Am I correct in thinking that asyncio encode and decode are good for security? I can't find any information in the docs or even Google. Does anyone know how they work and if they would be good enough to use in a secure application or should I look to other libraries?
I wasn't familiar with what you're asking about, but it looks like you're referring to
streams. However, encode and decode there aren't part of strings, they're part of normal string operations (it looks like you were confused, reading the docs). As far as that goes, I'm not sure what you mean about security with respect to those two methods. It's just a matter of whether you're treating a bunch of characters as lower-level bytes or a unicode string.
I'm afraid you're asking a question with some goal in mind. It might be helpful to tell us the goal, and we can help you get there, rather than trying to go through things that could potentially be skipped to get to your goal.
If you want to do some encryption on a data go look at
PyNaCl module.