Chameleon hash,also called one-way hash with trapdoor,has now become the primary technology for implementing redactable blockchain.To solve the problem of trapdoor abuse of chame-leon hash in redactable blockchain,the epoch-based revocable chameleon hash is proposed,where one epoch refers to a specific time period.This function makes the trapdoor time-sensitive and inva-lid as time changes,so as to realize the purpose of revoking the trapdoor.Also,its security model is defined and specific scheme instants are given.The instants are proven to be secure under standard difficult assumptions.Theoretical analysis and experiments show that compared with the same type of scheme,the proposed one has advantages in security with a small extra cost,showing its practicality.
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