With the advent of the Industry 4.0 era, the development of smart cities based on the Internet of Things (IoT) has reached a new level. As a key component of the Internet of Things (IoT), the security of wireless sensor networks (WSN) has received widespread attention. Among them, Energy Internet, as an important part to support the construction of smart cities, its security and reliability research is becoming more and more important. In the Energy Internet, distributed energy transaction model is a promising approach to replace the traditional centralized transaction model and has become the leading direction of development in energy trading. As the underlying support, blockchain technology is attracting more and more attention due to its advantages, i.e., integrity and non-repudiation. However, most blockchain-based trading models face the problem of privacy disclosure. In this paper, to solve this problem, Ciphertext-Policy Attribute-Based Encryption (CP-ABE) is introduced as the core algorithm to reconstruct the transaction model. Specifically, we build a general model for distributed transactions called PP-BCETS (Privacy-preserving Blockchain Energy Trading Scheme). It can achieve fine-grained access control through transaction arbitration in the ciphertext form. This design can maximize the protection of privacy information, and considerably improve the security and reliability of the transaction model. Additionally, a credibility-based equity proof consensus mechanism is proposed in PP-BCETS, which can greatly increase the operation efficiency. The security analysis and experimental evaluations are conducted to prove the validity and practicability of our proposed scheme.

随着工业4.0时代的到来，基于物联网（IoT）的智慧城市的发展达到了一个新的水平。作为物联网（IoT）的关键组件，无线传感器网络（WSN）的安全性已受到广泛关注。其中，能源互联网作为支持智慧城市建设的重要组成部分，其安全性和可靠性研究变得越来越重要。在能源互联网中，分布式能源交易模型是一种替代传统的集中交易模型的有前途的方法，已成为能源交易发展的主导方向。作为基础支持，区块链技术由于其优势，即完整性和不可否认性而吸引了越来越多的关注。然而，大多数基于区块链的交易模型都面临着隐私披露的问题。为了解决这个问题，本文引入了基于密文策略的基于属性的加密算法（CP-ABE），作为重建交易模型的核心算法。具体来说，我们为分布式交易建立了一个通用模型，称为PP-BCETS（隐私保护区块链能源交易计划）。它可以通过密文形式的事务仲裁来实现细粒度的访问控制。这种设计可以最大程度地保护隐私信息，并大大提高交易模型的安全性和可靠性。另外，在PP-BCETS中提出了基于信誉的权益证明共识机制，可以大大提高运营效率。