Public key exchange - PowerPoint PPT Presentation

Crypto: Some historical and Technical Background April 5, 2001

Crypto: Some historical and Technical Background April 5, 2001. Some Definitions. Plaintext: the unencrypted text Ciphertext: the encrypted message Steganography: hiding message in other message (or even in a picture) one-time pad: a set of keys used at most once

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Security: Focus of Control

Security: Focus of Control. Three approaches for protection against security threats Protection against invalid operations Protection against unauthorized invocations Protection against unauthorized users. Authentication.

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CS363

Week 4 - Wednesday. CS363. Last time. What did we talk about last time? RSA algorithm. Questions?. Project 1. Assignment 2. RSA. Future risks. Public key cryptography would come crashing down if Advances in number theory could make RSA easy to break

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