Operational cost of deploying Moving Target Defenses defensive work factors

摘要

Moving Target Defense (MTD) is the concept of controlling change across multiple information system dimensions with the objective of increasing uncertainty and complexity for attackers. Increased uncertainty and complexity will increase the costs of malicious probing and attack efforts and thus prevent or limit network intrusion. As MTD increases complexity of the system for the attacker, the MTD also increases complexity in the desired operation of the system. This introduced complexity results in more difficult network troubleshooting and can cause network degradation or longer network outages. In this research paper the authors describe the defensive work factor concept. Defensive work factors considers in detail the specific impact that the MTD approach has on computing resources and network resources. Measuring impacts on system performance along with identifying how network services (e.g., DHCP, DNS, in-place security mechanisms) are affected by the MTD approach are presented. Also included is a case study of an MTD deployment and the defensive work factor costs. An actual experiment is constructed and metrics are described for the use case.