The Industrial Internet of Things (IIoT), as a special form of Internet of Things (IoT), has great potential in realizing intelligent transformation and industrial resource utilization. However, there are security and privacy concerns about industrial data, which is shared on an open channel via sensor devices. To address these issues, many searchable encryption schemes have been presented to provide both data privacy-protection and data searchability. However, due to the use of expensive pairing operations, most previous schemes were inefficient. Recently, a certificateless searchable public-key encryption (CLSPE) scheme was designed by Lu et al. to remove the pairing operation. Unfortunately, we find that Lu et al.’s scheme is vulnerable to user impersonation attacks. To enhance the security, a new pairing-free dual-server CLSPE (DS-CLSPE) scheme for cloud-based IIoT deployment is designed in this paper. In addition, we provide security and efficiency analysis for DS-CLSPE. The analysis results show that DS-CLSPE can resist chosen keyword attacks (CKA) and has better efficiency than other related schemes.

中文翻译：

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基于云的IIoT的高效免配对免证书可搜索公钥加密

工业物联网（IIoT）作为物联网（IoT）的一种特殊形式，在实现智能化转型和工业资源利用方面具有巨大的潜力。但是，存在关于工业数据的安全性和隐私问题，工业数据通过传感器设备在开放通道上共享。为了解决这些问题，已经提出了许多可搜索的加密方案以提供数据隐私保护和数据可搜索性。但是，由于使用了昂贵的配对操作，大多数先前的方案效率低下。最近，Lu等人设计了一种无证书的可搜索公钥加密（CLSPE）方案。删除配对操作。不幸的是，我们发现Lu等人的方案容易受到用户假冒攻击。为了增强安全性，本文设计了一种新的基于云的IIoT部署的免配对双服务器CLSPE（DS-CLSPE）方案。此外，我们为DS-CLSPE提供安全性和效率分析。分析结果表明，DS-CLSPE可以抵抗选择关键字攻击（CKA），并且比其他相关方案具有更高的效率。