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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•. He was a Putnam Fellow each year from 1968–1971, becoming the first four-time Putnam Fellow in history. In 1998, he started Ponder This, an online monthly column on mathematical puzzles and problems. In October 2005, the column was taken over by James Shearer.
In 2002, Coppersmith won the RSA Security Award for Mathematics.
Coppersmith is currently employed at the Center for Communications Research in Princeton, a division of the Institute for Defense Analyses.
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