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Although 3DES with two keys is possible, always use three independent keys. Copyright © 2003, Cisco Systems, Inc. Encryption 1-1-31 Practice Q1) Q2) 1-1-32 Which four modes can be used with DES? ) A) OBC B) ECB C) AES D) CBC E) CFB F) OFB G) 3DES What is the maximum key strength available with 3DES? 0 Copyright © 2003, Cisco Systems, Inc. AES AES • AES = Advanced Encryption Standard • AES initiative announced in 1997 to find an encryption standard to replace DES • There were rigorous reviews of fifteen original candidates • Final choice: the Rijndael ("Rain Doll") cipher © 2003, Cisco Systems, Inc.

In the last round, the column mixing is omitted. AES vs. 3DES AES was chosen to replace DES and 3DES, as they are either too weak (DES, in terms of key length) or too slow (3DES) to run on modern, efficient hardware. AES is therefore more efficient (much faster, usually by a factor of around 5 compared to DES) on the same hardware, and is more suitable for high-throughput, low latency environments, especially if pure software encryption is used. However, AES is a relatively young algorithm, and, as the golden rule of cryptography states, a more mature algorithm is always more trusted.

Encryption 1-1-37 RC6: A block cipher based on RC5 designed by Rivest, Sidney, and Yin. Its main design goal was to meet the requirement of the AES. 0 Copyright © 2003, Cisco Systems, Inc. RC4 • Stream cipher • A variable key-size with byte-oriented operations • Can be expected to run very quickly in software • Commonly used for secure communications, as in the encryption of traffic to and from secure web sites using the SSL protocol © 2003, Cisco Systems, Inc. All rights reserved. 0—1-1-28 RC4 RC4 is a variable key-size stream cipher with byte-oriented operations.

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Designing VPN Security. Student Guide

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