New Design of Redactable Consortium Blockchain Scheme Based on Multi-user Chameleon Hash
Due to the lack of supervision strategies,the inclusion of suspicious or harmful information,and the inability to modify data after being uploaded to the chain,the existing blockchain architecture is likely to become an extrajudicial place for low-cost cybercrime,thus limiting its usability.The redactable blockchain scheme is considered to be an effective way to solve this pro-blem,but how to combine this concept with the advantages of the consortium blockchain is an unresolved technical problem.To this end,in this paper,a new cryptographic scheme is put forward,which extends the concept of chameleon hash functions to multi-user scenarios by introducing the group key,and improves the solution to the problem of centralized modification rights caused by a single user holding the whole trapdoor key.On this basis,a consortium-oriented redactable blockchain scheme is pro-posed,which adopts a two-stage model of request-verification to complete the modification.Under the general model and random oracle model,based on the discrete logarithm assumption,it is proved that the scheme is collision-free and multi-user secure.Sim-ulation experiments and comparative analysis also demonstrate the effectiveness and usability of the scheme.
Redactable blockchainChameleon hashConsortium blockchainMulti-userForking lemmaDiscrete logarithm problem
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