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

2 trent publishes the master list of all public keys

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Unformatted text preview: — Verifiability. From a proxy signature, a verifier can be convinced of the original signer’s agreement on the signed message. — Identifiability. An original signer can determine the proxy signer’s identity from a proxy signature. — Undeniability. A proxy signer cannot disavow an accepted proxy signature he created. In some cases, a stronger form of identifiability is required—that anyone can determine the proxy signer’s identity from the proxy signature. Proxy signature schemes, based on different digital signature schemes, are in [1001]. 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 ----------- 4.6 Group Signatures David Chaum introduces this problem in [330]: A company has several computers, each connected to the local network. Each department of that company has its own printer (also connected to the network) and only persons of that department are allowed to use their department’s printer. Before printing, therefore, the printer must be convinced that the user is working in that department. At the same time, the company wants privacy; the user’s name may not be revealed. If, however, someone discovers at the end of the day that a printer has been used too often, the director must be able to discover who misused that printer, and send him a bill. The solution to this problem is called a group signature. Group s...
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