Simplification of definition of synth

--- a/src/HOL/Auth/Message.thy	Mon Sep 23 18:12:45 1996 +0200
+++ b/src/HOL/Auth/Message.thy	Mon Sep 23 18:18:18 1996 +0200
@@ -100,6 +100,6 @@
     Inj     "X: H ==> X: synth H"
     Agent   "Agent agt : synth H"
     MPair   "[| X: synth H;  Y: synth H |] ==> {|X,Y|} : synth H"
-    Crypt   "[| X: synth H; Key(K): synth H |] ==> Crypt X K : synth H"
+    Crypt   "[| X: synth H; Key(K): H |] ==> Crypt X K : synth H"
 
 end