Cloud based systems have gained popularity over traditional systems owing to their advantages like cost effectiveness, pay per use, scalability and ease to upgrade. Market is dominated by various cloud vendors providing Infrastructure as a Service (IaaS). However threat to security in mobile IaaS based cloud environment prohibits the usage of services specially, in case of public cloud environment. In this paper we propose secure private cloud architecture for mobile infrastructure as a service. As a prototype service, we deploy a virtual research lab which provides infrastructure and computing resources dynamically in a secure way. The proposed secure private cloud architecture for the lab environment provides the cloud services along with mobility. Mobility gives the researcher the flexibility to access cloud services on their mobile devices anywhere and anytime. We analyse the proposed architecture using a prototype on OpenNebula platform and compare it with traditional computational infrastructure. Results show that our architecture is capable to support 84% more users.