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Security is one of the most relevant concerns in cloud computing. With theevolution of cyber-security threats, developing innovative techniques to thwartattacks is of utmost importance. One recent method to improve cloud computingsecurity is Moving Target Defense (MTD). MTD makes use of dynamicreconfiguration in virtualized environments to "confuse" attackers or tonullify their knowledge about the system state. However, there is still noconsolidated mechanism to evaluate the trade-offs between availability andsecurity when using MTD on cloud computing. The evaluation through measurementsis complex as one needs to deal with unexpected events as failures and attacks.To overcome this challenge, we intend to propose a set of models to evaluatethe availability and security of MTD in cloud computing environments. Theexpected results include the quantification of availability and security levelsunder different conditions (e.g., different software aging rates, varyingworkloads, different attack intensities).

Towards Models for Availability and Security Evaluation of Cloud Computing with Moving Target Defense