Unverified60% confidenceFactExact time
CAPTCHA was systematically formalized by Luis von Ahn and others at Carnegie Mellon University around the year 2000.
2
Sources
60%
Confidence
Long-term
Relevance
7/12/2026
First Seen
Sources
反AI字体：人能读懂、机器识别不了的对抗性设计
hackernewshackernews7/11/2026
Related Claims
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