I understand the concept of having a secure centralized network. I'm interested in attempting to learn about such one myself (and perhaps one day contribute or implement one). It just seem like the original comment said that security is totally fine now, which I feel like is incorrect.

For Skype's security model, I thought that before MS bought them they had E2E encryption (sure, it can be MITM'ed, but the conversation's that's not MITM'ed cannot be decoded easily, whereas they could be now).

(Is it fair to say that I verify _some_, not all, of my friends' identity via the way the talk? I feel like if I have E2E encryption, I would be fine as a MITM would have a pretty difficult time faking how some of my friends talk.)