Dan$Boneh$
Introduc/on$
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Online Course: Cryptography by Dan Boneh - Introduction, Key Establishment, Signatures, an, Lecture notes of Network Theory
An introduction to an online cryptography course by Dan Boneh. The course covers various aspects of cryptography, including secret key establishment, digital signatures, anonymous communication, and more. The document also touches upon the importance of confidentiality and integrity in secure communication. Dan Boneh is a well-known computer scientist and cryptography expert.
Typology: Lecture notes
2019/2020
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Introduc/on
What is cryptography?
Online Cryptography Course Dan Boneh
Crypto core
Secret key establishment: Secure communica/on: a?acker??? k k confiden/ality and integrity m 1 m 2 Alice Bob Talking to Alice Talking to Bob
Alice
But crypto can do much more
- Digital signatures
- Anonymous communica/on
- Anonymous digital cash
- Can I spend a “digital coin” without anyone knowing who I am?
- How to prevent double spending? Who was that? Internet
(anon. comm.)
Protocols
- Elec/ons
- Private auc/ons
Crypto magic
- Privately outsourcing computa/on
- Zero knowledge (proof of knowledge) Alice search query What did she search for? results I know the factors of N !! proof π ??? E[ query ] E[ results ] Alice N=p·∙q Bob
N
A rigorous science
The three steps in cryptography:
- Precisely specify threat model
- Propose a construc/on
- Prove that breaking construc/on under threat mode will solve an underlying hard problem