644
--- a/src/test/resources/application.yml
+++ b/src/test/resources/application.yml
@@ -71,4 +71,7 @@ openai:
   chat:
     options:
       model: "gpt-3.5-turbo"  # 사용할 AI 모델 (예: gpt-3.5-turbo)
-      temperature: 0.6  # 생성되는 텍스트의 다양성 정도를 조절하는 파라미터 (0.0 ~ 1.0)
\ No newline at end of file
+      temperature: 0.6  # 생성되는 텍스트의 다양성 정도를 조절하는 파라미터 (0.0 ~ 1.0)
+
+aes:
+  password: "aes_password"
\ No newline at end of file