Encryption has been in the news quite a lot lately for obvious reasons. Crypto is good, and we applaud all technology that provides privacy by default. However, we have been growing increasingly concerned that people are coming to think of secret communications as something that can only be done with electronic communication.
Wouldn’t it be great if there were a way to talk that provides some of the benefits of encryption, but doesn’t require anything more than the ability to speak and to hear? Well, there is! There are lots of them. In fact you probably encounter them every day without noticing, because the communication isn’t meant for you.