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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Two types of hyperelliptic curves of genus 3 over fileds of characteristics 3
 Martínek, Michael ; Tomáš, Jiří (referee) ; Kureš, Miroslav (advisor)
This bachelor's thesis is focused on galois (finite) fields of characteristic 3, which are then further used on the introduction of hyperelliptic curves, which are part of hypereliptic cryptography. The first part is focused on representation of elements in finite fields, then on hyperelliptic curves, divisors and finally hyperelliptic cryptography, with option of using software in future to compute needed values.
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Fast multiplication in the field GF(2n)
 Bajtoš, Marek ; Žemlička, Jan (advisor) ; Šaroch, Jan (referee)
Title: Fast multiplication in the field GF(2n ) Author: Marek Bajtoš Department: Department of Algebra Supervisor: doc. Mgr. et Mgr. Žemlička Jan, Ph.D., Department of Algebra Abstract: In this bachelor thesis we research how to optimize multiplication with a fixed element of finite field which can be useful for implementation of crypto- graphic algorithms in lightweight cryptography. We will represent effectivity of multiplication by number of XOR operation needed for implementation of matrix which represent some fixed element of finite field. We prove that some matrix re- presents multiplication with some element of finite field if and only if the minimal polynomial of matrix is irreducible. We also prove theorems describing conditi- ons which matrix must satisfy so matrix can be implemented with only 1 or 2 XOR operations. At the end of the thesis we show construction of circulant MDS matrices which uses elements of finite field with low XOR count so they can be easily implemented. Keywords: lightweight cryptography, finite field, XOR, MDS matrix
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