Spring 2012: CS419 Computer Security MAC, HMAC, Hash functions and DSA

Jan 29, 2013

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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 requirementsthen three alternative functions used:message encryptionmessage authen

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Spring 2012: CS419 Computer Security MAC, HMAC, Hash functions and DSA

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Hash and MAC Functions

Hash and MAC Functions CS427 – Computer Security Hash and MAC Algorithms Hash Functions condense arbitrary size message to fixed size by processing message in blocks through some compression function either custom or block cipher based Message Authentication Code (MAC)

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SHA Hash Functions History & Current State

SHA Hash Functions History & Current State. Helsinki Institute for Information Technology, November 03, 2009. Sergey Panasenko, independent information security consultant, Moscow, Russia. serg@panasenko.ru www.panasenko.ru. SHA Hash Functions. Hash functions cryptanalysis review.

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Cryptographic Hash Functions

CS 361S. Cryptographic Hash Functions. Vitaly Shmatikov. Reading Assignment. Read Kaufman 5.1-2 and 5.6-7. Hash Functions: Main Idea. Hash function H is a lossy compression function Collision: H(x)=H(x’) for some inputs x≠x’ H(x) should look “random”

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CSC 774 Advanced Network Security

CSC 774 Advanced Network Security. Topic 2.2 Hash-Based Primitives. Outline. Absolute basics Encryption/Decryption; Digital signatures; D-H key exchange; Hash functions; Pseudo random functions; traditional key distribution techniques Primitives based on hash functions

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ECE454 /599 Computer and Network Security

ECE454 /599 Computer and Network Security. Dr. Jinyuan (Stella) Sun Dept. of Electrical Engineering and Computer Science University of Tennessee Fall 2012. Hashes and Message Digests. What hashes can do MD2 MD4, MD5, SHA-1 HMAC. Hash Functions.

439 views • 30 slides

Hash Functions

Hash Functions . A hash function takes data of arbitrary size and returns a value in a fixed range. If you compute the hash of the same data at different times, you should get the same answer – if not then the data has been modified. Properties of a hash function.

212 views • 9 slides

Hash Function

Hash Function. Contents. Hash Functions Dedicated Hash Functions Useful for lightweight authentication in RFID system Message Authentication Codes CBC-MAC Nested MAC Collusion Search Attacks. Hash function. {0,1} d. Compress a binary string with an arbitrary

575 views • 35 slides

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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CS 445 / 645 Internet Security Mon & Wed, 11:30 AM ~ 12:45 PM @ SEB 1240 Spring, 2012

School of Computer Science. CS 445 / 645 Internet Security Mon & Wed, 11:30 AM ~ 12:45 PM @ SEB 1240 Spring, 2012. Wednesday, Feb. 22, 2012. Review. Quiz at the end of class. Source sends series of UDP segments to dest First has TTL =1 Second has TTL=2, etc.

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Network and Communication Security

Network and Communication Security. COS 461: Computer Networks Spring 2010 (MW 3:00-4:20 in COS 105) Mike Freedman http://www.cs.princeton.edu/courses/archive/spring10/cos461/. Overview. Network security and definitions Brief introduction to cryptography Cryptographic hash hunctions

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CSCE 715: Network Systems Security

CSCE 715: Network Systems Security. Chin-Tser Huang huangct@cse.sc.edu University of South Carolina. Security of Hash Functions and MAC. Brute-force attacks strong collision resistance hash have cost 2 m / 2 have proposal for hardware MD5 cracker

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Computer Security CS 426 Lecture 6

Computer Security CS 426 Lecture 6. Cryptography: Message Authentication Code. Announcements. Homework 1 handled out on Sept 1, due on Sept 10 Will have first quiz on Sept 8. Limitation of Using Hash Functions for Authentication.

256 views • 15 slides

Hash Functions

Hash Functions. Nathanael Paul Oct. 9, 2002. Hash Functions: Introduction. Cryptographic hash functions Input – any length Output – fixed length H(x) – easy H(x) – one way “hard to invert” H(x) collision free. Purposes for hash functions. Data Integrity Ex: Tripwire Message digest

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HSC: Building Stream Cipher from Secure Hash Functions

HSC: Building Stream Cipher from Secure Hash Functions. Juncao Li Nov. 29 th 2007 Department of Computer Science Portland State University. Agenda. Introduction to the Stream Cipher Security of the Stream Cipher Construction of the Hashing Stream Cipher Analysis of the HSC. Agenda.

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CIT 380: Securing Computer Systems

CIT 380: Securing Computer Systems. Modern Cryptography. Overview. Cryptographic Checksums Hash Functions HMAC Number Theory Review Public Key Cryptography One-Way Trapdoor Functions Diffie-Helman RSA Modern Steganography. Hash Functions. Checksum to verify data integrity.

616 views • 47 slides

Hash and Mac Algorithms

Hash and Mac Algorithms. Contents. Hash Functions Secure Hash Algorithm HMAC. Hash Functions. Hash functions Takes an input message M Produces an output hash value, H( M ), for the message M. M. Hash function. H( M ). Hash Functions. Hash functions

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Cryptographic Hash Functions

Cryptographic Hash Functions. July 2011. Topics. Overview of Cryptography Hash Function Usages Properties Hashing Function Structure Attack on Hash Function The Road to new Secure Hash Standard. Hash Function. The hash value represents concisely the longer message

1.57k views • 50 slides

Computer Security

Computer Security. MIS 604 – IT Solutions to Business Problems Spring 2002 Principles of Computer Security. Topics. Computer Security Goals of Computer Security Principles of Computer Security Security Policy. Computer Security. Definition:

489 views • 16 slides

Applications of SAT Solvers to Cryptanalysis of Hash Functions

Applications of SAT Solvers to Cryptanalysis of Hash Functions. Ilya Mironov Lintao Zhang Microsoft Research Silicon Valley Campus. Overview. Crash course on hash functions Collision-finding attacks (Wang et al. ’05) Automation via SAT solvers. Hash functions. H : {0,1}*→{0,1} n.

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Computer Security

Computer Security. MIS 604 – IT Solutions to Business Problems Spring 2002 Hackers. Topics. Crisis Computer Crimes Hacker Attacks Modes of Computer Security Password Security Network Security Web Security Distributed Systems Security Database Security. Crisis.

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Computer Security

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Hash and MAC Algorithms

Hash and MAC Algorithms. MD5 in detail Overview of SHA and RIPEMD-160 HMAC. Introduction. There is a general structure used practically in all cryptanalytically srtong hash-function fig. 8.10 analogous to the Feistel cipher as a general structure of block-ciphers

363 views • 23 slides

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Spring 2012: CS419 Computer Security MAC, HMAC, Hash functions and DSA

Spring 2012: CS419 Computer Security MAC, HMAC, Hash functions and DSA

Presentation Transcript

Hash and MAC Functions

SHA Hash Functions History &amp; Current State

Cryptographic Hash Functions

CSC 774 Advanced Network Security

ECE454 /599 Computer and Network Security

Hash Functions

Hash Function

NETWORK SECURITY

CS 445 / 645 Internet Security Mon &amp; Wed, 11:30 AM ~ 12:45 PM @ SEB 1240 Spring, 2012

Network and Communication Security

CSCE 715: Network Systems Security

Computer Security CS 426 Lecture 6

Hash Functions

HSC: Building Stream Cipher from Secure Hash Functions

CIT 380: Securing Computer Systems

Hash and Mac Algorithms

Cryptographic Hash Functions

Computer Security

Applications of SAT Solvers to Cryptanalysis of Hash Functions

Computer Security

Computer Security

Hash and MAC Algorithms

SHA Hash Functions History & Current State

CS 445 / 645 Internet Security Mon & Wed, 11:30 AM ~ 12:45 PM @ SEB 1240 Spring, 2012