Protocol for preventing Insider Attacks in an Untrusted Environment

The recent advances in utility computing have allowed businesses to move their applications to the cloud, providing features such as auto-scaling and pay-as-you-go facility. Here we are presenting a model for protecting the confidentiality and integrity of client data and computation from insider attacks has been presented. We demonstrate a scenario of how the origin integrity and authenticity of content processed can be verified without revealing the watermark details to the administrator using digital watermarking in an isolated environment. Finally we have tested a prototype system using two different approaches in order to verify that confidentiality and integrity of the client's data is maintained. Verification using ProVerif tool proves that by using a realistic hacker model cryptographic operations and protocol communication cannot be altered. Finally our implementation demonstrates that it adds negligible overhead.