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Computer and Information Security Handbook, 3rd Edition
book

Computer and Information Security Handbook, 3rd Edition

by John R. Vacca
May 2017
Intermediate to advanced
1280 pages
94h 8m
English
Morgan Kaufmann
Content preview from Computer and Information Security Handbook, 3rd Edition

7. Use of Modern Block Ciphers

DES and AES are designed to encrypt and decrypt data blocks of fixed size. Most practical examples have data blocks of fewer than 64 bits or greater than 128 bits, and to address this issue five different modes of operation have been set up. These five modes of operation are known as the Electronic Code Book, Cipher-Block Chaining, Output Feedback, Cipher Feedback, and Counter modes.

The Electronic Code Book

In this mode, the message is split into blocks, and the blocks are sequentially encrypted. This mode is vulnerable to attack using frequency analysis, the same sort used in simple substitution. Identical blocks would get encrypted to the same blocks, thus exposing the key [1].

Cipher-Block Chaining

A logical operation ...
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Publisher Resources

ISBN: 9780128039298