src/HOL/Auth/All_Symmetric.thy

command 'typedef' now works within a local theory context;

theory All_Symmetric
imports Message
begin

text {* All keys are symmetric *}

defs all_symmetric_def: "all_symmetric \<equiv> True"

lemma isSym_keys: "K \<in> symKeys"
  by (simp add: symKeys_def all_symmetric_def invKey_symmetric) 

end