Quiz 2 answers Question I Question 1 Question
- Slides: 37
Quiz 2 answers
Question I •
Question 1 •
Question 2 •
Question 3 •
Question 4 •
Show that encryption from PRG is secure m c m c
m Repeat as many times as the distinguisher wants
Show that PRF construction of encryption is secure
Show that PRF construction of encryption is secure
Show that PRF construction of encryption is secure
MAC forgery game •
Mac example exercise •
Security of macs from PRF via hybrid games
Mac forgery example •
Collision resistance hash function •
Collision-resistant hash function exercises •
Collision-resistant hash function exercises •
Collision-resistant hash function exercises •
Collision-resistant hash function exercises •
Collision-resistant hash function exercises •
Computational assumptions
Types of computational assumptions • Decisional: distinguish between two distributions (or games) • Search: trying to find an element which fulfills certain properties
Discrete logarithm assumption •
Examples of hardness reduction •
Decisional Diffie Hellman problem •
Reduction •
Quadratic Residuosity •
Quadratic Residuosity •
Quadratic Residuosity •
Equivalence for quadratic residuosity problem •
If x is even return 0; If x is odd return 1;
Factoring assumption •
Polynomial recovery •
Learning with errors •
Example of LWE problem •
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