摘要：The proliferation of internet users is increasing rapidly as a result of network growth in technology (wired and wireless) in recent years, cloud computing services has gained attention in the scientific and industrial communities. Cloud computing provides a flexible and cost effective services for consumers and companies through offering services, resources and infrastructure for providers. Cloud computing is a sub-domain of computer network so security issues are a challenge for cloud computing spread, there are many security issues and concerns appear while using cloud services. Protecting data from threats and attacks is the most challenging tasks nowadays, since people and companies stores confidential data in the cloud. The purpose of this paper is focus on granting and authenticating data, while these data are transferred over cloud to gain the trust from the provider.
其他关键词：Cloud computing, PIN code, security, mobile computing.
