International Journal of Emerging Trends & Technology in Computer Science (IJETTCS)
Cloud computing presents a delivery model for IT services based on internet and provides a scalable service to easily consumed over the internet on an as-needed basis. A major feature is cloud service is that data processed on clouds are often outsourced, leading to number of issues related to accountability including the handling of personally identifiable information. Dealing with \"Single cloud\" providers is predicted to become less popular with customers due to risks of service availability failure and the possibility of malicious insiders in the single cloud. A movement towards \"Multi-clouds\", or in other words, \"Inter-clouds\" or \"Cloud-of-clouds\" has emerged recently.