Restored the ciphertext in OR4 in order to make the spec closer to that in OtwayRees.thy
Restored the ciphertext in OR4 in order to make the spec closer to that in
OtwayRees.thy

MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle