applied cryptography - protocols, algorithms, and source code in c

This is still considerably more memory storage than

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Unformatted text preview: can be used with any one-way hash function: MD4, MD5, Snefru, and others. It is unpatented. Anyone can use it at any time, in any way, royalty-free [676]. Previous Table of Contents Next Products | Contact Us | About Us | Privacy | Ad Info | Home Use of this site is subject to certain Terms & Conditions, Copyright © 1996-2000 EarthWeb Inc. All rights reserved. Reproduction whole or in part in any form or medium without express written permission of EarthWeb is prohibited. Read EarthWeb's privacy statement. To access the contents, click the chapter and section titles. Applied Cryptography, Second Edition: Protocols, Algorthms, and Source Code in C (cloth) Go! Keyword Brief Full Advanced Search Search Tips (Publisher: John Wiley & Sons, Inc.) Author(s): Bruce Schneier ISBN: 0471128457 Publication Date: 01/01/96 Search this book: Go! Previous Table of Contents Next ----------- However, I donot trust this construction. It is possible to attack the hash function in a way that hash functions are not designed to withstand. It is not important for hash functions to be able to resist a chosen-plaintext attack, where a cryptanalyst chooses several of those starting 160-bit values, has them “encrypted” by the same 512-bit “key,” and uses this to learn some information about the 512-bit key used. Since the designers didnot have to worry about this, it seems like a bad idea to count on your cipher being able to resist this attack. Security of Ciphers Based on one-Way Hash Functions While these constructions can be secure, they depend on the choice of the underlying one-way hash function. A good one-way hash function doesnot necessarily make a secure encryption algorithm. Cryptographic requirements are different. For example, linear cryptanalysis is not a viable attack against one-way hash functions, but works against encryption algorithms. A one-way hash function such as SHA could have linear characteristics which, while not affecting its security as a one-way...
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