Mobile cloud computing alleviates the limitations of resource-constrained mobile devices. Mobile cloud computing is gained popularity among mobile users of 998 million in 2014. Mobile Cloud computing is a collection of large group of interconnected networks. This includes personal computers, network servers; mobile computing can be classified in to two types as public and private cloud. Mobile cloud computing describe both a platform and type of application. A cloud computing platform need provisions, configures, reconfigures and depravations servers. The security issues begin to grow and raised there are number of loopholes and challenges that still exist in the security of mobile cloud computing. The security threats have got a hurdle in the rapid adaptability of the mobile computing paradigm. Significant efforts have been committed in research organizations and academia to build secure mobile cloud computing environments and infrastructures. In cloud computing, top cloud services challenges are security, availability and performance. The cloud computing security issue is always the key factor and it is ranked one. This paper presents a survey about the mobile cloud computing security issues and challenges focusing on the cloud computing.