6 Chapter 6. Elements of cryptography When implementing security for a CICS Web services solution, it is useful to understand some basic cryptography terminology and concepts such as: What we mean by identification, authentication, authorization, integrity, confidentiality, and non-repudiation The difference between secret key cryptography and public key cryptography The definition of a hashing function, a digital signature, a digital certificate, a certificate authority, and a certificate revocation list The purpose of this chapter is to provide some background information about cryptography to help you when reading the following chapters in this book, in which we explain how cryptographic functions can be used with CICS and describe the scenarios that we tested. © Copyright IBM Corp. 2007. All rights reserved. 151