Unformatted text preview: n Center. The user requests a file of all public keys from the Center. If the user passes an identification test using his private key, the Center sends this list to the user’s workstation. The list is encrypted using DES to ensure file integrity. The implementation uses DES to encrypt messages. The system generates a random DES key for file encryption; the user encrypts the file with the DES key and encrypts the DES key with the recipient’s public key. Both the DES-encrypted file and the public-key-encrypted key are sent to the recipient. MEMO makes no provision for lost keys. There is some provision for integrity checking of the messages, using checksums. No authentication is built into the system. The particular public-key implementation used for this system—Diffie-Hellman key exchange over GF(2127)—was proven insecure before the system was implemented (see Section 11.6), although it is easy to modify the system to use larger numbers. MEMO was intended mainly for experimental purposes and was never made operational on the real MITRENET system. 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:
Go! Previous Table of Contents Next
----------- 24.3 ISDN
Bell-Northern Research developed a prototype secure Integrated Services Digital Network (ISDN) telephone terminal [499, 1192, 493, 500]. As a telephone, it was never developed beyond prototype. The resulting p...
View Full Document
- Fall '10
- Cryptography, Bruce Schneier, Applied Cryptography, EarthWeb, Search Search Tips