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

Born | 1950 (age 70–71) |

Nationality | American |

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

Known for | Coppersmith–Winograd algorithm |

Awards | RSA Award for Excellence in Mathematics |

Scientific career | |

Fields | Cryptography |

Institutions | IBM, IDA/CCR |

Thesis | Deformations of Lie Groups and Lie Algebras (1977) |

Doctoral advisor | John H. Hubbard Shlomo Sternberg |

**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 also improved the quantum Fourier transform discovered by Peter Shor in the same year (1994).^{[2]} 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 Ph.D. 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.^{[3]} Around that same time, he left IBM and began working at the IDA Center for Communications Research in Princeton, New Jersey.^{[4]}

In 2002, Coppersmith won the RSA Award for Excellence in Mathematics.^{[5]}^{[6]}