Malcolm J. Williamson

Malcolm John Williamson (2 November 1950 – 15 September 2015) was a British mathematician and cryptographer. In 1974 he developed what is now known as Diffie–Hellman key exchange.[4] He was then working at GCHQ and was therefore unable to publicise his research as his work was classified. Martin Hellman, who independently developed the key exchange at the same time, received credit for the discovery until Williamson's research was declassified by the British government in 1997.[4]

Malcolm J. Williamson
Born(1950-11-02)2 November 1950[1]
Stockport, United Kingdom
Died15 September 2015(2015-09-15) (aged 64)[2]
San Diego, United States[3]
Known forIndependently developed a version of Diffie–Hellman key exchange
Scientific career

Williamson studied at Manchester Grammar School, winning first prize in the 1968 British Mathematical Olympiad.[5] He also won a Silver prize[6] at the 1967 International Mathematical Olympiad in Cetinje, Yugoslavia and a Gold prize[7] at the 1968 International Mathematical Olympiad in Moscow.[8] He read mathematics at Trinity College, Cambridge, graduating in 1971. After a year at Liverpool University, he joined GCHQ, and worked there until 1982.

From 1985 to 1989 Williamson worked at Nicolet Instruments in Madison, Wisconsin where he was the primary author on two digital hearing aid patents.[9][10]

See alsoEdit


  1. ^ "In Memory of Malcolm John Williamson". Retrieved 26 June 2016.
  2. ^ "Malcolm John Williamson 1950 - 2015". The San Diego Union Tribune. 18 October 2015. Retrieved 26 June 2016.
  3. ^ "Malcolm John Williamson 1950 - 2015". The San Diego Union Tribune. 18 October 2015. Retrieved 26 June 2016.
  4. ^ a b Singh, Simon (1999). The Code Book. Doubleday. pp. 279–292.
  5. ^ A.Gardiner "The Mathematical Olympiad Handbook" Oxford University Press, 1997
  6. ^ The Science Teacher volume 11 number 1 (October 1967) pages 30 and 31, 1967, retrieved 26 January 2009
  7. ^ New Science Teacher volume 12 number 2 (December 1968) pages 31–35, 1968, retrieved 26 January 2009
  8. ^ Malcolm J. Williamson's results at International Mathematical Olympiad
  9. ^ US Patent 5091952 - Feedback suppression in digital signal processing hearing aids
  10. ^ US Patent 5027410 - Adaptive, programmable signal processing and filtering for hearing aids

External linksEdit

(A couple of typos in this pdf: Extended Euclidean Algorithm modulus should be (p-1) instead of p. Enc and Dec are performed using exponentation; It should have been Ak instead of Ak; similar A(KI) and AI instead of AKI and AI, respectively. )