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This paper reports on the number field sieve computation of a 768-bit prime field discrete logarithm, describes the different parameter optimizations and resulting algorithmic changes compared to the factorization of a 768-bit RSA modulus, and briefly discusses the cryptologic relevance of the result.
Laura Grigori, Mathieu Jean-Paul Vérité
Jérôme Waser, Julien Aymeric Borrel