National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Universal Turing machine
Bahýľ, Viktor ; Krajíček, Jan (advisor) ; Holub, Štěpán (referee)
Title: Universal Turing machine Author: Viktor Bahýľ Department: Department of Algebra Supervisor: RNDr. Jan Krajíček, DrSc., Department of Algebra Abstract: This thesis is focused on the processes of solving computational problems. The Turing machine is an example of a model which we can use to solve these problems and these machines are the main objective of this Bachelor thesis. The generality of the model is important; it allows us to simulate any conceivable algorithm. In the theory of Turing machines, the generality is demonstrated by the construction of a universal Turing machine. This is the task of this Thesis: to define a universal Turing machine and to prove its universality. Key definitions, linked with the Turing machines, are recalled at the beginning of the Thesis. The simulation and representation of Turing machines will prove to be the key concepts. We make an extra effort to explain these fundamental notions. The thesis has its own form of representation and defined Turing machine with detailed descriptions for them, together with complete proof of the universality of the mentioned Turing machine. Keywords: Turing, machine, universality, representation
Recovering daily keys for Enigma
Kubániová, Dominika ; Tůma, Jiří (advisor) ; Žemlička, Jan (referee)
During the second world war the ability to read enemy's encrypted messages was important to defence own territory and even to quicken the end of the war. One of the encrypting machines was german Enigma, whose seizing did not yet mean any success of decryption since the number of all possible settings for one day was a number exceeding trillions. In the pre-war and war years the breaking of Enigma was led by the best polish and british mathematicians, while they had to strictly keep their achievements secret, even decades years after the war. The aim of my bachelor thesis is to create a mathematical model of Enigma and to reconstruct its procedures for discovering daily keys with emphasis on their mathematical substantiation. 1

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