[Resource Topic] 2015/534: Problems, solutions and experience of the first international student's Olympiad in cryptography

Welcome to the resource topic for 2015/534

Title:
Problems, solutions and experience of the first international student’s Olympiad in cryptography

Authors: Sergey Agievich, Anastasiya Gorodilova, Nikolay Kolomeec, Svetla Nikova, Bart Preneel, Vincent Rijmen, George Shushuev, Natalia Tokareva, Valeria Vitkup

Abstract:

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.

ePrint: https://eprint.iacr.org/2015/534

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