![]() ![]() We classify IIoT technologies into the four-layer security architecture, examine the deployed countermeasure based on CIA+ security requirements, report the deficiencies of today’s countermeasure, and highlight the remaining open issues and challenges. This article presents a comprehensive survey of IIoT security and provides insight into today’s industry countermeasure, current research proposals and ongoing challenges. Whether recent industry countermeasure is still adequate to address the security challenges of IIoT environment are questionable. However, recent studies fail to analyze the gap between security requirements of these technologies and their deployed countermeasure in the industry recently. The studies gave a general overview of IIoT security threats or a detailed analysis that explicitly focuses on specific technologies. ![]() Numerous surveys have been published to review IoT security issues and challenges. The inherent complexities of Industrial Internet of Things (IIoT) architecture make its security and privacy issues becoming critically challenging. ![]()
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