【Author】
Ma, Tianchen; Du, Bowen; Li, Mianhong; Li, Jiangfeng; Shi, Yang; Fan, Hongfei
【Source】IEEE SENSORS JOURNAL
【Abstract】Blockchain-based mobile edge computing (BMEC) solves the problem of limited computing resources of devices in the Internet of Things (IoT). However, there are some security threats in the blockchain environment, among which the attacks against consensus algorithms are particularly serious, such as double-spending attacks and long-range attacks. These attacks target the block proposal or validation process, which compromise the integrity of the BMEC by overwriting the correct block record with the wrong block record. In this article,we propose a scheme to solve the above problem by using the cooperative threshold signature and group management scheme to protect the block validity. The blockchain process of a single node is controlled in a group cooperative way, and each new block is regarded as a valid block only if it has a valid threshold signature for the group to which it belongs. Concretely, the system is initialized by a cooperative distributed key generation protocol, the device management protocol uses a resident node to ensure the security and efficiency of device join and leave, and the signature issuing protocol can tolerate a certain degree of exceptions of nodes within the group. We analyze the resistance ability of the scheme against consensus attacks, prove the security of the scheme, and analyze the computing and communication efficiency. Experimental evaluations on the protocols of the proposed scheme have been conducted on cloud virtual machines and embedded boards, including Raspberry Pi and UP2 Grove, which indicated that the scheme is efficient in practical scenarios.
【Keywords】Blockchains; Security; Protocols; Servers; Sensors; Multi-access edge computing; Scalability; Blockchain; Internet of Things; threshold signature; mobile edge computing (MEC)
【标题】面向基于区块链的移动边缘计算的数据真实性和完整性
【摘要】基于区块链的移动边缘计算（BMEC）解决了物联网（IoT）中设备计算资源有限的问题。但是，区块链环境中存在一些安全威胁，其中针对共识算法的攻击尤为严重，例如双花攻击和远程攻击。这些攻击针对区块提议或验证过程，通过用错误的区块记录覆盖正确的区块记录来破坏 BMEC 的完整性。在本文中，我们提出了一种方案来解决上述问题，通过使用协作门限签名和组管理方案来保护块的有效性。单个节点的区块链过程以组合作的方式控制，每个新块只有在其所属组具有有效的阈值签名时才被视为有效块。具体而言，系统由协同分布式密钥生成协议进行初始化，设备管理协议使用常驻节点来保证设备加入和离开的安全性和效率，签名发布协议可以容忍范围内节点的一定程度的异常。团体。我们分析了方案抵抗共识攻击的能力，证明了方案的安全性，分析了计算和通信效率。在云虚拟机和嵌入式板卡（包括Raspberry Pi和UP2 Grove）上对该方案的协议进行了实验评估，表明该方案在实际场景中是有效的。
【关键词】区块链；安全;协议；服务器；传感器；多接入边缘计算；可扩展性；区块链；物联网;阈值签名；移动边缘计算 (MEC)
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