diff --git a/backEnd/.gitignore b/backEnd/.gitignore
index c2065bc2..06bebffa 100644
--- a/backEnd/.gitignore
+++ b/backEnd/.gitignore
@@ -35,3 +35,5 @@ out/
 
 ### VS Code ###
 .vscode/
+
+application-key.yml
\ No newline at end of file
diff --git a/backEnd/build.gradle b/backEnd/build.gradle
index 480a9118..d1d3922d 100644
--- a/backEnd/build.gradle
+++ b/backEnd/build.gradle
@@ -1,34 +1,39 @@
 plugins {
-	id 'java'
-	id 'org.springframework.boot' version '3.2.5'
-	id 'io.spring.dependency-management' version '1.1.4'
+    id 'java'
+    id 'org.springframework.boot' version '3.2.5'
+    id 'io.spring.dependency-management' version '1.1.4'
 }
 
 group = 'com.6quiz'
 version = '0.0.1-SNAPSHOT'
 
 java {
-	sourceCompatibility = '21'
+    sourceCompatibility = '21'
 }
 
 configurations {
-	compileOnly {
-		extendsFrom annotationProcessor
-	}
+    compileOnly {
+        extendsFrom annotationProcessor
+    }
 }
 
 repositories {
-	mavenCentral()
+    mavenCentral()
 }
 
 dependencies {
-	implementation 'org.springframework.boot:spring-boot-starter-web'
-	compileOnly 'org.projectlombok:lombok'
-	developmentOnly 'org.springframework.boot:spring-boot-devtools'
-	annotationProcessor 'org.projectlombok:lombok'
-	testImplementation 'org.springframework.boot:spring-boot-starter-test'
+    implementation 'org.springframework.boot:spring-boot-starter-web'
+    implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
+    implementation 'org.springframework.boot:spring-boot-starter-data-mongodb'
+    implementation 'org.springframework.boot:spring-boot-starter-data-redis'
+    compileOnly 'org.projectlombok:lombok'
+    developmentOnly 'org.springframework.boot:spring-boot-devtools'
+    implementation 'com.github.ulisesbocchio:jasypt-spring-boot-starter:3.0.5'
+    annotationProcessor 'org.projectlombok:lombok'
+    testImplementation 'org.springframework.boot:spring-boot-starter-test'
+    runtimeOnly 'com.mysql:mysql-connector-j'
 }
 
 tasks.named('test') {
-	useJUnitPlatform()
+    useJUnitPlatform()
 }
diff --git a/backEnd/src/main/java/com/quiz/ourClass/OurClassApplication.java b/backEnd/src/main/java/com/quiz/ourClass/OurClassApplication.java
index 77dde429..7b5e562a 100644
--- a/backEnd/src/main/java/com/quiz/ourClass/OurClassApplication.java
+++ b/backEnd/src/main/java/com/quiz/ourClass/OurClassApplication.java
@@ -6,8 +6,10 @@
 @SpringBootApplication
 public class OurClassApplication {
 
-	public static void main(String[] args) {
-		SpringApplication.run(OurClassApplication.class, args);
-	}
+    public static void main(String[] args) {
+        SpringApplication app = new SpringApplication(OurClassApplication.class);
+        app.setAdditionalProfiles("dev");
+        app.run(args);
+    }
 
 }
diff --git a/backEnd/src/main/java/com/quiz/ourClass/global/config/JasyptConfig.java b/backEnd/src/main/java/com/quiz/ourClass/global/config/JasyptConfig.java
new file mode 100644
index 00000000..5c7f525b
--- /dev/null
+++ b/backEnd/src/main/java/com/quiz/ourClass/global/config/JasyptConfig.java
@@ -0,0 +1,33 @@
+package com.quiz.ourClass.global.config;
+
+import com.ulisesbocchio.jasyptspringboot.annotation.EnableEncryptableProperties;
+import org.jasypt.encryption.StringEncryptor;
+import org.jasypt.encryption.pbe.PooledPBEStringEncryptor;
+import org.jasypt.encryption.pbe.config.SimpleStringPBEConfig;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+@EnableEncryptableProperties
+public class JasyptConfig {
+
+    @Value("${jasypt.encryptor.key}")
+    String key;
+
+    @Bean(name = "jasyptStringEncryptor")
+    public StringEncryptor stringEncryptor() {
+
+        PooledPBEStringEncryptor encryptor = new PooledPBEStringEncryptor();
+        SimpleStringPBEConfig config = new SimpleStringPBEConfig();
+        config.setPassword(key);
+        config.setAlgorithm("PBEWithMD5AndDES");
+        config.setKeyObtentionIterations("1000");
+        config.setPoolSize("1");
+        config.setProviderName("SunJCE");
+        config.setSaltGeneratorClassName("org.jasypt.salt.RandomSaltGenerator");
+        config.setStringOutputType("base64");
+        encryptor.setConfig(config);
+        return encryptor;
+    }
+}
\ No newline at end of file
diff --git a/backEnd/src/main/resources/application-db.yml b/backEnd/src/main/resources/application-db.yml
new file mode 100644
index 00000000..2cd3090f
--- /dev/null
+++ b/backEnd/src/main/resources/application-db.yml
@@ -0,0 +1,45 @@
+---
+spring:
+  config:
+    activate:
+      on-profile: db-dev
+  datasource:
+    driver-class-name: com.mysql.cj.jdbc.Driver
+    url: ENC(BK5guqCyFgcXz9XYMj6Ih6kXS/4ruxW1RVYIUxX1KXRFMmrja/o4MSck/tEjIzvhUGvAQPlX8Upj1TScOYre4LVrulpuc2AlanWUEpCRmJ1Bv6aJniivvQ==)
+    username: ENC(MYQ3aT1VJAbQINjDNwI63SdAy0klZQNS)
+    password: ENC(hubtzmA3yjR5UR4QidrFMhpzpZC3r4/q)
+  data:
+    mongodb:
+      host: ENC(RlbaApSBGOY9aZpoa/Q+8uahT22Cg02g)
+      port: ENC(HwQDnCJWUUC+uws46h5EQA==)
+      database: ENC(cSzOXYx2Vpfz+c7GMEPdLg==)
+      username: ENC(AmV/z9JTFSh4og1r4s4nKL4gwCOotshL)
+      password: ENC(V0DO82Nf0nvfjfFyQwzRfXABg1qBF3rGAwmGQacDLGA=)
+      authentication-database: ENC(z33qIA0NJs/P0DdjUma0gA==)
+    redis:
+      host: ENC(tCytoj2btfmkEuW78BEnFZAa1DZdT8lp)
+      port: ENC(knTIBM9PALqlEPofKSdVTQ==)
+      password: ENC(5tNR7TfRtIj69kmaPS/JC7P9oqwfW/ooTu9MD/GK6E4=)
+---
+spring:
+  config:
+    activate:
+      on-profile: db-prod
+  datasource:
+    driver-class-name: com.mysql.cj.jdbc.Driver
+    url: ENC(Y+5AD5d380frx9HYUEyichTve4p/yUn8NtmNW2/4NQJogsrnIXUgBTuHn/lMNbovctNVRjti0p+gkyEJwPMgMHwCGgaopQ5oLZjMiQf0MUvvIKDqQywZ/Q==)
+    username: ENC(fVboFO5wpKzKNThGbtQLLkv2ziEk4Gra)
+    password: ENC(Kc3wHJBq99bC2b2BGILzyROMvdqxv6I+)
+  data:
+    mongodb:
+      host: ENC(UWHLjm0A12FTs4ZO6zEZ50x/C8q8tcHp)
+      port: ENC(hZDOVAQPdwQV4IcmgI4vrw==)
+      database: ENC(xZFJK/ae+pvLIA0sWntWBw==)
+      username: ENC(naBYQwC7jh6BkjGPvBxZvlnof82aw0ZP)
+      password: ENC(fZpGZe/l//EQWi3vdI4e923/k9oyfGFHzuHvUDUAHBI=)
+      authentication-database: ENC(U862aAGiOT9PZDT3e8nnHA==)
+    redis:
+      host: ENC(tCytoj2btfmkEuW78BEnFZAa1DZdT8lp)
+      port: ENC(knTIBM9PALqlEPofKSdVTQ==)
+      password: ENC(OjP5uzhau4FAOvF31CrSrfCCLxY6gRK9IELgunCEwBY=)
+---
diff --git a/backEnd/src/main/resources/application.properties b/backEnd/src/main/resources/application.properties
deleted file mode 100644
index db3ec8c3..00000000
--- a/backEnd/src/main/resources/application.properties
+++ /dev/null
@@ -1 +0,0 @@
-spring.application.name=ourClass
diff --git a/backEnd/src/main/resources/application.yml b/backEnd/src/main/resources/application.yml
new file mode 100644
index 00000000..f866be00
--- /dev/null
+++ b/backEnd/src/main/resources/application.yml
@@ -0,0 +1,19 @@
+server:
+  port: 8080
+  servlet:
+    encoding:
+      charset: UTF-8
+      enabled: true
+      force: true
+    context-path: /api
+---
+spring:
+  profiles:
+    group:
+      dev:
+        - db-dev
+      prod:
+        - db-prod
+    include:
+      - key
+      - db
\ No newline at end of file