Did you know Signal automatically strips EXIF metadata from every image you send? A quick way to "sanitize" a photo before posting it publicly is to forward the picture to your own "note to self" chat—Signal will strip the metadata and give you a clean copy.
How do you use "note to self"? Share your favorite tricks!
@ilyess @jdw yeah, that's a great tip, if you need to remove exif data unexpectedly and don't have any other tools on hand
If you don't want any compression and want to remove the data directly on your android phone, I like this app: https://github.com/Tommy-Geenexus/exif-eraser (repo contains links to the apk itself and Google Play Store)
@ShadSterling I agree. For more granular EXIF data manipulation needs, a dedicated tool would be a better option.
@me It doesn’t seem like this is happening on the client side, and I don’t see how a server could manipulate encrypted images if they truly fall under E2EE.
I’m pretty sure the image is first uploaded to a Diaspora server, which then strips the EXIF metadata (let me know if I'm wrong!). That means you’d have to trust the Diaspora server. I would recommend avoiding this approach, since there are alternatives that don’t require trusting any particular entity to strip EXIF data.
How did you make this determination? I can't think of an easy way to do that.
@me It was from the PR that @katharsisdrill linked prior to your message. It wasn't on the same thread though, so you might have missed it. Here's the link: https://github.com/diaspora/diaspora/pull/5510
As you can see, EXIF stripping takes place in .rb files which are executed on the server. I would have expected client-side EXIF manipulation-or any other logic for that matter-to be in JS, Webassembly, or another language that can run on the browser-not Ruby. But I could be wrong.
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