diff --git a/spdl/ns3-nisynch.spdl b/spdl/ns3-nisynch.spdl
new file mode 100644
index 0000000..723bbab
--- /dev/null
+++ b/spdl/ns3-nisynch.spdl
@@ -0,0 +1,39 @@
+const pk: Function;
+secret sk: Function;
+inversekeys (pk,sk);
+
+protocol ns3(I,R)
+{
+	role I
+	{
+		const ni: Nonce;
+		var nr: Nonce;
+
+		send_1(I,R, {I,ni}pk(R) );
+		read_2(R,I, {ni,nr}pk(I) );
+		send_3(I,R, {nr}pk(R) );
+		claim_4(I,Nisynch);
+	}	
+	
+	role R
+	{
+		var ni: Nonce;
+		const nr: Nonce;
+
+		read_1(I,R, {I,ni}pk(R) );
+		send_2(R,I, {ni,nr}pk(I) );
+		read_3(I,R, {nr}pk(R) );
+		claim_5(R,Nisynch);
+	}
+}
+
+const Alice,Bob,Eve: Agent;
+
+untrusted Eve;
+const nc: Nonce;
+compromised sk(Eve);
+
+run ns3.I(Agent,Agent);
+run ns3.R(Agent,Agent);
+run ns3.I(Agent,Agent);
+run ns3.R(Agent,Agent);
diff --git a/spdl/nsl3-nisynch.spdl b/spdl/nsl3-nisynch.spdl
new file mode 100644
index 0000000..2baa020
--- /dev/null
+++ b/spdl/nsl3-nisynch.spdl
@@ -0,0 +1,39 @@
+const pk: Function;
+secret sk: Function;
+inversekeys (pk,sk);
+
+protocol nsl3(I,R)
+{
+	role I
+	{
+		const ni: Nonce;
+		var nr: Nonce;
+
+		send_1(I,R, {I,ni}pk(R) );
+		read_2(R,I, {ni,nr,R}pk(I) );
+		send_3(I,R, {nr}pk(R) );
+		claim_4(I,Nisynch);
+	}	
+	
+	role R
+	{
+		var ni: Nonce;
+		const nr: Nonce;
+
+		read_1(I,R, {I,ni}pk(R) );
+		send_2(R,I, {ni,nr,R}pk(I) );
+		read_3(I,R, {nr}pk(R) );
+		claim_5(I,Nisynch);
+	}
+}
+
+const Alice,Bob,Eve: Agent;
+
+untrusted Eve;
+const nc: Nonce;
+compromised sk(Eve);
+
+run nsl3.I(Agent,Agent);
+run nsl3.R(Agent,Agent);
+run nsl3.I(Agent,Agent);
+run nsl3.R(Agent,Agent);