Recap unit 2 Review cipher systems, RSA Digital signatures

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Presentation transcript:

Recap unit 2 Review cipher systems, RSA Digital signatures Who uses cryptography? E-commerce Start unit 3 with logic gates

RSA recap What is a cipher system? Is RSA a cipher system? How does RSA work? How is RSA different?

Example Suppose Alice wants to send Bob a message. What will happen if Alice encrypts the message using: Bob’s e Bob’s d Her own e Her own d Digital signature Nonrepudation: Alice can’t deny that she sent the message.

Encryption Today Who uses secret communication today? Just the military and CIA? You can easily encounter it every day Essential part of Web browsers See ecommerce.pdf for details

E-commerce When you buy something online, why do you need encryption? What does an online merchant need in order to sell stuff online? RSA and AES (XOR) Bank authenticates your credit card Certification authority authenticates merchant Https: secure site and padlock icon