> are you asking for end-to-end encryption on every online mode of communication in order to consider it secure?
that's not unreasonable at all
that's not unreasonable at all
More to the point, end to end encryption is necessary (but far from sufficient!) to keep communication secure. If you don't need your communication to be secure, that's fine.
The thing about the modern, networked world, is that you don't have to be the CIA to face a sophisticated, global threat model.
The only way that’s obvious to me is searching locally on your device. This will not be a happy experience for any moderately sized organization.
Especially not if I just want to quickly check my messages from a web browser.
Some data can always be locally stored on the device and searched (maybe anything I've typed myself, or particular forums I search frequently). Some data could be downloadable on demand (if I want to search all of my DMs with a given person, it's reasonable even on a phone to download that entire 5MB chat log locally to do the search).
Another way is to trust an archive/search server temporarily with the decryption; if you trust it right now, you can decrypt your logs on that server, do the search, then wipe it. That's a lot safer than all of those logs sitting around forever for anyone who pops the server at any point in the future.
Another option is an enterprise chat server (e.g. Mattermost), or having some kind of chat log server run by the enterprise which is for searching, but use a hypothetical end to end encrypted Slack for routine communications.
Making this all happen as transparently as possible and as efficiently as possible, with clear user security expectations, is what the "company" level stuff would be.
Allowing different security models for different groups would make sense, as long as you could communicate the security models to users and admins somehow.
e2e for direct user to user makes sense.
I disagree, corporate chats still have plenty of reason to want access to historical user-to-user chats. Ignoring the cynical reasons, institutional memory isn't confined to channel chats.