ABSTRACT
This chapter describes the demonstration of the one-time password (OTP) authentication method which has been subjected to the GOMS analysis. The goal of the OTP demo is to show the difficulties users are subject to when using this particular method. The verification and validation (V&V) phase of the Multifunction Teller Machine case is undertaken through a demonstrational approach. V&V are supplementary techniques aimed at checking the quality of the system generated. Validation is a quality assurance process of laying down facts that provide a high degree of assurance that a product, service, or system accomplishes its planned requirements. The crucial goal of validation is to make the model useful; it addresses the right problem and provides correct information about the system being modeled. Security systems should be viewed as socio-technical systems that depend on the social context in which they are embedded to function correctly.
