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Recently, permissioned blockchain has been extensively explored in variousfields, such as asset management, supply chain, healthcare, and many others.Many scholars are dedicated to improving its verifiability, scalability, andperformance based on sharding techniques, including grouping nodes and handlingcross-shard transactions. However, they ignore the node vulnerability problem,i.e., there is no guarantee that nodes will not be maliciously controlledthroughout their life cycle. Facing this challenge, we propose RecAGT, a novelidentification scheme aimed at reducing communication overhead and identifyingpotential malicious nodes. First, shard testable codes are designed to encodethe original data in case of a leak of confidential data. Second, a newidentity proof protocol is presented as evidence against malicious behavior.Finally, adaptive group testing is chosen to identify malicious nodes. Notably,our work focuses on the internal operation within the committee and can thus beapplied to any sharding permissioned blockchains. Simulation results show thatour proposed scheme can effectively identify malicious nodes with lowcommunication and computational costs.

RecAGT: Shard Testable Codes with Adaptive Group Testing for Malicious Nodes Identification in Sharding Permissioned Blockchain