trusted system in cryptography and network security ppt

... are explored in Part Four. Cryptography and Network Security Principles and Practices, Fourth Edition 32 / 526 This increase in attacks coincides with an increased use of the Internet and with increases ... range of concerns of network security. [Page 9] Internetwork security is both fascinating and complex. Some of the reasons follow: 1. Security involving communications and networks is not as simple ... Cryptosystem [View full size image] Cryptography and Network Security Principles and Practices, Fourth Edition 37 / 526 ã Table of Contents ã Index Cryptography and Network Security Principles...

Ngày tải lên: 18/02/2014, 08:20

... blocks being independent blocks being independent  main use is sending a few blocks of data main use is sending a few blocks of data Cryptography and Cryptography and Network Security Network ... Cipher Block Chaining (CBC) Cipher Block Chaining (CBC)  message is broken into blocks message is broken into blocks  linked together in encryption operation linked together in encryption ... equivalent in security nb encrypt & decrypt equivalent in security  if if K1=K2 K1=K2 then can work with single DES then can work with single DES  standardized in ANSI X9.17 & ISO8732 standardized...

Ngày tải lên: 06/03/2014, 16:20

... Natural Random Noise Natural Random Noise  best source is natural randomness in real world best source is natural randomness in real world  find a regular but random event and monitor find a ... (PRNGs)” (PRNGs)” Cryptography and Cryptography and Network Security Network Security Chapter 7 Chapter 7 Fourth Edition Fourth Edition by William Stallings by William Stallings Lecture slides ... Random Numbers Random Numbers  many uses of many uses of random numbers random numbers in cryptography in cryptography  nonces in authentication protocols to prevent replay nonces in...

Ngày tải lên: 06/03/2014, 16:20

... secret keys Cryptography and Cryptography and Network Security Network Security Chapter 10 Chapter 10 Fourth Edition Fourth Edition by William Stallings by William Stallings Lecture slides ... significant load in storing and processing keys and messages and processing keys and messages  an alternative is to use elliptic curves an alternative is to use elliptic curves  offers same security ... participants (and value of key depends on the participants (and their private and public key information) their private and public key information)  based on exponentiation in a finite (Galois)...

Ngày tải lên: 15/03/2014, 17:20

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Ngày tải lên: 07/12/2013, 11:53

... plain text into blocks and encrypt each independently ● Properties required: – No bit of plain text should appear directly in cipher text – Changing even one bit in plain text should result in ... key systems: – RSA: based on difficulty of factoring – Galois-Field (GF) system: based on difficulty of finding logarithm – Based on knapsack problem Fundamentals of Wired and Wireless Networks, ... K1 again) Fundamentals of Wired and Wireless Networks, Kameswari Chebrolu and Bhaskaran Raman, 09-13 May 2005 Some Non-Crypto Attacks ● Man -in- the-middle attack: play a trick by being in the...

Ngày tải lên: 05/03/2014, 23:20

... Architecture  ITU-T X.800 Security Architecture for OSI” ITU-T X.800 Security Architecture for OSI”  defines a systematic way of defining and defines a systematic way of defining and providing security requirements providing ... Brown Security Service Security Service  enhance security of data processing systems enhance security of data processing systems and information transfers of an organization and information ... considered: definitions for: definitions for: ã computer, network, internet security computer, network, internet security  X.800 standard X.800 standard  security attacks, services, mechanisms security attacks,...

Ngày tải lên: 06/03/2014, 16:20

... ciphertext select plaintext and obtain ciphertext  chosen ciphertext  select ciphertext and obtain plaintext select ciphertext and obtain plaintext  chosen text  select plaintext or ciphertext ... since the ciphertext provides broken since the ciphertext provides insufficient information to uniquely insufficient information to uniquely determine the corresponding plaintext determine ... encrypted  with 3 cylinders have 26 3 =17576 alphabets Encrypting and Decrypting Encrypting and Decrypting  plaintext is encrypted two letters at a time 1. 1. if a pair is a repeated letter, insert if...

Ngày tải lên: 06/03/2014, 16:20

... numbers  Fermat’s and Euler’s Theorems & Fermat’s and Euler’s Theorems & ø(n) ø(n)  Primality Testing Primality Testing  Chinese Remainder Theorem Chinese Remainder Theorem  Discrete ... in public key and primality testing useful in public key and primality testing Discrete Logarithms Discrete Logarithms  the inverse problem to exponentiation is to find the inverse problem ...  Chinese Remainder theorem lets us work Chinese Remainder theorem lets us work in each moduli m in each moduli m i i separately separately  since computational cost is proportional to since...

Ngày tải lên: 06/03/2014, 16:20

...  Cryptography and Cryptography and Network Security Network Security Chapter 9 Chapter 9 Fourth Edition Fourth Edition by William Stallings by William Stallings Lecture slides ... compute , hence compute ø(n) ø(n) and then d and then d  determine determine ø(n) ø(n) directly and directly and compute compute d d  find d directly find d directly       have ... Public-Key Cryptosystems Public-Key Cryptosystems Summary Summary  & &  principles of public-key cryptography principles of public-key cryptography  RSA...

Ngày tải lên: 06/03/2014, 16:20

... described several methods in 1200s CS595 -Cryptography and Network Security Cryptography and Network Security Xiang-Yang Li CS595 -Cryptography and Network Security Introduction The art of war ... converting plaintext to ciphertext ! Decipher (decode) " The process of converting ciphertext back into plaintext CS595 -Cryptography and Network Security Attack: Interception CS595 -Cryptography ... Security Information Transferring CS595 -Cryptography and Network Security Cryptography ! Cryptography is the study of " Secret (crypto-) writing (-graphy) ! Concerned with developing algorithms:...

Ngày tải lên: 14/03/2014, 20:20

... University in St. Louis Cryptography and Cryptography and Network Security: Overview Network Security: Overview Raj Jain Washington University in Saint Louis Saint Louis, MO 63130 Jain@cse.wustl.edu Audio/Video ... OSI Security Architecture for OSI ” ”   Defines a systematic way of defining and providing Defines a systematic way of defining and providing security requirements security requirements   Provides ... 1-6 â2011 Raj JainCSE571SWashington University in St. Louis Aspects of Security Aspects of Security   Aspects of information security: Aspects of information security:   Security attack Security...

Ngày tải lên: 14/03/2014, 22:20

... disputes  hence include authentication function with hence include authentication function with additional capabilities additional capabilities Cryptography and Cryptography and Network Security Network ... signature in storage be practical save digital signature in storage Denning AS Protocol Denning AS Protocol  Denning 81 presented the following: Denning 81 presented the following: 1. 1. ... are permitted to mingle freely with at least before they are permitted to mingle freely with the inhabitants, certain ceremonies are often performed the inhabitants, certain ceremonies are...

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