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Lattice based cryptography
Divišová, Jana ; Stanovský, David (advisor) ; Barto, Libor (referee)
The aim of this work is several faces of lattices in cryptography. After the section in which we describe lattices in general and lattice problems, we turn to the lattice based cryptosystems. We describe their mathematical background and also formulations of encryption and decryption algorithms. In the next part we describe the usage of lattice in cryptanalysis. It is mainly attacks against knapsack system a solving hidden number problem. The signi cant part of this work is to compare two cryptosytems RSA a NTRU for the similar level of security. We compare the speed of encryption, decryption and key generation.
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Lattice based cryptography
Divišová, Jana ; Barto, Libor (referee) ; Stanovský, David (advisor)
The aim of this work is several faces of lattices in cryptography. After the section in which we describe lattices in general and lattice problems, we turn to the lattice based cryptosystems. We describe their mathematical background and also formulations of encryption and decryption algorithms. In the next part we describe the usage of lattice in cryptanalysis. It is mainly attacks against knapsack system a solving hidden number problem. The signi cant part of this work is to compare two cryptosytems RSA a NTRU for the similar level of security. We compare the speed of encryption, decryption and key generation.
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Finanční analýza společnosti ČESKÝ TELECOM, a.s.
Divišová, Jana ; Boukal, Petr (advisor) ; Musil, Tomáš (referee)
Cílem diplomové práce je provést finanční analýzu společnosti ČESKÝ TELECOM, a.s., interpretovat zjištěné skutečnosti a pokusit se navrhnout managementu společnosti případná doporučení ke zlepšení finanční situace. Teoretická část je převážně věnována metodice finanční analýzy, která je dále aplikována na vybraný podnik v praktické části této práce. Samotná finanční analýza je doplněna o analýzu telekomunikačního trhu a mezipodnikové srovnání s vybranými konkurenty.
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