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Smart home appliances like smart door, smart AC, smart lights etc., are the facilities which can be utilized because of advancements in Internet of Things. However, security of these smart home appliances is very much important to avoid security threats. Existing smart home appliances are facing problems with security issues such as such as hacking, mishandling of devices etc., due to one stage authentication process. The proposed Secured Smart Mobile App for Smart Home Environment (SSMASHE) provides a two stage authentication process which can secure smart home appliances. It consists of three modules, first one is smart things, next one smart mobile app and the third module is big data platform. In this paper a smart home environment embedding with smart mobile app has been simulated to evaluate the security mechanism through authentication process. In this process the delay has been calculated for the purpose of fast communication and security assigned to big data environment. The proposed method delay time is less when compared to Fast Identity Online (FIDO) method. The proposed method is comfortable to real time heterogeneous smart home IoT devices because this process follows the asynchronous authentication procedure.