Intro To Cryptography

An Introduction to Cryptography Jon Callas Rest Secured ™ Chief Technology Officer and Chief Security Officer Release Information An Introduction to Cryptography; released October 2006. Copyright Information © 2006 by PGP Corporation. All Rights Reserved. Licensing and Patent Information The IDEA cryptographic cipher described in US patent number 5,214,703 is licensed from Ascom Tech AG. The CAST encryption algorithm is licensed from Northern Telecom, Ltd. PGP Corpor- ation has secured a license to the patent rights contained in the patent application Serial Number 10/655,563 by The Regents of the University of California, entitled Block Cipher Mode of Operation for Constructing a Wide-blocksize block Cipher from a Conventional Block Cipher. PGP Corpora- tion may have patents and/or pending patent applications covering subject matter in this software or its documentation; the furnishing of this software or documentation does not give you any license to these patents. Trademarks PGP, the PGP logo, Pretty Good Privacy, and Pretty Good are all registered trademarks of PGP Corporation. Rest Secured is a trademark of PGP Corporation. All other registered and unregistered trademarks are the sole property of their respective owners. Acknowledgments The compression code in PGP software is by Mark Adler and Jean-Loup Gailly, used with permission from the free Info-ZIP implementation. Limitations The information in this document is subject to change without notice. PGP Corporation does not warrant that the information meets your requirements or that the information is free of errors. The information may include technical inaccuracies or typographical errors. Changes may be made to the information and incorporated in new editions of this document, if and when made available by PGP Corporation. Export Information Export of PGP software may be subject to compliance with the rules and regulations promulgated from time to time by the Bureau of Industry and Security, US Department of Commerce, which restrict the export and re-export of certain products and technical data. About PGP Corporation PGP Corporation, a global security software company, is the leader in email and data encryption. Based on a unified key management and policy infrastructure, the PGP® Encryption Platform offers the broadest set of integrated applications for enterprise data security. The platform enables ii organizations to meet current needs and expand as security requirements evolve for email, laptops, desktops, instant messaging, PDAs, network storage, FTP and bulk data transfers, and backups. PGP solutions are used by more than 30,000 enterprises, businesses, and governments worldwide, including 84 percent of the Fortune® 100 and 66 percent of the Fortune® Global 100, As a res- ult, PGP Corporation has earned a global reputation …