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Scyther Files/MutualAuthenticationBroken.spdl

+
+hashfunction  hashed;
+hashfunction sharedkey;
+usertype Message;
+usertype SessionKey;
+
+protocol KeyExchange(Monitor,CloudServer)
+{
+	role Monitor
+
+	{
+
+		fresh MonitorValue  : Nonce;
+		var CloudServerValue : Nonce;
+
+		fresh info : 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, {info} sharedkey );
+
+		recv_4(CloudServer,Monitor, {info} sharedkey );	
+
+		claim_Monitor1(Monitor,Niagree);
+		claim_Monitor2(Monitor,Nisynch);
+		claim_Monitor3(Monitor,  Secret, info);
+	
+	}	
+	
+	role CloudServer
+
+	{
+
+		var MonitorValue: Nonce;
+		fresh CloudServerValue: Nonce;
+
+		var info: 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, {info} sharedkey );
+
+		send_4(CloudServer,Monitor, {info} sharedkey );	
+
+		claim_CloudServer1(CloudServer,Niagree);
+		claim_CloudServer2(CloudServer,Nisynch);
+		claim_CloudServer3(CloudServer,  Secret, info);
+
+	}
+}