| In the context of "Internet+finance",financial data generated by users has important business reference value,so it is necessary to achieve data sharing security and controllability.Block chain technology has the characteristics of decentralization,tamper-proof by distributed the synergy and value data flow of charge to an account,but in the existing data sharing scheme based on block chain there are still a lot of room for improvement,for example,a huge amount of stored data the blocks in the chain of pressure is too large,lead to node authentication inefficient,completely block chain disorderly development of the "no regulation",Become a breeding network illegal criminal activities tool.Combined with the data sharing needs of the financial field and the consideration of the blockchain sharing scheme,this paper studies the blockchain supervisable privacy protection scheme from the three main aspects of distributed storage,secure sharing and supervision for the Know Your Customer(KYC)business in the financial field.The main research contents and innovations of this paper are as follows:(1)In order to solve the problem of secure storage of bank system KYC business data,a distributed storage and internal sharing scheme of bank KYC business data is proposed.This scheme uses Interplanetary File System(IPFS)to centrally store encrypted raw data,avoiding the single point of failure caused by centralized storage.At the same time,the tamper-proof characteristics of blockchain technology are used to record the key process of data,which ensures the integrity and traceability of data,and also solves the complicated and inefficient problem caused by mass data uploading to blockchain in general solutions.In addition,attribute-based encryption is used to control the access to data and ensure the "on-demand disclosure" of user data.Compared with the experimental results,the proposed blockchain has high throughput and transaction processing efficiency,and the cryptographic scheme does not generate additional storage and computing over-head,and has the function characteristics of privacy protection,access control,distributed storage and double data verification,which has high feasibility.(2)According to the requirements of financial business data security sharing and regulatory authorities’ supervision of user sensitive data,a bank KYC business data sharing and supervision scheme is proposed based on blockchain technology.In the sharing scheme,distributed storage scheme and access strategy are adopted,and proxy re-encryption algorithm is adopted to realize ciphertext conversion of encrypted data,thus avoiding privacy disclosure of users in the process of data sharing.In the supervision scheme of sensitive data,multi-receiver encryption technology is adopted to realize the safe sharing and audit supervision of sensitive data through the registration of regulator identity,the establishment of trust relationship,key distribution on the chain,blockchain supervision transaction and data verification algorithms,at the same time,the regulation of transaction information contained in the identity binding random number with regulators to facilitate data reveal that track after the proportional amount.Security analysis shows that attackers cannot tamper with block data through computing power attacks,and privacy protection in integrity,confidentiality,access control and supervision is more perfect.Experiments show that the operation time of relevant cryptography increases linearly with the increase of data volume. |
