Fix getEncryption() issue for multiple client.

This is a workaround for [getEncryption() issue #5](https://github.com/hoaproject/Socket/issues/5)

I know is maybe not the best way, but after lot review I don't find how implement that otherwise.
That can be a good beginning for work on best way.

Best Regards.
Haha, over simpification :-p. Use an `if` here. If you don't want, I can do this while fixing the CS at the same time.