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I mean no offense by this at all, but I wouldn’t because it would indicate a poor understanding of cryptography to me as a user. Either that or being intentionally misleading. In either case, probably unsafe for the user. There does not need to be an extension to encrypt content such that the server never has access to it. It can be encrypted and sent to the host with a key the server never possesses.
And how do you propose the web app provides the code to do that encryption without gaining access to the key?
It doesn’t. The code your site provides is downloaded by your client’s browser. It uses a key on their side that is never sent back to your server. Same as if you did it with an extension or application. This is well trodden ground, and used across the internet such that hosts have zero knowledge of their users’ data aside from in its encrypted state.
Actually, let me give a little ground here. There is a subtle but real benefit to an extension or signed application. With just JavaScript, a server could on a new page load deliver an altered code that would introduce a compromise. If that is the threat you want to mitigate for, you’re onto something. If you’re talking high stakes, and you make it clear this is the threat for which you’re protecting users, then I could be convinced.
The point is you can't prove the server won't serve you code that won't take your key and send it somewhere arbitrary.
Maybe check out WAICT.
Thanks this is very interesting! I also found an extension called WEBCAT that does a similar thing.
Oh yeah. I had just edited to identify that. And if this is the threat for which you’re protecting, this does make sense.