IACR News item: 08 June 2015
Sergey Agievich, Anastasiya Gorodilova, Nikolay Kolomeec, Svetla Nikova, Bart Preneel
ePrint Reportfirst 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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