def verify(user, password):
 def verify_user(user_name, user_password):
  if ((user_name == user) and (user_password == password)):
   return user_name
  return False
 return verify_user

def verify ( user , password ) : def verify_user ( user_name , user_password ) : if ( ( user_name == user ) and ( user_password == password ) ) : return user_name return False return verify_user
verifies that the signature matches the message .