CN111506926A

CN111506926A - Private data sharing method based on block chain

Info

Publication number: CN111506926A
Application number: CN202010239239.XA
Authority: CN
Inventors: 王剑; 张辉
Original assignee: Jiangsu Rongzer Information Technology Co Ltd
Current assignee: Jiangsu Rongzer Information Technology Co Ltd
Priority date: 2020-03-30
Filing date: 2020-03-30
Publication date: 2020-08-07
Anticipated expiration: 2040-03-30
Also published as: CN111506926B

Abstract

The invention provides a private data sharing method based on a block chain, which comprises the following steps: private block chain outgoing and block head uplink to a public block chain platform are carried out by adopting a private block chain platform; the private blockchain platform issues a data certificate to a data owner, the data owner shares data to a data requester, and the data requester verifies the data on the public blockchain platform. The invention guarantees the privacy of the data and realizes the sharing of the data.

Description

Private data sharing method based on block chain

Technical Field

The invention belongs to the technical field of block chains, and particularly relates to a private data sharing method based on a block chain.

Background

Under a specific scenario, for example, when two parties of a financial enterprise need to share default of a user and do not want to reveal own user information, data sharing with privacy protection is particularly important.

Disclosure of Invention

The invention aims to provide a private data sharing method based on a block chain, which guarantees the privacy of data and realizes the sharing of the data.

The invention provides the following technical scheme:

a private data sharing method based on a block chain comprises the following steps:

private block chain outgoing and block head uplink to a public block chain platform are carried out by adopting a private block chain platform;

the private blockchain platform issues a data certificate to a data owner, the data owner shares data to a data requester, and the data requester verifies the data on the public blockchain platform.

Preferably, the validation of the data comprises the steps of:

the verifier acquires the transaction root hash on the public block chain platform block, verifies the validity of the transaction private chain block head through the public chain path and the public key corresponding to the private chain, acquires the root hash corresponding to the private transaction from the private chain block head, and verifies the validity of the private transaction through the private chain path.

Preferably, the block header of the private chain includes a previous hash value, a transaction root, and metadata changes, the block body includes specific information of the transaction, the metadata changes include changes of information such as a data category, a queriable keyword set, a data format, and the like, the transaction category in the transaction structure is a data classification condition in the transaction, and the keyword key value pair is a keyword set for third-party querying.

Preferably, the block head of the public link comprises a hash value of a previous block, a transaction root and a private link metadata state, the block body comprises transaction information including a private link block head, the private link block head comprises a hash value of the previous block, and the transaction root and the metadata information change and are used for inquiring and analyzing the private link data and verifying whether the data meets an inquiry condition.

Preferably, the transaction under the block chain-based private data sharing method includes the following steps:

a third party sends a data request to a specific private chain through a platform;

the third party deploys the contract and deposits the amount due into the intelligent contract, and the private link platform deposits the mortgage assets into the contract;

the private chain platform sends the corresponding data and the data certificate to a requester;

and the requester verifies the validity of the information, if the information is valid, the contract sends all the assets to the account of the private link platform, and if the private link platform is malicious, all the assets are sent to the requester.

The invention has the beneficial effects that: the method adopts a private chain and public chain double-layer structure, can add a new private chain at any time, and has high expansibility; the method queries and analyzes data according to the specification through metadata, and the query result can be verified; data is stored in a private chain, a private chain block head is stored in a public chain, calculation is carried out through an intelligent contract, only a data result is returned, and privacy protection is effectively carried out; the data transaction is completed through the contract to avoid disputes, the data cannot be leaked to a third party, the real data is linked up, and the contract compiled by the data requesting party ensures the reality and effectiveness of the result.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic diagram of a private chain plus public chain method of the present invention;

FIG. 2 is a schematic structural diagram of a private chain and public chain platform according to the present invention;

FIG. 3 is a block diagram of the private chain block of the present invention;

FIG. 4 is a block diagram of the male link block of the present invention;

FIG. 5 is a schematic diagram of a trading platform of the present invention;

fig. 6 is a flow chart of the transaction process of the present invention.

Detailed Description

As shown in fig. 1, a private data sharing method based on a block chain includes the following steps:

As shown in fig. 2, the validity verifying step of the data is as follows, the verifier acquires a root hash Mpub of the transaction Tpub on the public link block H, verifies the validity of the transaction Tpub through Ppub and pk, acquires a root hash mppriv corresponding to Tpriv from Tpub, and verifies the validity of the private transaction Tpriv through Ppriv. The method has the advantages of hash chaining by a public chain and private chain mode, and the private data simultaneously utilizes the characteristics of a block chain and achieves a consistent verification mechanism.

As shown in fig. 3, the header of the block of the private chain block includes the previous block hash value, the transaction root Mpriv and the metadata variation, and the block body includes the specific information of the transaction. Metadata changes include changes, such as additions, subtractions or modifications, to information such as data categories, queryable keyword sets, data formats, etc. The transaction category in the transaction structure refers to the data classification condition in the transaction, the keyword key value pair is a keyword set used for third-party query, and the specific data refers to the data of the specific transaction.

As shown in fig. 4, the chunk header of the public link chunk includes the hash value of the previous chunk, the transaction root Mpub, and the private link metadata status, and the chunk body includes the transaction information including the private link chunk header including the hash value of the previous chunk, and the transaction root and metadata information change. The 'private chain + public chain' which can be inquired can know how to inquire the private chain, can know how to analyze private chain data and can verify whether the data meets the inquiry condition.

As shown in fig. 5, in the private data sharing method based on the blockchain, the concept of the trading platform is as follows:

As shown in fig. 6, the specific transaction process:

the method comprises the following steps: the data request direction sends a data request Q to the private chain;

step two: the private chain generates a response data set and a certificate D thereof, encrypts a key K, encrypts the data set, generates MerkLeroot R, and calculates a quotation CD;

step three: the private chain sends Merkle Root R, data set size and quotation CD to the data requester;

step four: the data request party generates a temporary key pair (pri _ key, pub _ key), the data request party starts transaction to the public link contract, initializes and pays, and the private link pays the transaction mortgage Cs to the public link contract;

step five: inquiring Q, a temporary public key pub _ key, verifying size and R by data, and balancing a quotation CD and a transaction collateral Cs;

step six: the private chain sends the encrypted data set to a data requester, and the data requester calculates Merkle Root R 'and the size' of the data set;

step seven: the data requester receives the encrypted data (R ', size') and sends the encrypted data (R ', size') to a public link contract, the public link contract inquires Q, and the data verification size and R, the balance quotation CD and the transaction collateral Cs and the actual data verification R 'and size' are carried out through the temporary public key pub _ key;

step eight: determining R 'is not equal to R, size' is not equal to size, and refunding the deposit Cs, or refunding the fund CD if R 'is not equal to R, and size' is not equal to size; if so, the seller can be confirmed to have received the correct encrypted data;

step nine: the private chain encrypts the key K by using the public key pub _ key of the buyer, sends the encrypted key K to the public chain contract, the public chain contract obtains the encrypted key K, the data requester decrypts the key K by using the pri _ key, and the original response data D is obtained by using the K;

step ten: judging whether the data D is valid, if so, accepting the transaction, completing the transaction, and enabling the public link to contract and transfer the CD + CS to the private link;

step eleven: if data D is invalid, arbitration is proposed: private key pri _ key, Merkle proof of invalid data in the encrypted data set, transaction failure, data error, and public chain contract transfer CD + CS to the data requester.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A private data sharing method based on a block chain is characterized by comprising the following steps:

2. The method for sharing private data based on block chains according to claim 1, wherein the validation of the data comprises the following steps:

3. The method as claimed in claim 1, wherein the blockwise head of the private chain includes a previous hash value, a transaction root, and metadata changes, the blockwise body includes specific information of the transaction, the metadata changes include changes of information such as data category, queryable keyword set, data format, etc., the transaction category in the transaction structure is data classification in the transaction, and the keyword key value pair is a keyword set for third-party query.

4. The method as claimed in claim 1, wherein the public link block header includes hash value of a previous block, transaction root, and private link metadata status, the block body includes transaction information including private link block header, the private link block header includes the previous block hash, and the transaction root and metadata information change are used to query and parse private link data and verify whether the data satisfies query conditions.

5. The blockchain-based private data sharing method according to claim 1, wherein the performing of the transaction under the blockchain-based private data sharing method includes the following steps: