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Online Cryptography Course

Dan Boneh

Introduc/on

Course Overview

Dan Boneh

Welcome Course objec/ves: • Learn how crypto primi/ves work • Learn how to use them correctly and reason about security My recommenda/ons: • Take notes • Pause video frequently to think about the material • Answer the in-­‐video ques/ons Dan Boneh

Cryptography is everywhere Secure communica,on: – web traffic:

HTTPS – wireless traffic:

802.11i WPA2 (and WEP),

GSM,

Bluetooth

Encryp,ng files on disk:

EFS, TrueCrypt Content protec,on (e.g. DVD, Blu-­‐ray):

CSS, AACS

User authen,ca,on …

and much much more Dan Boneh

Secure communica/on

no eavesdropping no tampering

Dan Boneh

Secure Sockets Layer / TLS

Two main parts 1. Handshake Protocol:

Establish shared secret key using public-­‐key cryptography

(2nd part of course) 2. Record Layer:

Transmit data using shared secret key Ensure confiden/ality and integrity

(1st part of course) Dan Boneh

Protected files on disk Disk Alice