Cache-based Covert Channel

Background

Cache-based Covert Channel 

[1] Cache load measurements create very effective covert channels between cooperating processes running in different VMs. 
In practise, this is not a major threat for current deployments since in most cases the cooperating processes can simply talk to each other over a network. 
However, covert channels become significant when communication is forbidden by information flow control (IFC) mechanisms such as sandboxing and IFC kernels. The latter is a promissing emerging approach to improving security (e.g., web-server functionality). 
[1] explains more on the covert-channel in Section 8.1.

Reference

[1]  Hey, You, Get Off of My Cloud: Exploring Information Leakage in Third-Party Compute Clouds, by Restenpart, T. et al., in CCS09

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