Unformatted text preview: iment of choice for military and serious commercial applications. The NSA, for example, only authorizes encryption in hardware. There are several reasons why this is so. 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)
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:
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----------- Table 10.5 Comparing File-Level and Driver-Level Encryption File-Level Encryption Benefits: Ease of implementation and use. Flexible. Relatively small performance penalty. Users can move files between different machines without problems. Users can back files up without problems. Security Issues: Potential leakage through security-unconscious programs. (Program may write file to disk for temporary storage, for example.) Bad implementations may always re-encrypt with same key for same password. Driver-Level Encryption Temporary files, work files, and so forth can be kept on the secure drive. It’s harder to forget to re-encrypt something on this kind of system. Lots of things can go wrong with a device-driver or memory-resident program. Bad implementations will allow chosen-plaintext, or even chosen-ciphertext attacks. If whole system is master-keyed under one password, loss of that password means that the attacker gets everything. A more limited set of ciphers can reasonably be used for this kind of application. For example, OFB stream ciphers would not work. Usability Problems: User has to figure out what...
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