Kaisa Nyberg is a Finnish

cryptographer Cryptography, or cryptology (from grc, , translit=kryptós "hidden, secret"; and ''graphein'', "to write", or ''-logia'', "study", respectively), is the practice and study of techniques for secure communication in the presence of adver ...

and

computer security Computer security, cybersecurity (cyber security), or information technology security (IT security) is the protection of computer systems and networks from attack by malicious actors that may result in unauthorized information disclosure, t ...

researcher.

Contributions

Nyberg's research includes the theory of perfect nonlinear

S-boxes In cryptography, an S-box (substitution-box) is a basic component of symmetric key algorithms which performs substitution. In block ciphers, they are typically used to obscure the relationship between the key and the ciphertext, thus ensuring Shan ...

(now known as Nyberg S-boxes),

provably secure Provable security refers to any type or level of computer security that can be proved. It is used in different ways by different fields. Usually, this refers to mathematical proofs, which are common in cryptography. In such a proof, the capabiliti ...

block cipher design (resulting in KN-Cipher, and the cryptanalysis of the stream ciphers E0 and

SNOW Snow comprises individual ice crystals that grow while suspended in the atmosphere—usually within clouds—and then fall, accumulating on the ground where they undergo further changes. It consists of frozen crystalline water throughout ...

Education and career

Nyberg received her Ph.D. in mathematics in 1980 from the

University of Helsinki The University of Helsinki ( fi, Helsingin yliopisto, sv, Helsingfors universitet, abbreviated UH) is a public research university located in Helsinki, Finland since 1829, but founded in the city of Turku (in Swedish ''Åbo'') in 1640 as the ...

. Her dissertation, ''On Subspaces of Products of Nuclear Fréchet Spaces'', was in

topology In mathematics, topology (from the Greek words , and ) is concerned with the properties of a geometric object that are preserved under continuous deformations, such as stretching, twisting, crumpling, and bending; that is, without closing ...

, and was supervised by Edward Leonard Dubinsky. Nyberg began doing cryptography research for the Finnish Defence Forces in 1987, and moved to

Nokia Nokia Corporation (natively Nokia Oyj, referred to as Nokia) is a Finnish multinational telecommunications, information technology, and consumer electronics corporation, established in 1865. Nokia's main headquarters are in Espoo, Finland, i ...

in 1998. She became professor of cryptology at

Aalto University School of Science Aalto University ( fi, Aalto-yliopisto; sv, Aalto-universitetet) is a public research university located in Espoo, Finland. It was established in 2010 as a merger of three major Finnish universities: the Helsinki University of Technology, the He ...

in 2005, and retired as a professor emeritus in 2016.

Selected publications

References

External links

Kaisa Nyberg's page at TKK
* {{DEFAULTSORT:Nyberg, Kaisa Living people Modern cryptographers Computer security academics Finnish mathematicians Women mathematicians 1948 births