submitted 5 months ago by [email protected] to c/[email protected]

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I was thinking about how hard it is to accurately determine whether a screenshot posted online is real or not. I'm thinking there could be an option in the browser to take a "secure screenshot", which would tag the screenshot with the date, url, and whether the page was modified on your computer. It could then hash both the tag and the image data and automatically upload this hash to some secure server somehow. There would need to be a way to guarantee that only the browser could do this, or at least some way to tell exactly what the source was. I'm not much of a cryptography person, but I would be surprised if it isn't possible to do this. Then, you could check if the screenshot you see is legitimate by seeing if it's hash exists in the list of real hashes.

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[-] [email protected] 2 points 5 months ago

There would need to be a way to guarantee that only the browser could do this, or at least some way to tell exactly what the source was.

I don't think there's a way to do that. Let's say browsers implemented this. I could then just take a copy of Firefox source code and make my own version, which is exactly the same than normal FF except the fancy screenshot tool has been slightly modified to allow editing the page before taking the screenshot.

[-] [email protected] 1 points 5 months ago

yes, it would need some way to prove the exact software it was made in, and I'm not sure that's possible

[-] [email protected] 2 points 5 months ago

It is that's essentially what secure boot does with a TPM. The only problem with that is that the device manufacturer gets to decide what software ur device is allowed to run. That's a very slippery slope leading directly to governments banning software they don't like eg encryption etc.

this post was submitted on 23 Jan 2025

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