MS Paint and Photos Found to Embed Hidden GUIDs in Locally Saved Images
Microsoft's MS Paint and Photos apps have been found to invisibly embed unique identifiers (GUIDs) as watermarks in image files, even when those images are created or edited entirely offline. The discovery was made through reverse engineering and documented by a researcher at xusheng.dev. The hidden watermarks persist in locally generated output without any visible indication to the user. This raises potential privacy concerns, as the embedded identifiers could theoretically be used to trace images back to a specific installation or device. The finding drew significant attention on Hacker News, accumulating over 270 points and more than 120 comments.
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