'Letter frequencies' diaporamas de présentation

Cryptography and Network Security Chapter 2

520 views • 43 slides

Cryptography and Network Security Chapter 2

530 views • 42 slides

Cryptography and Network Security Chapter 2

498 views • 41 slides

Cryptography and Network Security

523 views • 41 slides

Cryptography and Network Security Chapter 2

485 views • 41 slides

Cryptography and Network Security Chapter 2

710 views • 41 slides

552 views • 40 slides

Cryptography and Network Security

495 views • 39 slides

Information Systems Security 3

473 views • 39 slides

Cryptography and Network Security

Cryptography and Network Security. Third Edition by William Stallings Lecture slides by Lawrie Brown. Basic Terminology. plaintext - the original message ciphertext - the coded message cipher - algorithm for transforming plaintext/ciphertext

502 views • 39 slides

551 views • 39 slides

Cryptography and Network Security

475 views • 39 slides

CSCE 715: Network Systems Security

CSCE 715: Network Systems Security. Chin-Tser Huang huangct@cse.sc.edu University of South Carolina. Cryptography. Study of schemes used for encryption Can be characterized by type of encryption operations used substitution / transposition / product number of keys used

488 views • 38 slides

Cryptography and Network Security

400 views • 30 slides

467 views • 30 slides

413 views • 26 slides

COS 433: Cryptography

383 views • 23 slides

Text input

Text input. CMPT 381. Outline. What is important when designing text input? Modeling text Measuring text-entry performance Type-ahead Keyboard layouts Chording keyboards On-screen keyboards. Important factors in text entry. Modeling text. What is this sentence?. Modeling text.

352 views • 20 slides

Cryptology with Spreadsheets

Cryptology with Spreadsheets. A Computer Course for Everyone. Jim Belk Texas A&M University. The Course. MATH 135: The Art of Secret Writing Cornell University, Spring 2005 Humanities students fulfilling a math/computer science requirement. No prerequisites

534 views • 17 slides

Chapter 2 Basic Encryption and Decryption (part B)

Chapter 2 Basic Encryption and Decryption (part B). 2.4 Transpositions (Permutations). P.47 Transposition: an encryption in which the letters of the message are rearranged Also known as permutations Compare the goals: Substitution ? confusion Transposition ? diffusion.

361 views • 17 slides