diff --git a/protocols/misc/nst1.spdl b/protocols/misc/nst1.spdl
index c964682..c915f61 100644
--- a/protocols/misc/nst1.spdl
+++ b/protocols/misc/nst1.spdl
@@ -34,6 +34,8 @@ protocol neustub(I,R,S)
         send_1(I,R, I, Ni);
         read_!3(S,I, { R,Ni,Kir,Tb}k(I,S), T, Nr);
         send_4(I,R,T,{Nr}Kir);
+
+	send_!chain(I,R, { R,Tb,Kir }k(I,S), T);
         
         claim_I1(I,Secret, Kir);
         claim_I2(I,Niagree);
@@ -48,12 +50,15 @@ protocol neustub(I,R,S)
         var Kir: SessionKey;
         const Tb: TimeStamp;
         var T: Ticket;
+
+	const g: Ticket;
         
         read_1(I,R, I, Ni);
-        send_!2(R,S, R, {I, Ni, Tb}k(R,S),Nr);
+        send_!2(R,S, R, {I, Ni, Tb, g}k(R,S),Nr);
         read_4(I,R,{I,Kir,Tb}k(R,S),{Nr}Kir);
     
         claim_R1(R,Secret, Kir);
+        claim_R5(R,Secret, g);
         claim_R2(R,Niagree);
         claim_R3(R,Nisynch);
         claim_R4(R,Empty,(Fresh,Kir));
@@ -65,7 +70,9 @@ protocol neustub(I,R,S)
         const Kir: SessionKey;
         var Tb: TimeStamp;
 
-        read_!2(R,S, R, {I,Ni,Tb}k(R,S), Nr);
+	var g: Ticket;
+
+        read_!2(R,S, R, {I,Ni,Tb, g}k(R,S), Nr);
         send_!3(S,I, { R, Ni, Kir, Tb}k(I,S), { I,Kir,Tb}k(R,S),Nr );
     }
 }
diff --git a/protocols/misc/nst2.spdl b/protocols/misc/nst2.spdl
index 32ef81c..431c36d 100644
--- a/protocols/misc/nst2.spdl
+++ b/protocols/misc/nst2.spdl
@@ -29,12 +29,21 @@ protocol neustub^Repeat(I,R,S)
     {
         const Mi: Nonce;
         var Mr: Nonce;
-        const Kir: SessionKey;
-        const Tr: TimeStamp;
+        var Kir: SessionKey;
+        var Tr: TimeStamp;
 
-        send_5(I,R,Mi,{I,Kir,Tr}k(R,S));
-        read_6(R,I,{Mi,Mr}Kir);
+	var Tb: Ticket;
+	const g: Ticket;
+	var h: Ticket;
+
+	read_!chain(R,I, { R,Tr,Kir }k(I,S), Tb);
+
+        send_5(I,R,Mi,{I,Kir,Tr}k(R,S),g);
+        read_6(R,I,{Mi,Mr,g,h}Kir);
         send_7(I,R,{I,Mr}Kir);
+
+        claim_I0(I,Secret, g);
+        claim_I5(I,Secret, h);
         claim_I1(I,Secret, Kir);
         claim_I2(I,Niagree);
         claim_I3(I,Nisynch);
@@ -47,11 +56,17 @@ protocol neustub^Repeat(I,R,S)
         var Tr: TimeStamp;
         var Kir: SessionKey;
         var Mi: Nonce;
+
+	var g: Ticket;
+	const h: Ticket;
         
-        read_5(I,R,Mi,{I,Kir,Tr}k(R,S));
-        send_6(R,I,{Mi,Mr}Kir);
+        read_5(I,R,Mi,{I,Kir,Tr}k(R,S),g);
+        send_6(R,I,{Mi,Mr,g,h}Kir);
         read_7(I,R,{I,Mr}Kir);
+
         claim_R1(R,Secret, Kir);
+        claim_R5(R,Secret, g);
+        claim_R6(R,Secret, h);
         claim_R2(R,Niagree);
         claim_R3(R,Nisynch);
         claim_R4(R,Empty,(Fresh,Kir));