Abstract
With the rapid development of Internet of Things(IoT), many security challenges have emerged. In order to have a quantitative evaluation of security defense capability of IoT system, this paper proposes an improved common vulnerability scoring system(CVSS) of IoT, which quantitatively evaluates the defense effectiveness of IoT: higher CVSS score indicates weaker security defense ability of IoT system. In this paper, dynamically-enabled defense technology is applied to enhance the security defense ability of IoT system. The dynamically-enabled defense technology improves the security defense capability of IoT system by changing states randomly. Through comparing the CVSS scores before and after random changes of system status, the paper uses the improved CVSS to analyze the defense effectiveness of IoT system quantitatively.
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