Hardware TOTP tokens with time synchronization

Abstract

Although many users nowadays prefer to use mobile applications for TOTP, there are still use cases for separate/isolated standalone hardware TOTP devices. For various technical restrictions, such as the accuracy limits of oscillators used in realtime clock chips, classic TOTP hardware tokens have a natural tendency to introduce time-drift after some period. This paper describes an innovative product allowing to overcome this disadvantage by introducing a new category of programmable TOTP hardware tokens allowing adjusting the system hardware clock.