A Group Signature Scheme for Securing Blockchain-Based Mobile Edge Computing

Blockchain-based mobile edge computing (BMEC) is a promising architecture in the fifth-generation (5G) networks. BMEC solves the problem of limited computing resources of devices in the mobile blockchain environment while ensuring the distributed deployment of computing resources and the traceable of transaction data. However, some consensus-level security threats exist in the mobile blockchain environment, i.e., double-spend attacks, long-range attacks, selfish mining. All of these threats can break the integrity of BMEC, allowing the correct block record to be overwritten with a false one. In this paper, we propose a group signature scheme on blocks of blockchain for addressing such issues. Each new block will be regarded as a valid block if it obtains a valid group aggregate signature of the group which the block creator belongs to. We describe in detail the process of authentication and key changes when nodes join and leave BMEC. We also show the role of our proposed group signature scheme in validating blocks. Lastly, the security analysis is also presented to prove that our proposed group signature scheme is effective.