Sumários
T5
8 março 2017, 17:00 • Paulo Alexandre Carreira Mateus
AES. Differential and algebraic cryptoanalysis of S-Boxes. Other attacks: side-channel attacks, attacks to key generation. Log cost RAMachine. Cost of operations. Decidable language. Polinomial-time Language and class P.
Aula Tagus - 4
7 março 2017, 15:00 • Filipe Manuel Rodrigues Casal
Iterated cipher. Substitution Permutation Networks. S-Boxes. Motivation for Linear cryptanalysis. Bernoulli r.v. Piling-up lemma. Linear approximations of S-boxes and examples. AES demo.
Aula Tagus - 3
2 março 2017, 13:00 • Filipe Manuel Rodrigues Casal
One-time pad. Sample space and random variable. Uniform random variable. Shannon's Theorem for perfect security. Kerckhoffs's principles. Types of attacks: chosen and known cipher/plaintext attacks. Stream ciphers. Linear Feedback Shift Registers. LFSR known plaintext attack.
T4
2 março 2017, 10:30 • Paulo Alexandre Carreira Mateus
Composition and representation of cryptosystems. Modern cryptosystems. Stream ciphers. Feistel Ciphers and substitution-permutation networks. S-box. Linear cryptoanalysis.
T3
1 março 2017, 17:00 • Paulo Alexandre Carreira Mateus
Invertibility of linear transformations over modules in Z_k. One-time pad. Perfect security. Shannon's theorem.