The scope of the proposed standard is to provide requirements and guidance for methods for generation, change, and verification of card authentication codes using at least 16-byte block ciphers or hash based MACs of equivalent strength, including time based/dynamic methods. The following table of contents expresses the intended direction of the work effort, but would be anticipated to change as the work progresses: Foreword Introduction 1 Scope 2 Normative references 3 Terms and Definitions 4 Basic Principles 5 Generation and Verification of Card Security Code (CSC) 5.1 Introduction 5.2 Algorithm for CSC Annex A (informative) Worked Examples Bibliography