Heiko Mantel Henning Sudbrock Information-Theoretic Modeling and Analysis of Interrupt-Related Covert Channels. 67-81 2008 Formal Aspects in Security and Trust http://dx.doi.org/10.1007/978-3-642-01465-9_5 conf/ifip1-7/2008 db/conf/ifip1-7/fast2008.html#MantelS08