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

Beneath the ipra root are policy certification

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Unformatted text preview: or any key management functions. The Commercial Data Masking Facility (CDMF) provides an exportable version of CCA. It has a special feature that reduces DES keys to an effective 40 bits for export (see Section 15.5) [785]. 24.9 ISO Authentication Framework Public-key cryptography has been recommended for use with the ISO authentication framework, also known as the X.509 protocols [304]. This framework provides for authentication across networks. Although no particular algorithms are specified for either security or authentication, the specification recommends RSA. There are provisions, however, for multiple algorithms and hash functions. X.509 was initially issued in 1988. After public review and comment, it was revised in 1993 to correct some security problems [1100, 750]. Figure 24.2 An X.509 certificate. 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 ----------- Certificates The most important part of X.509 is its structure for public-key certificates. Each user has a distinct name. A trusted Certification Authority (CA) assigns a unique name to each user and issues a signed certificate containing the name and the user’s public key. Figure 24.2 shows an X.509 certificate [304]. The version field identifies the certificate format. The serial number is unique within the CA. The next field identifies the algorithm used to sign the certificate, together with any necessary parameters. Issuer is the name of the CA. The period of validity is a pair of dates; the certificate is valid during the time period between the two. Subject is the name of the user....
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