An Overview of Cryptography

Gary C. Kessler9 November 2010(Original version: May 1998)CONTENTS1. INTRODUCTION2. THE PURPOSE OF CRYPTOGRAPHY3. TYPES OF CRYPTOGRAPHIC ALGORITHMS3.1. Secret Key Cryptography 3.2. Public-Key Cryptography3.3. Hash Functions3.4. Why Three Encryption Techniques?3.5. The Significance of Key Length4. TRUST MODELS4.1. PGP Web of Trust4.2. Kerberos4.3. Public Key Certificates and Certification