International Association for Cryptologic Research

International Association
for Cryptologic Research

IACR News item: 08 June 2015

Sergey Agievich, Anastasiya Gorodilova, Nikolay Kolomeec, Svetla Nikova, Bart Preneel
ePrint Report ePrint Report
A detailed overview of the problems, solutions and experience of the

first international student\'s Olympiad in cryptography,

NSUCRYPTO\'2014, is given. We start with rules of participation and

description of rounds. All 15 problems of the Olympiad and their

solutions are considered in detail. There are discussed solutions of

the mathematical problems related to cipher constructing such as

studying of differential characteristics of S-boxes, S-box masking,

determining of relations between cyclic rotation and additions

modulo $2$ and $2^n$, constructing of special linear subspaces in

$\\mathbb{F}_2^n$; problems about the number of solutions of the

equation $F(x)+F(x+a)=b$ over the finite field $\\mathbb{F}_{2^n}$

and APN functions. Some unsolved problems in symmetric cryptography

are also considered.

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