Lars Knudsen

Lars Knudsen

Lars Ramkilde Knudsen (born February 21, 1962) is a Danish researcher in cryptography, particularly interested in the design and analysis of block ciphers, hash functions and message authentication codes (MACs).

Academic

After some early work in banking, Knudsen enrolled at Aarhus University in 1984 studying mathematics and computer science, gaining an MSc in 1992 and a PhD in 1994. From 1997-2001, he worked at the University of Bergen, Norway. Currently, Knudsen is a professor in the Department of Mathematics at the Technical University of Denmark. His Erdös Number is 3 [ [http://www2.mat.dtu.dk/people/Lars.R.Knudsen/ Lars R. Knudsen ] ] , via his work with noted cryptographers Don Coppersmith and Ivan Damgård. Ivan was Lars' teacher and mentor during his studies at Aarhus University, and according to Lars was a deciding factor in his choice to study differential cryptanalysis [Block Cipher - Analysis, Design and Applications, Ph.D. Thesis, 1994. By Lars Knudsen, ISSN 0105-8517] . His Ph.D. was refereed by Bart Preneel.

Publications

Knudsen has published analyses of a wide variety of cryptographic designs, including the RMAC scheme, the SHA-1 and MD2 hash functions, and at least a dozen block ciphers: DES, DFC, IDEA, ICE, LOKI, MISTY, RC2, RC5, RC6, SC2000, Skipjack, Square and SAFER—it has been hinted that the "SK" in the "SAFER-SK" variant means "Stop Knudsen" after he had found weaknesses in a previous version.

Knudsen has also designed ciphers, including the AES candidates DEAL and Serpent (the latter in conjunction with Ross Anderson and Eli Biham).

He introduced the technique of impossible differential cryptanalysis [ cite paper
author = Lars Knudsen | title = DEAL - A 128-bit Block Cipher | version = Technical report no. 151
publisher = Department of Informatics, University of Bergen, Norway | date = February 21 1998 | url = http://www2.mat.dtu.dk/people/Lars.R.Knudsen/newblock.html | format = PDF/PostScript | accessdate = 2007-02-27 ] and integral cryptanalysis.

References

External links

* [http://www.mat.dtu.dk/people/Lars.R.Knudsen/ Homepage]
* [http://www.informatik.uni-trier.de/~ley/db/indices/a-tree/k/Knudsen:Lars_R=.html Some publications]


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