When it comes to protecting your data, there's a multitude of ways you could likely achieve that - though I imagine lava lamps wasn't your first guess.
As hackers create a variety of methods to access your technological devices - including some very creative ways, let's say -people are having to also find ways to protect their internet information.
An encryption key would be a great start, however, it isn't entirely fool-proof as it all hinges on how easy the code is to get hold of if you're not the intended recipient, because if you have the key then the data is no longer encrypted.