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Security researchers have been warning about a simple technique that cyber criminals and email scammers are using in the wild to bypass most AI-powered phishing detection mechanisms implemented by widely used email services and web security scanners.

Dubbed ZeroFont, the technique involves inserting hidden words with a font size of zero within the actual content of a phishing email, keeping its visual appearance same, but at the same time, making it non-malicious in the eyes of email security scanners.