trusted systems in cryptography and network security pdf

... 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

Ngày tải lên: 07/12/2013, 11:53

... 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 ... 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 and Practices,...

Ngày tải lên: 18/02/2014, 08:20

... 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 ... 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 ... Receiver PC Eavesdropper Network C = S K (P) C = S -1 K (P) Key: K Fundamentals of Wired and Wireless Networks, Kameswari Chebrolu and Bhaskaran Raman, 09-13 May 2005 Some Popular Systems ● Private key systems: – DES,...

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

... 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

... 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...

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