CN106936818A - Data Audit method, client and block chain cloud device based on block chain technology - Google Patents

Abstract

The present invention provides a kind of Data Audit method based on block chain technology, client and block chain cloud device.Methods described includes：File destination is uploaded to block chain high in the clouds；The audit tree of the dynamic generation file destination；According to the audit tree, the validity of the file destination is verified.The present invention can in real time verify the validity of storage file, and verification process consumes less network bandwidth resources.

Description

Data audit method, client and blockchain cloud device based on blockchain technology

technical field

The present invention relates to the field of block chain technology, in particular to a data audit method based on block chain technology, a client and a block chain cloud device.

Background technique

We use blockchain technology as the basis to realize the method of data storage, transmission and certification in a decentralized and distributed structure. In a system that uses blockchain technology for data storage and backup, data auditing is a very important issue. Currently, there are basically two auditing methods. One is auditing by returning data in real time. Obviously, this method consumes a lot of network bandwidth and is not very practical. The second method is to pre-generate a fixed number of check values and publish them to the network for verification. The disadvantage of this method is that each verification will consume a check value. Once the check value is used up, it will no longer be valid. verify.

Contents of the invention

The blockchain technology-based data audit method, client and blockchain cloud device provided by the present invention can verify the validity of stored files in real time, and the verification process consumes less network bandwidth resources.

In the first aspect, the present invention provides a data audit method based on block chain technology, the method is applied to the client, and the method includes:

Upload the target file to the blockchain cloud;

Dynamically generate an audit tree of the target file;

According to the audit tree, the validity of the target file is verified.

Optionally, before uploading the target file to the block chain cloud, the method also includes:

Slicing the target file to generate multiple data blocks;

Each data block is encrypted.

Optionally, the uploading the target file to the block chain cloud includes: saving each encrypted data block on each host node of the block chain cloud.

Optionally, the dynamically generating the audit tree of the target file includes:

Generate a random number for the data blocks stored on each host node in the blockchain;

Merge the generated random number of each data block with the data block to generate a hash value;

Combine the generated hash values sequentially to generate a complete audit tree.

Optionally, according to the audit tree, verifying the validity of the target file includes:

Send the generated random numbers of each data block to the corresponding host nodes;

receiving the hash value sent by each host node;

comparing the received hash value with the hash value of each host node in the audit tree;

Judging whether each data block is valid, when the comparison is consistent, the data block is valid;

The validity of the target file is verified, and when all data blocks are valid, the target file is valid.

In a second aspect, the present invention provides a data audit method based on blockchain technology, the method is applied to the blockchain cloud, and the method includes:

Receive the target file uploaded by the client;

Receive the random number of each data block sent by the client;

Combining the random number with the corresponding data block, calculating the hash value of each host node; sending the hash value of each host node to the client, so that the client verifies the validity of each data block.

In a third aspect, the present invention provides a client, where the client includes:

The upload unit is used to upload the target file to the block chain cloud;

A generating unit, configured to dynamically generate the audit tree of the target file;

The first verification unit is configured to verify the validity of the target file according to the audit tree.

Optionally, the client also includes:

a slicing unit, configured to slice the target file to generate multiple data blocks before the upload unit uploads the target file;

An encryption unit, configured to perform encryption processing on each data block generated by the slicing unit.

Optionally, the upload unit is configured to save each data block encrypted by the encryption unit to each host node on the blockchain cloud.

Optionally, the generating unit includes:

The first generation module is used to generate a random number for the data blocks stored on each host node in the blockchain;

The second generation module is used to combine the random number of each data block generated by the first generation module with the data block to generate a hash value;

The third generation module is used to sequentially combine the hash values generated by the second generation module to generate a complete audit tree.

Optionally, the first verification unit includes:

A sending module, configured to send the generated random numbers of each data block to corresponding host nodes;

A receiving module, configured to receive the hash value sent by each host node;

A first comparison module, configured to compare the received hash value with the hash value of each host node in the audit tree;

The first judging module is used to judge whether each data block is valid, and when the comparison results of the first comparison module are consistent, the data block is valid;

The verification module is used to verify the validity of the target file. When all the data blocks are valid, the target file is valid.

In a fourth aspect, the present invention provides a block chain cloud device, and the block chain cloud device includes:

The first receiving unit is used to receive the target file uploaded by the client;

The second receiving unit is used to receive the random number of each data block sent by the client;

a calculation unit, configured to combine the random number with the corresponding data block, and calculate the hash value of each host node;

The sending unit is configured to send the hash values of the host nodes to the client, so that the client can verify the validity of each data block.

The data audit method based on the block chain technology, the client and the block chain cloud device provided by the embodiment of the present invention generate the audit tree of the target file in real time through the client, and then publish the audit tree to the block chain after specific processing , and then initiate an audit to the host backup node as needed, so that the client and the host can complete the validity verification of the stored files according to the audit tree. Compared with the prior art, the invention can initiate verification of stored files at any time, and the verification process consumes less network bandwidth resources.

Description of drawings

Fig. 1 is the flowchart of the data audit method based on block chain technology of an embodiment of the present invention;

Fig. 2 is the flow chart of another embodiment of the present invention based on the data auditing method of block chain technology;

Fig. 3 is a schematic diagram of an implementation of generating an audit tree in the present invention;

FIG. 4 is a schematic structural diagram of a client terminal according to an embodiment of the present invention;

5 is a schematic structural diagram of a generating unit of a client according to an embodiment of the present invention;

6 is a schematic structural diagram of a first verification unit of a client according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a client terminal according to an embodiment of the present invention;

8 is a schematic structural diagram of a block chain cloud device according to an embodiment of the present invention;

9 is a schematic structural diagram of a block chain cloud device according to an embodiment of the present invention;

FIG. 10 is a schematic structural diagram of a second verification unit of a blockchain cloud device according to an embodiment of the present invention.

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is only some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The present invention provides a data audit method based on block chain technology, the method is applied to the client, as shown in Figure 1, the method includes:

S11. Upload the target file to the blockchain cloud;

S12. Generate an audit tree of the target file;

S13. Verify the validity of the target file according to the audit tree.

The present invention provides a data audit method based on block chain technology, said method is applied to block chain cloud, as shown in Figure 2, said method includes:

S21. Receive the target file uploaded by the client;

S22. Receive the random number of each data block sent by the client;

S23. Merge the random number with the corresponding data block, and calculate the hash value of each host node;

S24. Return the hash value of each host node corresponding to the random number to the client, so that the client verifies the validity of each data block.

In the data audit method based on blockchain technology provided by the embodiment of the present invention, the audit tree of the target file is generated in real time through the client, and then the audit tree is published to the blockchain after specific processing, and then initiated to the host backup node as needed. Audit, so that the client and the host can complete the validity verification of the stored files according to the audit tree. Compared with the prior art, the invention can initiate verification of stored files at any time, and the verification process consumes less network bandwidth resources.

Specifically, the user uploads a file to the blockchain cloud through the client. In order to ensure that the file data stored in the blockchain cloud is not tampered with, the client needs to frequently verify the validity of the file. The specific implementation steps of the data audit method based on block chain technology provided by the present invention are as follows:

Step 1. When the user uploads a file through the client, the system will slice the file into several data blocks, encrypt each data block separately, and then save it to the hard disk space contributed by other users on the Internet. Among them, the user node that contributes hard disk space becomes the host node here.

Step 2: Every time the client wants to verify the file, it generates a random number (i) for each data block (i) stored on the host node (i), and then merges the random number (i) with the data block (i) , to generate a hash value (i), and then merge them in turn to finally generate a complete Merkle tree (audit tree). The implementation description is shown in Figure 3.

Step 3: The client deletes the leaf nodes of the Merkle tree (the layer with hash value 0, hash value 1, hash value 2, and hash value 3) and publishes it to the network, and each host node verifies the client. The verification method is to compare the dynamically calculated root hash value with the root hash value released by the client, and if they are consistent, it means that the client is trusted.

Step 4. When the client verifies the data block (i) to the host node (i), it sends the random number (i) to the host node (i), and then compares the hash value (i) returned by the host node (i). Determine the validity of the data block.

Step 5: When all data blocks are verified to be valid, determine the validity of the entire file.

The embodiment of the present invention also provides a client, as shown in Figure 4, the client includes:

Upload unit 11, for uploading the target file to the block chain cloud;

A generating unit 12, configured to generate an audit tree of the target file;

The first verification unit 13 is configured to verify the validity of the target file according to the audit tree.

Optionally, as shown in Figure 5, the client further includes:

A slicing unit 14, configured to slice the target file to generate a plurality of data blocks before the uploading unit 11 uploads the target file;

The encryption unit 15 is configured to perform encryption processing on each data block generated by the slicing unit.

Optionally, as shown in FIG. 6, the generation unit 12 includes:

The first generation module 121 is used to generate a random number for the data blocks stored on each host node in the block chain;

The second generating module 122 is configured to combine the random numbers of the data blocks generated by the first generating module 121 with the data blocks to generate a hash value;

The third generating module 123 is configured to sequentially combine the hash values generated by the second generating module 122 to generate a complete audit tree.

Optionally, as shown in FIG. 7, the first verification unit 13 includes:

A sending module 131, configured to send the generated random numbers of each data block to corresponding host nodes;

A receiving module 132, configured to receive the hash value sent by each host node;

The first comparison module 133 is configured to compare the hash value received by the receiving module 132 with the hash value of each host node in the audit tree;

The first judging module 134 is configured to judge whether each data block is valid, and when the results compared by the first comparison module 133 are consistent, the data block is valid;

The verification module 135 is configured to verify the validity of the target file. When all data blocks are valid, the target file is valid.

Optionally, as shown in Figure 5, the client further includes:

The issuing unit 16 is configured to, after the generation unit generates the audit tree of the target file, delete the leaf nodes of the audit tree and publish it on the network, so that the blockchain cloud verifies the credibility of the client.

The embodiment of the present invention also provides a block chain cloud device, as shown in Figure 8, the block chain cloud device includes:

The first receiving unit 21 is configured to receive the target file uploaded by the client;

The second receiving unit 22 is configured to receive the random number of each data block sent by the client;

A calculation unit 23, configured to combine the random number with the corresponding data block, and calculate the hash value of each host node;

The sending unit 24 is configured to send the hash values of the host nodes to the client, so that the client can verify the validity of each data block.

Optionally, as shown in Figure 9, the block chain cloud device also includes:

The second verification unit 25 is configured to verify the credibility of the client after the second receiving unit 23 receives the random number of each data block sent by the client.

Optionally, as shown in FIG. 10, the second verification unit 25 includes:

The second comparison module 251 is used to compare the hash value of the audit tree issued by the client with the hash value returned by the host node;

The second judging module 252 is configured to judge whether the client is credible, and when the comparison results of the second comparing module are consistent, it is judged that the client is credible and non-repudiable.

The client and the blockchain cloud device provided by the embodiment of the present invention generate the audit tree of the target file in real time through the client, and then publish the audit tree to the blockchain after specific processing, and then initiate an audit to the host backup node as needed , so that the client and the host complete the validity verification of the stored files according to the audit tree. Compared with the prior art, the invention can initiate verification of stored files at any time, and the verification process consumes less network bandwidth resources.

Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be implemented through computer programs to instruct related hardware, and the programs can be stored in a computer-readable storage medium. During execution, it may include the processes of the embodiments of the above-mentioned methods. Wherein, the storage medium may be a magnetic disk, an optical disk, a read-only memory (Read-Only Memory, ROM) or a random access memory (Random Access Memory, RAM) and the like.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. All should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (12)

1. A data audit method based on blockchain technology, characterized in that, the method is applied to the client, and the method comprises: Upload the target file to the blockchain cloud; Dynamically generate an audit tree of the target file; According to the audit tree, the validity of the target file is verified. 2. The method according to claim 1, wherein, before uploading the target file to the blockchain cloud, the method further comprises: Slicing the target file to generate multiple data blocks; Each data block is encrypted. 3. The method according to claim 2, wherein the uploading the target file to the block chain cloud comprises: saving each encrypted data block on each host node of the block chain cloud. 4. The method according to claim 3, wherein the dynamically generating the audit tree of the target file comprises: Generate a random number for the data blocks stored on each host node in the blockchain; Merge the generated random number of each data block with the data block to generate a hash value; Combine the generated hash values sequentially to generate a complete audit tree. 5. The method according to claim 4, wherein the verification of the validity of the target file comprises: Send the generated random numbers of each data block to the corresponding host nodes; receiving the hash value sent by each host node; comparing the received hash value with the hash value of each host node in the audit tree; Judging whether each data block is valid, when the comparison is consistent, the data block is valid; The validity of the target file is verified, and when all data blocks are valid, the target file is valid. 6. A data audit method based on block chain technology, characterized in that, the method is applied to block chain cloud, and the method comprises: Receive the target file uploaded by the client; Receive the random number of each data block sent by the client; Merge the random number with the corresponding data block, and calculate the hash value of each host node; Send the hash value of each host node to the client, so that the client verifies the validity of each data block. 7. A client, characterized in that the client includes: The upload unit is used to upload the target file to the block chain cloud; A generating unit, configured to dynamically generate the audit tree of the target file; The first verification unit is configured to verify the validity of the target file according to the audit tree. 8. The client according to claim 7, wherein the client further comprises: a slicing unit, configured to slice the target file to generate multiple data blocks before the upload unit uploads the target file; An encryption unit, configured to perform encryption processing on each data block generated by the slicing unit. 9. The client according to claim 8, wherein the upload unit is configured to save each data block encrypted by the encryption unit to each host node on the block chain cloud. 10. The client according to claim 9, wherein the generating unit comprises: The first generation module is used to generate a random number for the data blocks stored on each host node in the blockchain; The second generation module is used to combine the random number of each data block generated by the first generation module with the data block to generate a hash value; The third generation module is used to sequentially combine the hash values generated by the second generation module to generate a complete audit tree. 11. The client according to claim 10, wherein the first verification unit comprises: A sending module, configured to send the generated random numbers of each data block to corresponding host nodes; A receiving module, configured to receive the hash value sent by each host node; A first comparison module, configured to compare the hash value received by the receiving module with the hash value of each host node in the audit tree; The first judging module is used to judge whether each data block is valid, and when the comparison results of the first comparison module are consistent, the data block is valid; The verification module is used to verify the validity of the target file. When all the data blocks are valid, the target file is valid. 12. A block chain cloud device, characterized in that, the block chain cloud device includes: The first receiving unit is used to receive the target file uploaded by the client; The second receiving unit is used to receive the random number of each data block sent by the client; a calculation unit, configured to combine the random number with the corresponding data block, and calculate the hash value of each host node; The sending unit is configured to send the hash values of the host nodes to the client, so that the client can verify the validity of each data block.