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Once popular for attacking AI, ASCII smuggling is embraced by spammers

Summary by Ars Technica
A once-overlooked block of unicode that's invisible to humans is gaining ever wider use.

4 Articles

News from Egypt: Microsoft warned in a new security report of fraudulent mail senders and random mail.

A technique created to hide malicious instructions directed at artificial intelligence models is now used by spammers to dodge mail filters. Microsoft recorded a jump from about 21,000 daily detections to more than 1.3 million, while attackers hide keywords using invisible Unicode characters. *** The ASCII smuggling uses almost invisible Unicode tags for readers, but readable during computer processing. Microsoft noted that detections went up fr…

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Ars Technica broke the news in Cambridge, United States on Friday, September 4, 2026.
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