Unverified50% confidenceEventExact time
The CAPTCHA concept was formally proposed in 2003 by Luis von Ahn and others at Carnegie Mellon University, with its original form being distorted text recognition.
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50%
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Long-term
Relevance
9/7/2026
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Related Claims
UnverifiedCAPTCHA was systematically formalized by Luis von Ahn and others at Carnegie Mellon University around the year 2000.77% similarVerifiedMark Weiser proposed the concept of 'Ubiquitous Computing' in 1991.52% similarUnverified符号接地问题由认知科学家Stevan Harnad在1990年正式提出50% similarUnverifiedawk is a text processing language created in 1977 by Alfred Aho, Peter Weinberger, and Brian Kernighan at Bell Labs, and its name is taken from the initials of the three creators' surnames.50% similar
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