The latest post on the Google Security blog describes a new upgrade to Gmail's spam filters, which Google calls "one of the biggest defense upgrades in years."
The upgrade comes in the form of a new text classification system called RETVec (Resilient & Efficient Text Vectorizer).
Google says it can help understand “adversarial text manipulation” – these are emails filled with special characters, emojis, typos and other unwanted characters that are readable by humans but not easily understood by machines.
Before, spam emails were full of special characters and easily got past Gmail's defenses.
Although any spam filter could probably find an email with the title “Congratulations! You won $1000” there are emails that are full of “homoglyphic” letters, playing with Unicode standards, and special characters that look like they are part of the regular Latin alphabet, but really aren't.
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