'Ed 1 mod' presentation slideshows

Chapter 4: Public Key Cryptography

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NETWORK SECURITY

NETWORK SECURITY. Public-Key Cryptography and Message Authentication. OUTLINE Approaches to Message Authentication Secure Hash Functions and HMAC Public-Key Cryptography Principles Public-Key Cryptography Algorithms Digital Signatures Key Management. What Is Message Authentication.

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Chapter 9 Public-Key Cryptography and RSA

???????. Chapter 9 Public-Key Cryptography and RSA. Key Points. Asymmetric encryption is a form of cryptosystem in which encryption and decryption are performed using the different keystone a public key and one a private key. It is also known as public-key encryption.

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David Evans cs.virginia/~evans

Lecture 8: Non-secret Key Cryptosystems (How Euclid, Fermat and Euler Created E-Commerce). David Evans http://www.cs.virginia.edu/~evans. Real mathematics has no effects on war. No one has yet discovered any warlike purpose to be served by the theory of numbers.

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Network Security--- User Authentication and Key Agreement Protocols. ??? hmsun@cs.nthu.edu.tw Phone: 03-5742968. ??????????? ???????. Outline. Basic Cryptographic Concept Symmetric Encryption Asymmetric Encryption Digital Signature Encrypted Key Exchange (EKE) Conclusions.

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Attacking RSA

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David Evans cs.virginia/evans

Lecture 12: Non-secret Key Cryptosystems (How Euclid, Fermat and Euler Created E-Commerce). David Evans http://www.cs.virginia.edu/evans. Real mathematics has no effects on war. No one has yet discovered any warlike purpose to be served by the theory of numbers.

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CS363

Week 3 - Friday. CS363. Last time. What did we talk about last time? AES Public key cryptography. Questions?. Assignment 1. Project 1. Security Presentation. Matt Shank. Number Theory. Prime.

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CS363

Week 3 - Friday. CS363. Last time. What did we talk about last time? AES Public key cryptography. Questions?. Assignment 1. Project 1. Security Presentation. Matt Shank. Number Theory. Prime.

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CIS 5371 Cryptography

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Foundations of Network and Computer Security

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Digital Signature

Digital Signature. Requirements of Digital Signature. Efficiency Unforgeability : only signer can generate Not reusable : not to use for other message Unalterable : No modification of signed message Authentication of a signer Non-repudiation : not denying the act of signing.

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Key Generation

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Lecture 3.3: Public Key Cryptography III

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# Symmetric Keys = n*(n-1)/2

B. A. C. E. D. # Symmetric Keys = n*(n-1)/2. # Public/Private Keys = 2 n. RSA. Chose two random large prime numbers p & q (of equal length is best) Compute their product n = pq Randomly choose an encryption key e : e and ( (p-1)(q-1)) are relatively prime (gcd=1)

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Public Encryption: RSA

Public Encryption: RSA. Jerzy Wojdy ? o Department of Mathematics Southeast Missouri State University. Symmetric Cryptosystem. A symmetric cryptosystem is a five-tuple ( P , C , K , E , D ), where the following are satisfied: P is a finite set of possible plaintexts .

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Code-Breaking with a Quantum Computer

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Announcements: Questions? This week: Digital signatures, DSA Secret sharing

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