Earlier quoted context omitted.
It's called a side channel. The amount of information _sent_ really is 1 bit.
> The amount of information _sent_ really is 1 bit. I'm not sure how you're calculating this, but it is obviously wrong. The information conveyed by the contents of a message is the log of the number of possible messages. Here, there is one possible message. The log of one is zero. There's a big difference between one bit of information and zero. You can interpret a "yo" message as conveying one bit of information, a…
If you want to get into the topic of Shannon entropy, then that's another conversation.