Martin Hellman

Martin Hellman
Born	Martin Edward Hellman (1945-10-02) October 2, 1945 New York, United States
Nationality	American
Alma mater	New York University (BSc, 1966) Stanford University (MS, 1967; PhD, 1969)
Known for	Diffie–Hellman key exchange
Awards	IEEE Centennial Medal (1984) EFF Pioneer Award (1994) Louis E. Levy Medal(1997) Golden Jubilee Awards for Technological Innovation (1998) Marconi Prize (2000) National Academy of Engineering Member (2002) Hamming Medal (2010) Computer History Museum Fellow (2011) Turing Award (2015)
Scientific career
Fields	Cryptography Computer science Electrical engineering
Institutions	Stanford University
Thesis	Learning with Finite Memory (1969)
Doctoral advisor	Thomas Cover
Doctoral students	Ralph Merkle Taher Elgamal
Website	ee.stanford.edu/~hellman

Martin Edward Hellman (born October 2, 1945) is an American cryptologist, best known for his invention of public key cryptography in cooperation with Whitfield Diffie and Ralph Merkle. Hellman is a longtime contributor to the computer privacy debate and is more recently known for promoting risk analysis studies on nuclear threats, including the NuclearRisk.org website.

Early life

Hellman graduated from the Bronx High School of Science. He went on to get his Bachelor's degree from New York University in 1966, and at Stanford University he earned a Master's degree in 1967 and a Ph.D. in 1969, all in electrical engineering. From 1968 to 1969 he worked at IBM's Watson Research Center, where he encountered Horst Feistel. From 1969 to 1971 he was an assistant professor at MIT. He joined Stanford in 1971 as a professor, serving until 1996 when he became Professor Emeritus.

Public key cryptography

Hellman and Whitfield Diffie's paper New Directions in Cryptography was published in 1976. It introduced a radically new method of distributing cryptographic keys, which went far toward solving one of the fundamental problems of cryptography, key distribution. It has become known as Diffie–Hellman key exchange. The article also seems to have stimulated the almost immediate public development of a new class of encryption algorithms, the asymmetric key algorithms. Hellman and Diffie were awarded the Marconi Fellowship and accompanying prize in 2000 for work on public-key cryptography and for helping make cryptography a legitimate area of academic research, and they were awarded the 2015 Turing Award for the same work.

Computer privacy debate

Hellman has been a longtime contributor to the computer privacy debate. He and Diffie were the most prominent critics of the short key size of the Data Encryption Standard (DES) in 1975. An audio recording survives of their review of DES at Stanford in 1976 with Dennis Branstad of NBS and representatives of the National Security Agency. Their concern was well-founded: subsequent history has shown not only that NSA actively intervened with IBM and NBS to shorten the key size, but also that the short key size enabled exactly the kind of massively parallel key crackers that Hellman and Diffie sketched out. In response to RSA Security 's DES Challenges starting in 1997, brute force crackers were built which could break DES, making it clear that DES was insecure and obsolete. In 2012, a $10,000 commercially available machine can recover a DES key in days.

Hellman also served (1994–96) on the National Research Council's Committee to Study National Cryptographic Policy, whose main recommendations have since been implemented.

International security

Hellman has been active in researching international security since 1985.

Beyond War

Hellman was involved in the original Beyond War movement, serving as the principal editor for the "BEYOND WAR: A New Way of Thinking" booklet.

Breakthrough

In 1987 more than 30 scholars came together to produce Russian and English editions of the book Breakthrough: Emerging New Thinking, Soviet and Western Scholars Issue a Challenge to Build a World Beyond War. Anatoly Gromyko and Martin Hellman served as the chief editors. The authors of the book examine questions such as: How can we overcome the inexorable forces leading toward a clash between the United States and the Soviet Union? How do we build a common vision for the future? How can we restructure our thinking to synchronize with the imperative of our modern world?

Defusing the nuclear threat

Hellman's current project in international security is to defuse the nuclear threat. In particular, he is studying the probabilities and risks associated with nuclear weapons and encouraging further international research in this area. His website NuclearRisk.org has been endorsed by a number of prominent individuals, including a former Director of the National Security Agency, Stanford's President Emeritus, and two Nobel Laureates.

Hellman is a member of the Board of Directors for Daisy Alliance, a non-governmental organization based in Atlanta, Georgia, seeking global security through nuclear nonproliferation and disarmament.

Awards and honors

In 1997 he was awarded The Franklin Institute's Louis E. Levy Medal, in 1981 the IEEE Donald G. Fink Prize Paper Award (together with Whitfield Diffie), in 1998 a Golden Jubilee Award for Technological Innovation from the IEEE Information Theory Society, and in 2010 the IEEE Richard W. Hamming Medal.

In 2011, he was inducted into the National Inventors Hall of Fame.

Also in 2011, Hellman was made a Fellow of the Computer History Museum for his work, with Whitfield Diffie and Ralph Merkle, on public key cryptography.

Hellman won the Turing Award for 2015 together with Whitfield Diffie. The Turing award is widely considered the most prestigious award in the field of computer science. The citation for the award was: "For fundamental contributions to modern cryptography. Diffie and Hellman's groundbreaking 1976 paper, "New Directions in Cryptography," introduced the ideas of public-key cryptography and digital signatures, which are the foundation for most regularly-used security protocols on the internet today."

External links

• Oral history interview with Martin Hellman Oral history interview 2004, Palo Alto, California. Charles Babbage Institute, University of Minnesota, Minneapolis. Hellman describes his invention of public key cryptography with collaborators Whitfield Diffie and Ralph Merkle at Stanford University in the mid-1970s. He also relates his subsequent work in cryptography with Steve Pohlig (the Pohlig–Hellman algorithm) and others. Hellman addresses the National Security Agency’s (NSA) early efforts to contain and discourage academic work in the field, the Department of Commerce’s encryption export restrictions (under the International Traffic of Arms Regulation, or ITAR), and key escrow (the so-called Clipper chip). He also touches on the commercialization of cryptography with RSA Data Security and VeriSign.
• Martin Hellman's website on the risk of nuclear threat from nuclear war or nuclear terrorism
• "Defusing the nuclear threat and making the world safer" Announcement of Hellman presentation at U.C. Santa Cruz; Oct. 2008
• Hellman at the 2009 RSA conference, video with Hellman participating on the Cryptographer's Panel, April 21, 2009, Moscone Center, San Francisco
• Soaring, Cryptography and Nuclear Weapons on YouTube