Abstract: The privacy protection method for users financial data publishing utilizes the characteristics of multi-party maintenance in the consortium chain,and adopts a combination of on-chain and off-chain to reduce storage costs.The access policy is customized by the user, and the attribute-based encryption technology is used to achieve access control for user classification and hierarchy.This paper proposes a user classification and hierarchical access control model based on attribute based encryption.The model combines on-chain and off-chain forms,utilizes attribute-based access control model,adopts ciphertext policy attribute-based  encryption,embeds reputation incentive mechanism into smart contracts,automatically modifies trust scores based on user upload and query operations,and establishes the classifications and hierarchies of  data requesters based on their trust scores,thereby,different levels of users have different access permissions to data,ensuring both data security and flexibility when accessing data.
Key words:attribute-based encryption;blockchain;access control;classification and hierarchical