Blockchain-based verifiable key generation method in ma-cpabe

Abstract

This invention discloses a blockchain-based verifiable key generation method in MA-CPABE. The method includes: a data owner running a global setting algorithm to generate system parameters, and electing multiple decentralized attribute authorization nodes through a blockchain staking mechanism; each node generating public and private keys and uploading the public key to the blockchain; the data owner encrypting data based on a policy and publishing the ciphertext and its identifier to the blockchain; when a user requests a key, the attribute authorization node calls an optimized key generation circuit to generate a decryption key and a corresponding zero-knowledge proof, submitting the proof and related data to the blockchain, where a verification node verifies and records the key generation event; for the update history of the zero-knowledge proof, a chain-based evidence storage system is constructed through a smart contract event mechanism to achieve verifiable traceability of its change history. This invention achieves decentralized trusted key management, efficient off-chain computation and verifiability, and significantly reduced blockchain resource consumption.

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