This is why, if you want video conferencing or VoIP, you can't trust the encryption unless you are dead certain that it is end-to-end, and you have control over

This is why, if you want video conferencing or VoIP, you can't trust the encryption unless you are dead certain that it is end-to-end, and you have control over the implementation of the crypto at both ends. Lots of people regard Skype as secure because its connections are encrypted - but Skype is in the middle.