diff --git a/Scyther Files/MutualAuthentication.spdl b/Scyther Files/MutualAuthentication.spdl
new file mode 100644
index 0000000000000000000000000000000000000000..4906eecf2099230071c0400608f03b4afd1179b5
--- /dev/null
+++ b/Scyther Files/MutualAuthentication.spdl	
@@ -0,0 +1,56 @@
+
+hashfunction  hashed;
+hashfunction sharedkey;
+usertype Message;
+usertype SessionKey;
+
+protocol MutualAuthentication(Monitor,CloudServer)
+{
+	role Monitor
+
+	{
+
+		fresh MonitorValue  : Nonce;
+		var CloudServerValue : Nonce;
+
+		fresh MonitorInformation : Message;
+		var CloudServerInformation: Message;
+		fresh sharedkey: SessionKey;
+
+
+		send_1(Monitor,CloudServer,{Monitor,MonitorValue}pk(CloudServer));
+		recv_2(CloudServer,Monitor, {CloudServerValue,hashed(MonitorValue),CloudServer}pk(Monitor));
+		send_3(Monitor,CloudServer,{CloudServerValue, MonitorInformation} sharedkey );
+		recv_4(CloudServer,Monitor,{MonitorValue,CloudServerInformation} sharedkey);
+		
+		claim_Monitor1(Monitor,Niagree);
+		claim_Monitor2(Monitor,Nisynch);
+		claim_Monitor3(Monitor,  Secret, CloudServerInformation);
+		claim_Monitor4(Monitor,Alive);
+
+
+	}	
+	
+	role CloudServer
+
+	{
+
+		var MonitorValue: Nonce;
+		fresh CloudServerValue: Nonce;
+
+		fresh CloudServerInformation: Message;
+		var MonitorInformation: Message;
+		var sharedkey: SessionKey;
+
+		recv_1(Monitor,CloudServer,{Monitor,MonitorValue}pk(CloudServer));
+		send_2(CloudServer,Monitor, {CloudServerValue,hashed(MonitorValue),CloudServer}pk(Monitor));
+		recv_3(Monitor,CloudServer, {CloudServerValue, MonitorInformation} sharedkey );
+		send_4(CloudServer,Monitor,{MonitorValue,CloudServerInformation} sharedkey);
+		
+		claim_CloudServer1(CloudServer,Niagree);
+		claim_CloudServer2(CloudServer,Nisynch);
+		claim_CloudServer3(CloudServer,  Secret, MonitorInformation);
+		claim_CloudServer4(CloudServer,Alive);
+
+	}
+}