diff --git a/src/main/java/externalApp/externalApp/src/Main.java b/src/main/java/externalApp/externalApp/src/Main.java
index 3813182..e0197e0 100644
--- a/src/main/java/externalApp/externalApp/src/Main.java
+++ b/src/main/java/externalApp/externalApp/src/Main.java
@@ -5,7 +5,7 @@ import common.common.src.logger.Logger;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.databind.node.ObjectNode;
 
-import javax.net.ssl.HttpsURLConnection;
+import javax.net.ssl.*;
 import java.io.*;
 import java.net.URI;
 import java.net.URISyntaxException;
@@ -16,7 +16,9 @@ import java.security.cert.CertificateException;
 import java.util.Base64;
 
 public class Main {
-    public static void main(String[] args) throws IOException, KeyStoreException, UnrecoverableKeyException, NoSuchAlgorithmException, InvalidKeyException, SignatureException, URISyntaxException {
+    private static String CERT_FOLDER = "assets/certs/";
+
+    public static void main(String[] args) throws IOException, KeyStoreException, UnrecoverableKeyException, NoSuchAlgorithmException, InvalidKeyException, SignatureException, URISyntaxException, CertificateException, KeyManagementException {
         BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
         System.out.println("Quel est la date d'expiration de la carte de crédit ? (MM/AA)");
         String expirationDate = br.readLine();
@@ -34,12 +36,12 @@ public class Main {
 
         // Signer le JSON
         KeyStore keyStore = KeyStore.getInstance("PKCS12");
-        try (FileInputStream pkFile = new FileInputStream("ma_cle.p12")) {
+        try (FileInputStream pkFile = new FileInputStream(CERT_FOLDER + "externalApp.p12")) {
             keyStore.load(pkFile, "heplhepl".toCharArray());
         } catch (CertificateException | NoSuchAlgorithmException e) {
             throw new RuntimeException(e);
         }
-        PrivateKey privateKey = (PrivateKey) keyStore.getKey("TODO : nom de la clé dans le trustore", "hepl".toCharArray());
+        PrivateKey privateKey = (PrivateKey) keyStore.getKey("externalApp", "heplhepl".toCharArray());
         Signature signature = Signature.getInstance("SHA256withRSA");
         signature.initSign(privateKey);
         signature.update(jsonString.getBytes(StandardCharsets.UTF_8));
@@ -54,21 +56,50 @@ public class Main {
 
         String finalPayload = mapper.writeValueAsString(finalJson);
 
-        // Envoi à l'ACS
-        Logger.displayInfo("Envoi des informations au service d'authentification sur le port " + Ports.PORT_AUTH + " à l'hôte " + Ports.ACS_HOST);
+        // === Envoi à l'ACS ===
+        Logger.displayInfo("Envoi des informations au service d'authentification à l'hôte " + Ports.ACS_HOST + ":" + Ports.PORT_AUTH);
         URL url = new URI("https://" + Ports.ACS_HOST + ":" + Ports.PORT_AUTH).toURL();
-        HttpsURLConnection con = (HttpsURLConnection) url.openConnection();
 
-        con.setRequestMethod("POST");
-        con.setRequestProperty("Content-Type", "application/json");
-        con.setDoOutput(true);
+        // Gestion des Keystore et Truststore
+        KeyManagerFactory kmf = KeyManagerFactory.getInstance("SunX509");
+        kmf.init(keyStore, "heplhepl".toCharArray());
 
-        try (OutputStream os = con.getOutputStream()) {
-            os.write(finalPayload.getBytes(StandardCharsets.UTF_8));
-            Logger.displaySent("Payload final envoyé : " + finalPayload);
+        KeyStore ts = KeyStore.getInstance("JKS");
+        try (FileInputStream fis = new FileInputStream("assets/certs/acs-trust.jks")) {
+            ts.load(fis, "heplhepl".toCharArray());
         }
+        TrustManagerFactory tmf = TrustManagerFactory.getInstance("SunX509");
+        tmf.init(ts);
 
-        int responseCode = con.getResponseCode();
-        Logger.displayReceived("Code de réponse reçu : " + responseCode);
+        // SSL Connection
+        SSLContext sslContext = SSLContext.getInstance("TLS");
+        sslContext.init(kmf.getKeyManagers(), tmf.getTrustManagers(), null);
+        SSLSocketFactory factory = sslContext.getSocketFactory();
+
+        try (SSLSocket sslSocket = (SSLSocket) factory.createSocket(Ports.ACS_HOST, Ports.PORT_AUTH)) {
+
+            // Démarrage du handshake TLS
+            sslSocket.startHandshake();
+
+            Logger.displayInfo("Connexion SSL établie avec " + Ports.ACS_HOST + ":" + Ports.PORT_AUTH);
+
+            // 4. Envoi des données brutes (JSON signé)
+            OutputStream out = sslSocket.getOutputStream();
+            out.write(finalPayload.getBytes(StandardCharsets.UTF_8));
+            out.flush();
+
+            Logger.displaySent("Payload envoyé en brut : " + finalPayload);
+
+            // 5. Lecture réponse brute
+            BufferedReader reader = new BufferedReader(new InputStreamReader(sslSocket.getInputStream()));
+
+            StringBuilder response = new StringBuilder();
+            String line;
+            while ((line = reader.readLine()) != null) {
+                response.append(line);
+            }
+
+            Logger.displayReceived("Réponse brute reçue : " + response.toString());
+        }
     }
 }