'Public key distribution' diaporamas de présentation

Security Services in Information Systems

Security Services in Information Systems. Basic Concepts. Machine A. Machine B. Key exchange: Diffie-Hellman protocol. 1. Picks a ? GF(p) at random 2. Computes T A = g a mod p 3. Sends T A 4. Receives T B 5. Computes K A = T B a mod p. 1. Picks b ? GF(p) at random

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Authentication and Secure Communication

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Lecture 4.2: Key Distribution

Lecture 4.2: Key Distribution. CS 436/636/736 Spring 2014 Nitesh Saxena. Fun/Informative Bit: Brain Study to Measure Security Behavior. Read More. Course Administration. HW2 was just due We will start grading soon Give out solution soon. Course Administration. Mid-Term Exam

599 views • 43 slides

Cryptography

371 views • 36 slides

CSCE 815 Network Security Lecture 8

CSCE 815 Network Security Lecture 8. SHA Operation and Kerberos. Resources. Stallings Web Site: http://williamstallings.com/ Network Security Essentials, Second Edition Instructors Resources PowerPoint Slides Henric Johnson Tables and Figures

480 views • 34 slides

Key Management and Diffie-Hellman

INCS 741: Cryptography. Key Management and Diffie-Hellman. Dr. Monther Aldwairi New York Institute of Technology- Amman Campus 12/3/2009. Key Management. public-key encryption helps address key distribution problems two aspects of this: distribution of public keys

462 views • 26 slides

Security for the Optimized Link-State Routing Protocol for Wireless Ad Hoc Networks

Security for the Optimized Link-State Routing Protocol for Wireless Ad Hoc Networks. Stephen Asherson Computer Science MSc Student DNA Lab. Outline. Wireless Ad hoc Networks Wireless Ad hoc Routing Protocols OLSR Routing Protocol Security of Wireless Networks

694 views • 25 slides

Encryption

Encryption. Monica Stoica, smonica@cs.bu.edu. Books and papers used: http://www.sun.com/software/white-papers/wp-security-devsecpolicy/ http://people.cs.uchicago.edu/~cbarnard/pgptalk/digsig.html A method for Obtaining Digital Signatures and Public Key Cryptosystems, ACM. Intro.

372 views • 25 slides

Cryptography

Cryptography. Lecture 23. Diffie -Hellman key exchange. G, q, g. h 1. h 2. x ? ? q h 1 = g x. y ? ? q h 2 = g y. k 2 = (h 1 ) y = g xy. k 1 = (h 2 ) x = g xy. Security?. Eavesdropper sees G, q, g, g x , g y Shared key k is g xy

262 views • 25 slides

Computer Security CS 426

Computer Security CS 426. Review for Final Exam. Basic Concepts. Confidentiality Integrity Availability Authenticity ? Integrity (in communications) Non-repudiation Privacy (general concept, need to defined for different contexts) K-Anonymity ?. Cryptography Basics.

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Key Management

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ElGamal Public Key Cryptography

ElGamal Public Key Cryptography. CS 303 Alg. Number Theory & Cryptography Jeremy Johnson.

159 views • 12 slides

ElGamal Public Key Cryptography

ElGamal Public Key Cryptography. CS 303 Alg. Number Theory & Cryptography Jeremy Johnson.

145 views • 12 slides

Key Management

Key Management. public-key encryption helps address key distribution problems have two aspects of this: distribution of public keys use of public-key encryption to distribute secret keys. Distribution of Public Keys. can be considered as using one of: Public announcement

146 views • 11 slides