Moni Naor
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Moni Naor is an Israeli computer scientist, currently a professor at the Weizmann Institute of Science. Naor received his Ph.D. in 1989 at the University of California, Berkeley. His adviser was Manuel Blum.
He works in various fields of computer science, mainly the foundations of cryptography. He is especially notable for creating Visual Cryptography (with Adi Shamir), and suggesting various methods for verifying that users of a computer system are human (leading to the notion of CAPTCHA).