This clever tool can help identify leakers who copy and paste your private or sensitive text. The tool relies on so-called "zero-width" characters, invisible characters hidden within words.https://motherboard.vice.com/en_us/article/wj7zpm/zero-width-characters-tool-to-identify-leakers-copy-and-paste-secret-info …
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Replying to @lorenzofb
I think the important thing is that you only need ~10 differences to uniquely identify over a thousand recipients (2^10 = 1024), sure, it could be zwj or bom placement, but also word choice, punctuation, spacing, spelling, list order, number format (e.g. separators), anything.
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Replying to @taviso @lorenzofb
Good thing about zero w chars is that if 2 persons sit next to each other and compare the texts by eye sight, they would see any difference compare to for instance punctuation changes
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Would not*
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Replying to @0xgas @lorenzofb
True, but if two collaborators sat next to each other and did see differences, I don't know if there's a way to produce a third provably untraceable text. That would be an interesting problem. You could write a vague summary, but is that as useful a leak?
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With enough differences you could even use reed solomon encoding to ensure minor edits are tolerated and still identifiable!
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Even with a vague summary, unless it's very high-level, you can't be sure you weren't both in a group being used to bisect recipient groups to find the leakers. It's an interesting computer science problem for both parties.
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