How to store variables passed to a Ruby class when initializing securely so that they can be accessed by other methods?

I need to know how tosecurely store the parameters passed into a Ruby class when initializing as shown below...

 myclass = MyClass.new(auth_token)

... So that it can be accessed by other methods in the class to perform their actions like this :

myclass.do_something

The parameters that I pass are very sensitive so the security should be the highest priority. How can I achieve this?

via Chebli Mohamed