Don Coppersmith
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Don Coppersmith is a cryptographer and mathematician who was involved in the design of the Data Encryption Standard block cipher at IBM. He has also worked on algorithms for computing discrete logarithms, the cryptanalysis of RSA, methods for rapid matrix multiplication (see Coppersmith-Winograd algorithm) and IBM's MARS cipher. Don is also coauthor of such ciphers as SEAL and Scream.
In 1972, Coppersmith obtained a Bachelor's degree in mathematics at the Massachusetts Institute of Technology, and a Masters and PhD in mathematics from Harvard University in 1975 and 1977 respectively. 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, which has since become quite popular among Math enthusiasts. Following his departure from IBM the column is now run by James Shearer.
Coppersmith is currently employed at the Center for Communications Research in Princeton, a division of the Institute for Defense Analyses.
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