Improving Hard Disk Contention-Based Covert Channel in Cloud Computing Environment
Steganographic methods allow the covert exchange of secret data between parties aware of the procedure. The cloud computing environment is a new and hot target for steganographers, and currently not many solutions have been proposed. This paper proposes CloudSteg which is a steganographic method that allows the creation of a covert channel based on hard disk contention between the two cloud instances that reside on the same physical machine. Experimental results conducted using open source cloud environment OpenStack; show that CloudSteg is able to achieve a bandwidth of about 0.1 bps which is 1000 times higher than is known from the state-of-the-art version.