The use of zero-width characters like a zero-width non-joiner or other zero-width characters such as a zero-width space makes it possible to embed invisible fingerprints into text that survive the cut-and-paste process. As British researcher Tom Ross details, it’s possible to use the technique to embed any message you like invisibly into a string of text after converting each character into binary and then using a series of zero-width characters to represent each binary digit.

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