diff --git a/MobileAuthApp/app/src/main/java/com/tarkvaraprojekt/mobileauthapp/NFC/Comms.java b/MobileAuthApp/app/src/main/java/com/tarkvaraprojekt/mobileauthapp/NFC/Comms.java
index e9cce29..a4d184b 100644
--- a/MobileAuthApp/app/src/main/java/com/tarkvaraprojekt/mobileauthapp/NFC/Comms.java
+++ b/MobileAuthApp/app/src/main/java/com/tarkvaraprojekt/mobileauthapp/NFC/Comms.java
@@ -95,6 +95,10 @@ public class Comms {
         keyMAC = keys[1];
     }
 
+    public byte[] getAuthenticationCertificate() {
+        return new byte[0];
+    }
+
     /**
      * Calculates the message authentication code
      *
diff --git a/MobileAuthApp/app/src/main/java/com/tarkvaraprojekt/mobileauthapp/auth/Authenticator.kt b/MobileAuthApp/app/src/main/java/com/tarkvaraprojekt/mobileauthapp/auth/Authenticator.kt
new file mode 100644
index 0000000..a92d716
--- /dev/null
+++ b/MobileAuthApp/app/src/main/java/com/tarkvaraprojekt/mobileauthapp/auth/Authenticator.kt
@@ -0,0 +1,22 @@
+package com.tarkvaraprojekt.mobileauthapp.auth
+
+import android.nfc.tech.IsoDep
+import com.tarkvaraprojekt.mobileauthapp.NFC.Comms
+import java.math.BigInteger
+
+class Authenticator(val comms : Comms) {
+
+    public fun authenticate(nonce: BigInteger, challengeUrl: String, pin1: String) {
+
+        // Ask PIN 1 from the user and get the authentication certificate from the ID card.
+        val authenticationCertificate : ByteArray = comms.getAuthenticationCertificate();
+
+        // Create the authentication token (OpenID X509)
+
+        // Hash the authentication token.
+
+        // Send the authentication token hash to the ID card for signing and get signed authentication token as response.
+
+        // Return the signed authentication token.
+    }
+}
\ No newline at end of file