Comment There's no consensus definition of E2E encryption (Score 1) 88
Some people are busting out "definitions" of "End to End Encryption" but people were already using that as in informal descriptive term long before your formalized technical jargon was made up. Nobody should be surprised if there are mismatches. Have faith in our faithlessness.
I personally view the term as an attempt to call semi-bullshit on SMTP and IMAP over SSL/TLS. In the "old" (though not very old) days, if you sent a plaintext email (no PGP!), some people would say "oh, it's encrypted anyway, because the connection is encrypted between your workstation and the SMTP server, the connection from there to some SMTP relay is encrypted, the connection from there to the final SMTP server is encrypted, and the recipient's connection to the IMAP server is encrypted."
To which plenty of people, like me, complained "But it's still plaintext at every stop where it's stored along the way! You should use PGP, because then, regardless of the connection security, or lack of security on all the connections, it is encrypted end to end. Never trust the network, baby!"
Keep in mind that even when I say that, this is without any regard for key security! When I say E2E encrypted, it is implied that the key exchange may have been done poorly/incorrectly, mainly because few people really get to be sure they're not being MitMed when they use PGP. You can exchange keys correctly, but it's enough of a PITA that, in the wild, you rarely get to. You usually just look up their key on some keyserver and hope for the best. Ahem. And I say "usually" as if even that happens often. [eyeroll]
Indeed, every time I hear about some new secure messaging app/protocol, the first thing I wonder is "how do they do key exchange?" and I'm generally mistrusting of it, by default. And sometimes, I'm unpleasantly unsurprised, err I mean, cynically confirmed.
But anyway, if my E2E definition matches yours, great! And if it doesn't, well, that's ok and it's why we descend into the dorky details, so that we can be sure we're both talking about the same thing.