specify proof output level 1 (i.e. no detailed, potentially huge E proofs) to LEO-II; requires version 1.2.9
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