'Strong collision resistance' diaporamas de présentation

Short Introduction to Cryptography

Short Introduction to Cryptography. April 2, 2002 Christopher Boumenot. Purpose of Cryptography. Confidentiality Authentication Integrity Nonrepudiation Access Control Availability. Encryption Basics. Encryption algorithms use two basic principles

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Information Security and Management 11. Message Authentication and Hash Functions

Information Security and Management 11. Message Authentication and Hash Functions. Chih-Hung Wang Sep. 2008. Message Authentication. Authentication Requirement Possible attacks on the network Disclosure Traffic analysis Masquerade Content modification Sequence modification

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David Evans cs.virginia/evans

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Hashing, MACs, RSA

Hashing, MACs, RSA. Sandy Kutin CSPP 532 7/17/01. Rehash: Why do we hash?. Hash functions: boil long message down to a few bits Alice signs hash with public key: Authentication (Bob knows Alice sent it) Non-repudiation (Bob can prove Alice sent it)

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Modern Cryptography Lecture 13

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Chapter 11 Message Authentication and Hash Functions

Chapter 11 Message Authentication and Hash Functions. Message Authentication. message authentication is concerned with: protecting the integrity of a message validating identity of originator non-repudiation of origin (dispute resolution) then three alternative functions used:

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Digital Signatures and Hash Functions

Digital Signatures and Hash Functions . Digital Signatures. Problem. Symmetric-key schemes do not protect the two parties against each other. Since two parties have the same knowledge (namely of keys) so one party can generate a fake message and claims that is from the other party .

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Message Authentication

Message Authentication. message authentication is concerned with: protecting the integrity of a message validating identity of originator non-repudiation of origin (dispute resolution) will consider the security requirements then three alternative functions used: message encryption

302 views • 14 slides