CN112905657B - Block chain data processing method and system capable of protecting user privacy - Google Patents
Block chain data processing method and system capable of protecting user privacy Download PDFInfo
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- G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
- G06F16/24—Querying
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- G06F16/2465—Query processing support for facilitating data mining operations in structured databases
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
- G06F16/27—Replication, distribution or synchronisation of data between databases or within a distributed database system; Distributed database system architectures therefor
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- G—PHYSICS
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- G06Q20/00—Payment architectures, schemes or protocols
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
The invention provides a block chain data processing method and a system thereof capable of protecting user privacy, comprising the following steps: initializing a block chain; the data uploaded by the user is recorded in a storage module of the intelligent contract module; the data processing module hides the label information of the data; the data processing module carries out bit-by-bit precision reduction on the digital non-tag information from one bit, and selects common description preset in the data processing module to carry out data re-description on the non-digital non-tag information; and releasing the data after the modification. The invention also provides a block chain. The data processing module is integrated in the intelligent contract module, the data transformation process is realized in the intelligent contract, a third-party module is not involved, and the security and the confidentiality of the privacy of the user are greatly improved.
Description
Technical Field
The invention relates to a block chain data processing method and a block chain data processing system capable of protecting user privacy.
Background
The block chain creates a novel calculation paradigm and a cooperation mode for establishing trust at low cost in an untrusted competition environment, and through supervision and trust progressive transmission are realized by virtue of a unique trust establishment mechanism. The block chain is derived from encrypted digital currency, is extending to the vertical field at present, has huge innovation potential, is expected to become an important component of digital economic information infrastructure, and is changing the development views of various industries.
The essence of the blockchain is a decentralized distributed database, each party involved in blockchain maintenance is regarded as an independent node, each node has a copy of all data on the blockchain, and if an attacker wants to tamper with one of the data, the database of most nodes needs to be modified simultaneously in a short time and becomes effective when the next consensus is performed. It is very difficult to simultaneously attack firewalls of multiple servers and tamper with the same data, and there is only theoretical feasibility, so the block chain is considered to have very strong non-tamper property.
However, with the development of the blockchain technology, the user privacy problem is becoming a pain point for the academic and industrial fields to pay more and more attention. Due to the characteristics of blockchain full-node backup, any node locally stores all data on the blockchain network. If a certain user node uploads sensitive information which is not disclosed by subjective intention, other nodes can also obtain the information in the process of consensus and synchronization, so that the privacy of the user is difficult to ensure. To avoid this problem, block chain design engineers in the past typically employ two approaches to solve. The method has the advantages that firstly, uploading of sensitive transaction information is avoided as much as possible, and secondly, the sensitive information is encrypted, so that information leakage is prevented. However, in an actual business system, there must be a lot of information related to the business behavior itself, such as the name of the supplier, the kind of the product, the unit price, etc., and if such information is not uploaded at all, the normal business logic is violated, so that many related businesses cannot be developed. Therefore, the former cannot be realized in actual operation, and for the latter, the encryption can directly prevent the leakage of information to a certain extent, but the encryption mode is contrary to the idea of block chain data sharing. Once encrypted, the data loses availability, which is the most basic measure for statistical queries and various analyses, and thus the second approach also has its limitations.
Disclosure of Invention
The invention aims to provide a block chain data processing method and a block chain data processing system capable of protecting user privacy, which can be used for overcoming the defects of the prior art.
The invention is realized by the following technical scheme:
a data processing method of a block chain capable of protecting user privacy comprises the following steps:
A. initializing a block chain;
B. the user uploads data to the intelligent contract module through the local client, and if the data are uploaded successfully, the data are recorded in the storage module of the intelligent contract module; wherein the data comprises label class information and non-label class information;
C. the data processing module of the intelligent contract traverses the data in the storage module and hides the label information of the data;
D. the data processing module traverses the data in the storage module again, and judges whether each non-tag information has at least K-1 identical data in the data of the class to which the non-tag information belongs, if so, the step H is carried out, otherwise, the step E is carried out; wherein K is more than or equal to 2;
E. the data processing module judges whether the non-label type information with the same data less than K-1 is digital or non-digital, if yes, the step F is carried out; otherwise, entering step G;
F. d, the data processing module reduces the precision bit by bit from one bit according to the data condition in the category, and the step D is carried out when the precision is reduced by one bit;
G. the data processing module selects the common description preset in the data processing module to re-describe the required data according to the data condition in the category, and the step D is carried out every time re-description is carried out;
H. and the data processing module issues the data after the modification in the storage module.
Further, the step B specifically includes: the user sends the data to the logic module of the intelligent contract module through the local client, the logic operation function of the logic module stores the data in the storage module and records the process as a primary event, the intelligent contract module initiates consensus voting for the primary event, if the primary event passes, the data is recorded in the storage module, otherwise, the data cannot be recorded, and error information is returned to the local client.
Further, in the step C, a specific character is used to replace the tag information to implement hiding, and in the step F, a specific character is used to replace the numerical value of the corresponding bit to implement reduction of precision.
Furthermore, the tag information is identification information that can directly determine an individual, including an identification number, an ID, and/or a name.
Further, the non-tag class information is a minimum set of attributes that cannot directly identify an individual, but can be linked to an external table to identify an individual.
Further, in the step B, when the user uploads data to the intelligent contract module through the local client, the user needs to have a CA certificate for bidirectional authentication, and initiates an authentication request to the logic module of the intelligent contract module based on the CA certificate, and the user can send the data after the authentication is passed.
Further, the step a comprises the following steps:
a1, performing a first data synchronization and consensus operation on all local clients and nodes of the blockchain to start the blockchain;
a2, configuring and creating a first block;
a3, each node completes the first round of circulation retrieval and consensus, and after the completion of the first round of circulation retrieval and consensus is successful, the block chain is started successfully;
a4, each node generates its own public and private key pair, the public key is broadcast to make other nodes know, and the private key is left in local for signature and the like.
Furthermore, the block chain further comprises an output module, and the data processing module sends the data after the modification to the output module and the data is issued by the output module.
The invention is also realized by the following technical scheme:
a block chain capable of protecting user privacy comprises a plurality of local clients, an intelligent contract module arranged at the cloud end and a plurality of nodes connected with the intelligent contract module, wherein the intelligent contract module comprises a logic module, a storage module, a data processing module and an output module, the local clients are connected with the input end of the logic module, the output end of the logic module is connected with the storage module, the output end of the storage module is connected with the input end of the data processing module, the output end of the data processing module is connected with the input end of the output module, a user uploads data comprising tag information and non-tag information to the logic module through the local clients, and after the data pass through the nodes in a common identification way, the data is recorded in the storage module, the data processing module is used for carrying out hiding and non-tag information transformation processing on tag information of the data in the storage module, and the output module is used for issuing the data processed by the data processing module.
The invention has the following beneficial effects:
1. the data processing module of the invention carries out reconstruction processing on the data by hiding the label information and reducing the precision of the non-label information, thereby ensuring that the data still has usability while ensuring that the privacy of a user is not leaked; after the data containing the user privacy are uploaded successfully, the data are recorded in a storage module of an intelligent contract module, and the data are read in the intelligent contract, so that the steps of data processing are reduced, and the risk of user privacy disclosure is naturally reduced; the data processing module is integrated in the intelligent contract module, so that a third-party module is not needed to bear data processing, the possibility of disclosure of the third-party module is reduced, the privacy of a user can be better protected, the safety and the confidentiality are greatly increased, the complexity of the data processing module in data processing is reduced, and the data processing efficiency is improved.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
FIG. 1 is an architecture diagram of a blockchain of the present invention.
FIG. 2 is a flow chart of data processing according to the present invention.
Wherein, 1, a user; 2. a local client; 3. an intelligent contract module; 31. a logic module; 32. a storage module; 33. a data processing module; 34. an output module; 4. a node; 5. and (6) a cloud terminal.
Detailed Description
As shown in fig. 1, the block chain capable of protecting privacy includes a plurality of local clients 2, an intelligent contract module 3 disposed at a cloud 5, and a plurality of nodes 4 connected to the intelligent contract module 3, the intelligent contract module 3 includes a logic module 31, a storage module 32, a data processing module 33, and an output module 34, the local clients 2 are connected to an input end of the logic module 31, an output end of the logic module 31 is connected to the storage module 32, an output end of the storage module 32 is connected to an input end of the data processing module 33, an output end of the data processing module 33 is connected to an input end of the output module 34, a user 1 uploads data including tag-type information and non-tag-type information to the logic module 31 through the local clients 2, the data is stored and recorded in the storage module 32 after being commonly identified by the nodes 4, and the data is hidden by the data processing module 33, The non-tag information is modified, and the output module 34 issues the data processed by the data processing module 33.
As shown in fig. 2, the data processing method of the blockchain that can protect the privacy of the user 1 includes the following steps:
A. initializing a block chain; the method specifically comprises the following steps:
a1, performing a first data synchronization and consensus operation on all local clients 2 and nodes 4 of the blockchain to start the blockchain;
a2, configuring and creating a first block;
a3, each node 4 completes the first round of loop retrieval and consensus, and after the completion of the first round of loop retrieval and consensus is successful, the block chain is started successfully;
a4, each node 4 generates its own public and private key pair, the public key broadcasts to make other nodes 4 know, the private key is left in local for signature and other operations;
B. the user 1 uploads data to the intelligent contract module 3 through the local client 2, and if the data are uploaded successfully, the data are recorded in the storage module 32 of the intelligent contract module 3; the method specifically comprises the following steps:
b1, if the user 1 wants to upload data through the local client 2, the user needs to have a CA certificate for bidirectional authentication, and initiates an identity authentication request to the logic module 31 of the intelligent contract module 3 based on the CA certificate;
b2, after the identity authentication is passed, the user 1 obtains the right of sending data, and the user 1 sends a data sending request to the intelligent contract module 3;
b3, after receiving the request, the intelligent contract module 3 sends a message requesting permission;
b4, after receiving the message requesting permission, the local client 2 sends the data to the logic module 31;
b5, the logic module 31 stores the received data in the storage module 32 and records the process as an event;
b6, the intelligent contract module 3 randomly selects one node 4 as the Leader node 4 to initiate the consensus of the event, and each node 4 carries out independent verification and voting;
b7, if the number of votes exceeds 2/3 of the total number of nodes 4, the event passes, and the data is recorded in the storage module 32; otherwise, the event does not pass, the data cannot be recorded, and error information is returned to the local client 2;
when a user 1 uploads non-sensitive data to an intelligent contract module 3 through a local client 2, the non-sensitive data is subjected to hash function operation and packaged into a data packet, the data packet is signed by a private key and then broadcast to other nodes 4 through the intelligent contract module 3 for verification for multiple times, the intelligent contract module 3 initiates voting after verification, if the data packet passes the verification, a new block generated by the data packet is connected in series with the last block (if the data uploading is that the data is uploaded for the first time by a block chain system, the new block is connected in series with the first block);
the data includes tag information and non-tag information, and as shown in table 1, the tag information is identification information that can directly determine an individual, including an identification number and a name; non-tag class information is the minimum set of attributes that cannot directly determine an individual, but can be identified by linking to external tables, including height, weight, and whether an individual is diabetic:
TABLE 1
| Identity card number | Name (I) | Height of a person | Body weight | Patients with diabetes |
| 3505… | Zhang San | 165 | Heavy bias | Whether or not |
| 3505… | Li Si | 175 | Heavy load | Is that |
| 3505… | Xiao Hong | 155 | Is normal | Whether or not |
| 3505… | Small orchid | 170 | Is lighter than normal | Whether or not |
| 3505… | Wangsan | 172 | Light and lightweight | Is that |
| 3505… | Xiaoming liquor | 180 | Weight bias | Is that |
C. The data processing module 33 of the smart contract traverses the data in the storage module 32, and replaces the id number and name information with a specific character "×" to hide the tag class information of the data, as shown in table 2:
TABLE 2
D. The data processing module 33 traverses the data in the storage module 32 again, and determines whether there are at least K-1 identical data in the data of the category to which the non-tag information belongs (the category refers to the column in which the data is located), if yes, step H is performed, otherwise, step E is performed; wherein K is more than or equal to 2;
E. the data processing module 33 judges whether the non-tag type information with the same data less than K-1 is digital or non-digital, if so, the process goes to step F; otherwise, entering step G;
F. the data processing module 33 reduces the precision bit by bit from the single bit according to the data condition in the category, and the step D is carried out when the precision is reduced by one bit; in table 2, after the ones of all the height column data are replaced by "+", the data in the first row, the third row and the sixth row cannot find at least one data same as the ones, so the tens of all the height column data are also reduced in accuracy, that is, the tens are replaced by "+";
G. the data processing module 33 selects the common description preset in the data processing module 33 to re-describe the required data according to the data condition in the category, and the step D is carried out every time re-description is carried out;
H. the data processing module 33 issues the modified data in the storage module 32, as shown in table 3:
TABLE 3
As can be seen from table 3, description of "heavy" as "heavy", description of "light" as "light", and description of "normal" as "light" are performed, and such description rules are preset by the data processing module 33. More specifically, when the intelligent contract is released, that is, the attributes of the row and the column of the table are determined, and when the user 1 uploads the data, the corresponding data can be uploaded only according to the determined table attributes, so that it is possible to preset the data modification rule according to each table attribute.
In an extreme case, when at least K-1 identical data can not be satisfied after hiding the ones or tens digits of the numbers, the data modification can be realized by replacing the specific numbers with the ranges, as shown in table 4:
TABLE 4
| Identity card number | Name (I) | Height of a person | Body weight | Patients with diabetes |
| * | * | [151,170] | Heavy load | Whether or not |
| * | * | [171,190] | Heavy load | Is that |
| * | * | [151,170] | Light and light | Whether or not |
| * | * | [151,170] | Light and lightweight | Whether or not |
| * | * | [171,190] | Light and lightweight | Is that |
| * | * | [171,190] | Heavy load | Is that |
The above description is only a preferred embodiment of the present invention, and therefore should not be taken as limiting the scope of the invention, which is defined by the appended claims and their equivalents and modifications within the scope of the description.
Claims (7)
1. A data processing method of a block chain capable of protecting user privacy is characterized in that: the block chain comprises a plurality of local clients, an intelligent contract module arranged at the cloud end and a plurality of nodes connected with the intelligent contract module, and the data processing method comprises the following steps:
A. initializing a block chain;
B. the user uploads data to the intelligent contract module through the local client, and if the data are uploaded successfully, the data are recorded in the storage module of the intelligent contract module; wherein the data comprises label class information and non-label class information;
C. the data processing module of the intelligent contract traverses the data in the storage module and hides the label information of the data;
D. the data processing module traverses the data in the storage module again, judges whether each non-tag information has at least K-1 same data in the data of the class to which the non-tag information belongs, if so, enters step H, otherwise, enters step E; wherein K is more than or equal to 2;
E. the data processing module judges whether the non-label type information with the same data less than K-1 is digital or non-digital, if yes, the step F is carried out; otherwise, entering step G;
F. d, the data processing module reduces the precision bit by bit from one bit according to the data condition in the category, and the step D is carried out when the precision is reduced by one bit;
G. the data processing module selects the common description preset in the data processing module to re-describe the required data according to the data condition in the category, and the step D is carried out every time re-description is carried out;
H. the data processing module issues the data after the modification processing in the storage module;
the step A comprises the following steps:
a1, performing a first data synchronization and consensus operation on all local clients and nodes of the blockchain to start the blockchain;
a2, configuring and creating a first block;
a3, each node completes the first round of circulation retrieval and consensus, and after the completion of the first round of circulation retrieval and consensus is successful, the block chain is started successfully;
a4, each node generates its own public-private key pair, the public key is broadcast to make other nodes know, and the private key is left locally for signature operation.
2. The method for processing blockchain data according to claim 1, wherein the method further comprises: in the step C, the specific character is used to replace the label information to realize hiding, and in the step F, the specific character is used to replace the numerical value of the corresponding bit to realize reduction of precision.
3. The method for processing blockchain data according to claim 1 or 2, wherein the method comprises: the label information is identification information which can directly determine a certain individual and comprises an identity card number, an ID and/or a name.
4. The method for processing blockchain data according to claim 1 or 2, wherein the method comprises: the non-tag class information is the minimum set of attributes that cannot directly determine an individual, but can identify the individual by linking with an external table.
5. The method for processing data of a blockchain according to claim 1 or 2, wherein the method comprises: in the step B, when the user uploads the data to the intelligent contract module through the local client, the user needs to have a CA certificate for bidirectional authentication, and initiates an authentication request to the logic module of the intelligent contract module based on the CA certificate, and the user can send the data after the authentication is passed.
6. The method for processing data of a blockchain according to claim 1 or 2, wherein the method comprises: the block chain further comprises an output module, and the data processing module sends the data after the transformation processing to the output module and the data are issued by the output module.
7. A blockchain data processing system that protects user privacy, comprising: including a plurality of local clients, set up at the intelligent contract module in high in the clouds and a plurality of nodes of being connected with intelligent contract module, intelligent contract module includes logic module, storage module, data processing module and output module, and local client is connected with the logic module input, and the logic module output is connected with storage module, and the storage module output is connected with data processing module input, and the data processing module output is connected with the output module input, at first carries out the block chain initialization: all local clients and nodes of the block chain perform first data synchronization and common identification operation to start the block chain; configuring and creating a first block; each node completes the first round of circulation retrieval and consensus, and after successful completion, the block chain is successfully started; each node generates a private and public key pair, the public key is broadcasted to enable other nodes to know, the private key is reserved locally for signature operation, then a user uploads data comprising label information and non-label information to the logic module through a local client, after the data passes the common identification of each node, the data is recorded in the storage module, the label information of the data in the storage module of the data processing module is hidden, and the non-label information is reformed, and the specific process is as follows: the data processing module traverses the data in the storage module, judges whether each non-label information has at least K-1 identical data in the data of the category to which the non-label information belongs, if so, the data in the storage module is issued, otherwise, judges whether the non-label information with less than K-1 identical data is digital or non-digital, if so, the precision is reduced bit by bit from the bit according to the data condition in the category, each bit precision is reduced, the traversal judgment is carried out again to judge whether each non-label information has at least K-1 identical data in the data of the category, if not, the common description preset in the data processing module is selected to carry out the redescription on the required data according to the data condition in the category, each time of the redescription is carried out again, and the traversal judgment is carried out again to judge whether each non-label information has at least K-plus-value in the data of the category 1, the output module issues the data processed by the data processing module.
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Application publication date: 20210604 Assignee: Quanzhou Tonghua Technology Co.,Ltd. Assignor: QUANZHOU-HUST INTELLIGENT MANUFACTURING FUTURE Contract record no.: X2023350000273 Denomination of invention: A Blockchain Data Processing Method and System that Can Protect User Privacy Granted publication date: 20220819 License type: Common License Record date: 20230530 |