diff --git a/main/mashape/authentication/AuthenticationUtil.php b/main/mashape/authentication/AuthenticationUtil.php
index b2c0918..23e654d 100755
--- a/main/mashape/authentication/AuthenticationUtil.php
+++ b/main/mashape/authentication/AuthenticationUtil.php
@@ -26,13 +26,8 @@
 
 class AuthenticationUtil {
 
-	public static function generateAuthenticationHeader($publicKey, $privateKey) {
-		$header = "";
-		if (!($publicKey == null || $privateKey == null)) {
-			$hash = hash_hmac("sha1", $publicKey, $privateKey);
-			$header = "X-Mashape-Authorization: " . base64_encode($publicKey . ":" . $hash);
-		}
-		return $header;
+	public static function generateAuthenticationHeader($mashapeKey) {
+		return "X-Mashape-Authorization: " . $mashapeKey;
 	}
 
 }
diff --git a/main/mashape/authentication/MashapeAuthentication.php b/main/mashape/authentication/MashapeAuthentication.php
index d864ba0..e2c55b8 100644
--- a/main/mashape/authentication/MashapeAuthentication.php
+++ b/main/mashape/authentication/MashapeAuthentication.php
@@ -6,8 +6,8 @@ class MashapeAuthentication extends HeaderAuthentication {
 
 	private $headers;
 
-	function __construct($publicKey, $privateKey) {
-		$this->headers = array(AuthenticationUtil::generateAuthenticationHeader($publicKey, $privateKey));
+	function __construct($mashapeKey) {
+		$this->headers = array(AuthenticationUtil::generateAuthenticationHeader($mashapeKey));
 	}
 
 	public function handleHeaders() {