diff --git a/.idea/misc.xml b/.idea/misc.xml
index 1736f05..c776a8f 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -7,6 +7,7 @@
         <entry key="app/src/main/res/drawable/ic_launcher_background.xml" value="0.3859375" />
         <entry key="app/src/main/res/drawable/ic_launcher_foreground.xml" value="0.2234375" />
         <entry key="app/src/main/res/drawable/splashscreen.xml" value="0.3859375" />
+        <entry key="app/src/main/res/layout/activity_certs_manager.xml" value="0.29483695652173914" />
         <entry key="app/src/main/res/layout/content_certs.xml" value="0.29483695652173914" />
         <entry key="app/src/main/res/layout/fragment_first.xml" value="0.29483695652173914" />
         <entry key="app/src/main/res/layout/fragment_second.xml" value="0.29483695652173914" />
diff --git a/app/build.gradle b/app/build.gradle
index 950e3f1..6a6269d 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -37,6 +37,7 @@ dependencies {
     implementation 'androidx.appcompat:appcompat:1.4.0'
     implementation 'com.google.android.material:material:1.4.0'
     implementation 'androidx.constraintlayout:constraintlayout:2.1.2'
+    implementation 'androidx.preference:preference:1.2.0'
     testImplementation 'junit:junit:4.+'
     androidTestImplementation 'androidx.test.ext:junit:1.1.3'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index aeae542..f64e8bc 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -3,14 +3,17 @@
     package="org.communiquons.dccaggregator">
 
     <application
+        android:name=".DCCAggregator"
         android:allowBackup="false"
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/Theme.DCCAggregator">
+
+        <!-- Main activity -->
         <activity
-            android:name=".MainActivity"
+            android:name=".activities.MainActivity"
             android:exported="true"
             android:theme="@style/SplashTheme">
             <intent-filter>
@@ -19,6 +22,13 @@
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
+
+
+        <!-- Manage certificates -->
+        <activity
+            android:name=".activities.CertsManager"
+            android:label="@string/activity_certsmanagers"
+            android:exported="false" />
     </application>
 
 </manifest>
\ No newline at end of file
diff --git a/app/src/main/java/org/communiquons/dccaggregator/DCCAggregator.kt b/app/src/main/java/org/communiquons/dccaggregator/DCCAggregator.kt
new file mode 100644
index 0000000..9776061
--- /dev/null
+++ b/app/src/main/java/org/communiquons/dccaggregator/DCCAggregator.kt
@@ -0,0 +1,10 @@
+package org.communiquons.dccaggregator
+
+import android.app.Application
+import org.communiquons.dccaggregator.helper.CertificatesList
+
+class DCCAggregator : Application() {
+    val certManager by lazy {
+        CertificatesList(this)
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/org/communiquons/dccaggregator/MainActivity.kt b/app/src/main/java/org/communiquons/dccaggregator/MainActivity.kt
deleted file mode 100644
index 8ce4df5..0000000
--- a/app/src/main/java/org/communiquons/dccaggregator/MainActivity.kt
+++ /dev/null
@@ -1,16 +0,0 @@
-package org.communiquons.dccaggregator
-
-import android.os.Bundle
-import androidx.appcompat.app.AppCompatActivity
-import androidx.appcompat.app.AppCompatDelegate
-
-class MainActivity : AppCompatActivity() {
-    override fun onCreate(savedInstanceState: Bundle?) {
-        super.onCreate(savedInstanceState)
-        setTheme(R.style.Theme_DCCAggregator)
-        setContentView(R.layout.activity_main)
-
-
-        AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/java/org/communiquons/dccaggregator/activities/CertsManager.kt b/app/src/main/java/org/communiquons/dccaggregator/activities/CertsManager.kt
new file mode 100644
index 0000000..4132423
--- /dev/null
+++ b/app/src/main/java/org/communiquons/dccaggregator/activities/CertsManager.kt
@@ -0,0 +1,24 @@
+package org.communiquons.dccaggregator.activities
+
+import android.os.Bundle
+import android.view.MenuItem
+import androidx.appcompat.app.AppCompatActivity
+import org.communiquons.dccaggregator.R
+
+class CertsManager : AppCompatActivity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_certs_manager)
+
+        supportActionBar?.setDisplayHomeAsUpEnabled(true)
+    }
+
+    override fun onOptionsItemSelected(item: MenuItem): Boolean {
+        if (item.itemId == android.R.id.home) {
+            finish()
+            return true
+        }
+
+        return super.onOptionsItemSelected(item)
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/org/communiquons/dccaggregator/activities/MainActivity.kt b/app/src/main/java/org/communiquons/dccaggregator/activities/MainActivity.kt
new file mode 100644
index 0000000..4ccedf3
--- /dev/null
+++ b/app/src/main/java/org/communiquons/dccaggregator/activities/MainActivity.kt
@@ -0,0 +1,30 @@
+package org.communiquons.dccaggregator.activities
+
+import android.content.Intent
+import android.os.Bundle
+import androidx.appcompat.app.AppCompatActivity
+import androidx.appcompat.app.AppCompatDelegate
+import org.communiquons.dccaggregator.DCCAggregator
+import org.communiquons.dccaggregator.R
+
+class MainActivity : AppCompatActivity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setTheme(R.style.Theme_DCCAggregator)
+        setContentView(R.layout.activity_main)
+
+        AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES)
+    }
+
+    override fun onResume() {
+        super.onResume()
+
+        // On first launch, start certificates manager first
+        if (!(application as DCCAggregator).certManager.hasGeneratedCertificate)
+            openCertsManager()
+    }
+
+    fun openCertsManager() {
+        startActivity(Intent(this, CertsManager::class.java))
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/org/communiquons/dccaggregator/helper/CertificatesList.kt b/app/src/main/java/org/communiquons/dccaggregator/helper/CertificatesList.kt
new file mode 100644
index 0000000..7aa8387
--- /dev/null
+++ b/app/src/main/java/org/communiquons/dccaggregator/helper/CertificatesList.kt
@@ -0,0 +1,10 @@
+package org.communiquons.dccaggregator.helper
+
+import android.content.Context
+import androidx.preference.PreferenceManager
+
+class CertificatesList(context: Context) {
+    private val prefsManager = PreferenceManager.getDefaultSharedPreferences(context)
+
+    val hasGeneratedCertificate get() = false
+}
\ No newline at end of file
diff --git a/app/src/main/res/layout/activity_certs_manager.xml b/app/src/main/res/layout/activity_certs_manager.xml
new file mode 100644
index 0000000..1d676c6
--- /dev/null
+++ b/app/src/main/res/layout/activity_certs_manager.xml
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".activities.CertsManager">
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 4fc2444..fd8eba3 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -4,7 +4,7 @@
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    tools:context=".MainActivity">
+    tools:context=".activities.MainActivity">
 
     <TextView
         android:layout_width="wrap_content"
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 29cd740..054137b 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1,3 +1,4 @@
 <resources>
     <string name="app_name">DCCAggregator</string>
+    <string name="activity_certsmanagers">Input certificates</string>
 </resources>
\ No newline at end of file