View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by AUT Scholarly Commons Currency Security and Forensics: A Survey J. Chambers, W. Yan, A. Garhwal, M. Kankanhalli, e-mail:
[email protected] Abstract—By its definition, the word ‘currency’ refers to an agreed medium for exchange, a nation’s currency is the formal medium enforced by the elected governing entity. Throughout history, issuers have faced one common threat: counterfeiting. Despite technological advancements, overcoming counterfeit production remains a distant future. Scientific determination of authenticity requires a deep understanding of the raw materials and manufacturing processes involved. This survey serves as a synthesis of the current literature to understand the technology and the mechanics involved in currency manufacture and security, whilst identifying gaps in the current literature. Ultimately, a robust currency is desired. Keywords—currency forensics, currency security, banknote recognition, substrate analysis, ink analysis, counterfeit currency I. INTRODUCTION Throughout recorded history, as our society has evolved, we have relied on the ability to exchange goods and services with one another. The earliest known medium of exchange was the barter system, although this system still exists, ‘bartering’ has largely been superseded by formal mediums such as coins, banknotes, and more recently, electronic currency. Traditionally, formal mediums of exchange, or ‘currency’ represents an agreed medium both enforced and controlled by the state, today consisting of uniform items holding value. The value held in currency exists purely by the faith entrusted in authenticity, a common challenge currency issuers have faced is securing the design against counterfeits. In many nations, government owned central banks officially known as “reserve banks” manage the nation’s entire monetary policy.