diff --git a/src/lib/WebAuthn/Attestation/Format/None.php b/src/lib/WebAuthn/Attestation/Format/None.php
new file mode 100644
index 0000000..ba95e40
--- /dev/null
+++ b/src/lib/WebAuthn/Attestation/Format/None.php
@@ -0,0 +1,41 @@
+<?php
+
+
+namespace lbuchs\WebAuthn\Attestation\Format;
+use lbuchs\WebAuthn\Attestation\AuthenticatorData;
+use lbuchs\WebAuthn\WebAuthnException;
+
+class None extends FormatBase {
+
+
+    public function __construct($AttestionObject, AuthenticatorData $authenticatorData) {
+        parent::__construct($AttestionObject, $authenticatorData);
+    }
+
+
+    /*
+     * returns the key certificate in PEM format
+     * @return string
+     */
+    public function getCertificatePem() {
+        return null;
+    }
+
+    /**
+     * @param string $clientDataHash
+     */
+    public function validateAttestation($clientDataHash) {
+        return true;
+    }
+
+    /**
+     * validates the certificate against root certificates.
+     * Format 'none' does not contain any ca, so always false.
+     * @param array $rootCas
+     * @return boolean
+     * @throws WebAuthnException
+     */
+    public function validateRootCertificate($rootCas) {
+        return false;
+    }
+}