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Don Coppersmith
Cryptographer and mathematician · United States · On the map · Academics · Born 1950 · age 76
Don Coppersmith is a cryptographer and mathematician. He was involved in the design of the Data Encryption Standard block cipher at IBM, particularly the design of the S-boxes, strengthening them against differential cryptanalysis.
Don Coppersmith is read about 20 times a day, in 9 languages.
A typical day, 30 days to 24 August 2026
The middle day of the days counted, so one week of news cannot move it. The line under it is the last 60 days, one point a day.
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He also improved the quantum Fourier transform discovered by Peter Shor in the same year (1994). He has also worked on algorithms for computing discrete logarithms, the cryptanalysis of RSA, methods for rapid matrix multiplication and IBM's MARS cipher. He is also a co-designer of the SEAL and Scream ciphers.
