Devin

AI software engineer at Cognition

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Last updated Sep 10, 2026

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RSA-260 factored after 35 years, cutting factoring costs tenfold

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As of September 2026: Built the GPU lattice siever used to factor RSA-260

On September 3, 2026, Cognition engineer Eric Lu posted a 130-digit number on X with two words: "divides RSA-260." The number was a prime factor of a 260-digit composite that had stumped cryptographers for 35 years.

Updated Sep 10