'Mod 256' presentation slideshows

Introduction to Cryptography

828 views • 66 slides

Data Structures and Algorithms for Information Processing

Data Structures and Algorithms for Information Processing. Lecture 13: Sorting II. Outline. Brief review from last time Radix sorting and indexing Recursive sorting algorithms Quicksort. Sorting Demonstration. http://www.cs.ubc.ca/spider/harrison/Java/sorting-demo.html.

714 views • 54 slides

Data Structures and Algorithms for Information Processing

Data Structures and Algorithms for Information Processing. Lecture 13: Sorting II. Outline. Brief review from last time Radix sorting and indexing Recursive sorting algorithms Quicksort. Sorting Demonstration. http://www.cs.ubc.ca/spider/harrison/Java/sorting-demo.html.

702 views • 54 slides

Chapter 8 Encipherment Using Modern Symmetric-Key Ciphers

Chapter 8 Encipherment Using Modern Symmetric-Key Ciphers. 8-1 USE OF MODERN BLOCK CIPHERS. Symmetric-key encipherment can be done using modern block ciphers. Modes of operation have been devised to encipher text of any size employing either DES or AES. 8-1 Continued.

1.09k views • 46 slides

Cryptography

Cryptography. Lecture 3 Stefan Dziembowski www.dziembowski.net stefan@dziembowski.net. Plan. Encryption of multiple messages. Stream ciphers Block ciphers (an introduction) Some images in this document are take from From Wikipedia, the free encyclopedia. On the previous lecture:.

590 views • 46 slides

Chapter 8 Encipherment Using Modern Symmetric-Key Ciphers

Chapter 8 Encipherment Using Modern Symmetric-Key Ciphers. 8-1 USE OF MODERN BLOCK CIPHERS. Symmetric-key encipherment can be done using modern block ciphers. Modes of operation have been devised to encipher text of any size employing either DES or AES. 8-1 Continued.

497 views • 46 slides

519 views • 39 slides

IEEE 802.11 Security

IEEE 802.11 Security. Specifically WEP, WPA, and WPA2. Brett Boge, Presenter CS 450/650 University of Nevada, Reno. Introduction / History. IEEE 802.11 standard for wireless LAN (802.11-1997) Ratified September 1999 WEP included

310 views • 14 slides

Computer security: intro

Computer security: intro. 6.033 Spring 2007. Security Module (Ch 11). Introduction (section A+D+H) Attaining security is difficult Confidentiality Authentication (section C) Authentication of principals (section B+E) Authorization and Certification (section F+G)

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Computer security: message authentication

Computer security: message authentication. Frans Kaashoek 6.033 Spring 2007. Security goals. Confidentiality Authentication Message User Authorization. RC4 (or ARC4). byte S[256]; procedure RC4_generate() return key-byte { i ? (i + 1) mod 256; j ? (j + S[i]) mod 256;

170 views • 9 slides