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As tlrobinson says, the problem is that we dont want you to have to trust us. One of our goals is to minimize the amount of trust you have to place in us. Therefore, we want you to be safe if we are forced to try and steal your keys. See my other comment for more info: https://news.ycombinator.com/item?id=6245617

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Gotcha, makes sense. Still, I wonder if there might be a clever solution which exploits the same-domain policy to isolate the decryption activity from the rest of the app. That would considerably reduce the attack surface if it handles collecting the key and then you just postMessage strings back and forth.

As you hint at in the other comment, there are various ways that third-parties could vouch for the code running on the decryption domain.

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