Sumários
Towards signing - Hash functions
22 abril 2019, 15:30 • Paulo Alexandre Carreira Mateus
Hash functions. Weak and strong collision free functions. P=NP vs existence of cryptographic hash functions. Birthday attack. Attacks to currently used cryptographic hash functions.
Towards signing - Hash functions
22 abril 2019, 15:30 • Paulo Alexandre Carreira Mateus
Hash functions. Weak and strong collision free functions. P=NP vs existence of cryptographic hash functions. Birthday attack. Attacks to currently used cryptographic hash functions.
Signature Schemes
11 abril 2019, 13:00 • Paulo Alexandre Carreira Mateus
Signature scheme from a cryptosystem. RSA signatures scheme. DSS and ElGamal signature scheme. Attacks to signing.
Signature Schemes
11 abril 2019, 13:00 • Paulo Alexandre Carreira Mateus
Signature scheme from a cryptosystem. RSA signatures scheme. DSS and ElGamal signature scheme. Attacks to signing.
Attacks to discrete log 2
8 abril 2019, 15:30 • Paulo Alexandre Carreira Mateus
Bit-security of the discrete log: 2nd lsb is in P is equivalent to the DLog problem being in P. Overview of Elliptic Curves. Computing efficiently nP with Double & Add. Discussion on trace-one curves and possible side-channel attacks on the Double & Add. Exercise related to a cryptosystem based on quadratic residues.