# Don Coppersmith

Don Coppersmith | |
---|---|

Born | c. 1950 |

Nationality | American |

Fields | Cryptography |

Alma mater |
Massachusetts Institute of Technology (B.S., 1972) Harvard University (M.S., 1975; Ph.D., 1977) |

Doctoral advisor |
John H. Hubbard Shlomo Sternberg |

Known for | Coppersmith–Winograd algorithm |

**Don Coppersmith** (born c. 1950) 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.^{[1]} 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 a co-designer of the SEAL and Scream ciphers.

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.^{[1]} 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.^{[2]}

In 2002, Coppersmith won the RSA Security Award for Mathematics.^{[3]}^{[4]}

## References

- 1 2 Coppersmith, Don (May 1994). "The Data Encryption Standard (DES) and its strength against attacks" (PDF).
*IBM Journal of Research and Development*.**38**(3): 243. doi:10.1147/rd.383.0243. - ↑ "Ponder this" IBM.
- ↑ "Don Coppersmith Wins RSA Security Award for Mathematics".
- ↑ "RSA Security Announces 2002 Award Recipients; Awards Recognize Major Contributions in Mathematics, Public Policy and Industry".