Kaisa Nyberg

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Kaisa Nyberg is a cryptographer and computer security researcher, currently a professor at Aalto University School of Science. Her notable work includes the theory of perfect nonlinear S-boxes (now known as Nyberg S-boxes), provably secure block cipher design (resulting in KN-Cipher), and the cryptanalysis of the stream ciphers E0 and SNOW.

Nyberg received her Ph.D. in mathematics in 1980 from the University of Helsinki, with a dissertation in topology.[1]


  1. ^ Kaisa Nyberg at the Mathematics Genealogy Project

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