Component based metric for evaluating availability of an information system: an empirical evaluation

摘要

The aim of the paper is to empirically evaluate the quantitative Availability metric derived from the dependencies among the individual measurable components of an information system. The Availability metric is twofold, based on the operating program and the network delay metric of the information system (for the local bound component composition the availability metric is purely based on the software/operating program, for the remote bound component composition the metric incorporates the delay metric of the network). The metric is used for measuring Availability of an information system from the security perspective, the measurements may be done at the system-design level or for a developed system the metric is applied to the individual working components (software/ program code. The system to be evaluated is a network based video monitoring system EES and all the measurements are done using the source code of the system. The steps mentioned in the availability evaluation algorithm are followed in the evaluation process of the system and the final output of the algorithm is the availability score IAV(SyS) for the EES system. The score gives an indication of security of the system with the current design.