Single access key for activities in smart city

Smart city is a new concept for developing and managing a modern city. It involve the usage of technology, especially information and communication technology, to monitor and understand the condition of a city then to act accordingly. Researches about the architecture of smart city, although the subject is relatively new, has taken the interest of many researcher and big technology company. However, every research mainly focus on the architecture and flow of information in a smart city. The researches left a hole in how the citizen interact and prove their identity in a smart city. This paper over a solution for citizen's identity authentication. The usage of single access key in form of physicalmetrics is proposed. The solution enables a citizen to access multiple services within smart city with a single device or identity.