CN111177747B - Block chain-based social network privacy data protection method - Google Patents
Block chain-based social network privacy data protection method Download PDFInfo
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- CN111177747B CN111177747B CN201911286353.1A CN201911286353A CN111177747B CN 111177747 B CN111177747 B CN 111177747B CN 201911286353 A CN201911286353 A CN 201911286353A CN 111177747 B CN111177747 B CN 111177747B
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Abstract
The invention discloses a social network privacy data protection method based on a block chain. The method comprises the following steps: firstly, acquiring all user information data on a social network, and dividing the user information data into user personal basic privacy data and user social sharing privacy data; then, different privacy data protection method operations are carried out for two different data: for the protection of the basic private data of the user, firstly, anonymizing the information by using a block chain Hash function, then, cutting the single user information into small data blocks, respectively carrying out Hash and then connecting in series to finally form a Merkle tree structure; for protecting the social private data sharing of the users, the transaction address of each user is concealed in a Hash value mode by using the transaction principle of a block chain, and then the shared data information is encrypted and signed by using an asymmetric encryption and digital signature algorithm. The invention improves the safety of the user information data in the social network.
Description
Technical Field
The invention relates to the technical field of block chains, in particular to a social network privacy data protection method based on a block chain.
Background
With the advent of the network age, social networking has become one of the most promising internet application services. In recent years, due to the development and popularization of technologies such as data mining and cloud computing, social networks provide abundant personalized services for users and have the problem of privacy disclosure caused by mass data storage. The data categories on the social network platform are various, and different privacy protection schemes exist in different data categories.
Currently, there is a great deal of research into protecting private data on social networks. Anonymous privacy protection techniques that allow users to submit without revealing their identity, such as by hiding or not collecting the user's identity-sensitive information or data; privacy data protection based on association rules is carried out by utilizing data interference and query limit strategies; more research is directed to setting and controlling access rights to data in social networks. Although the protection method is effective, most of the protection methods aim at the proposed personal basic privacy of the user, the protection methods are too single, the social network privacy data are difficult to protect in a targeted manner, and the social network platform still has the problems of a large amount of personal basic information leakage and information leakage among nodes in the process of sharing and transmitting the privacy data.
Disclosure of Invention
The invention aims to provide a social network privacy data protection method which can solve the problems of leakage of personal basic information of a social network platform and information leakage of privacy data among nodes in a sharing transmission process and improve the safety of user information data in a social network.
The technical solution for realizing the purpose of the invention is as follows: a social network private data protection method based on a block chain comprises the following steps:
acquiring all user information data on a social network, and dividing the user information data into user personal basic privacy data and user social sharing privacy data;
different privacy data protection method operations are carried out aiming at two different data:
for protecting the personal basic private data of the user, firstly, anonymizing the information by using a block chain Hash function, then, cutting the single user information into small data blocks, respectively carrying out Hash and then connecting the data blocks in series to finally form a Merkle tree structure, and storing the Merkle tree structure on a block chain;
for protecting the social shared private data of the users, firstly, the transaction address of each user is concealed in a Hash value mode by using a transaction principle of a block chain, and then, the shared data information is encrypted and signed by using an asymmetric encryption and digital signature algorithm.
Further, the private data protection method operation includes protection method operation on user identity information, information to be shared by the user and a user address.
Further, for protecting the basic private data of the user, anonymizing the information by using a block chain Hash function, cutting the single user information into small data blocks, respectively performing Hash and then connecting the data blocks in series to finally form a Merkle tree structure, and storing the Merkle tree structure on a block chain, wherein the specific steps are as follows:
(1.1) acquiring personal basic data information of a user;
(1.2) cutting the whole user personal data into data blocks;
(1.3) anonymizing a Hash value of a minimum user personal data block by using a Hash function of a block chain;
(1.4) connecting two minimum user personal data blocks in series, and repeating the operation of anonymizing the Hash value by using the Hash function of the block chain in the step (1.3);
(1.5) repeating the operation step (1.4) in a circulating way until the personal data of the whole user are connected in series to form a Hash value of the personal data of the whole user;
(1.6) performing upward concatenation operation to form a Merkle tree shown in the form of Hash function values, and storing the Merkle tree into a block chain social network database.
Further, for the protection of the social shared private data of the users, firstly, the transaction address of each user is concealed in a Hash value form by using a transaction principle of a block chain, and then, the shared data information is encrypted and signed by using an asymmetric encryption and digital signature algorithm, which specifically comprises the following steps:
(2.1) obtaining a unique social network address of each user;
(2.2) hiding the social network address of each user in a Hash value mode by utilizing a transaction principle of a block chain;
and (2.3) applying an RSA digital signature algorithm in the block chain to social network platform user sharing, signing by using a private key of a user in the block chain to form new information to be shared, broadcasting the information to the block chain system by the user, and verifying by using a public key of the user by other nodes in the system.
Further, the RSA digital signature algorithm in the block chain is applied to the social network platform user sharing in step (2.3), the user in the block chain signs with its own private key to form new information to be shared, then the user broadcasts the information to the block chain system, and other nodes in the system verify with the public key of the user, which is specifically as follows:
(1) a user A edits a segment of social network information to be sent;
(2) the user A uses a Hash function algorithm to carry out Hash on the social network information to be sent, and a Hash value H1 is obtained;
(3) the user A uses a private key of the user A to sign and encrypt the Hash value H1 to obtain S (H);
(4) the user A sends the signature S (H) and the social network information to be sent to the user B through the block chain network;
(5) after receiving the social network information, the user B decrypts the digital signature S (H) by using the public key of the user A to obtain H1, and performs Hash on the received social network information by using a Hash function algorithm again to obtain a Hash value H2;
(6) the user B compares the H1 with the H2, if the H1 and the H2 are equal, the social network information is not tampered, and meanwhile, the privacy of the information is guaranteed; and (4) if the social network information is not equal, the social network information is tampered, and the step (1) is returned to send the information again.
Compared with the prior art, the invention has the following remarkable advantages: (1) By dividing different data categories in the social network into two categories and applying different block chain privacy protection methods to the different data categories, the privacy data of the social network are effectively and pertinently protected; (2) The problems of leakage of personal basic information of the social network platform and information leakage of private data among nodes in the sharing and transmission process are solved, and the safety of user information data in the social network is improved.
Drawings
Fig. 1 is a schematic flow chart of the basic protection of private data of a user based on a blockchain according to the present invention.
FIG. 2 is a schematic structural diagram of a user's personal basic privacy data Merkle tree based on a block chain in the present invention.
Fig. 3 is a schematic flow diagram illustrating protection of private data shared by a user in social contact based on a block chain RSA algorithm in the present invention.
Detailed Description
The block chain is used as a decentralized distributed database and can be well applied to social network privacy data protection. At present, there are the following privacy data protection schemes for blockchains: 1) Anonymous Hash storage is carried out on the chain; 2) Encryption protection: the encryption algorithm is divided into a symmetric encryption algorithm and an asymmetric encryption algorithm.
The two schemes can be respectively used for protecting the personal basic privacy data of the user and the social shared privacy data of the user in the social network. The invention applies the block chain technology to the social network, can more comprehensively prevent the privacy information generated in the social media from being leaked to a greater extent, and more fully protect the user identity.
The invention relates to a block chain-based social network privacy data protection method, which comprises the following steps:
acquiring all user information data on a social network, and dividing the user information data into user personal basic privacy data and user social sharing privacy data;
different privacy data protection method operations are carried out aiming at two different data:
for protecting the personal basic private data of the user, firstly, anonymizing the information by using a block chain Hash function, then, cutting the single user information into small data blocks, respectively carrying out Hash and then connecting the data blocks in series to finally form a Merkle tree structure, and storing the Merkle tree structure on a block chain;
for protecting the social shared private data of the users, firstly, the transaction address of each user is concealed in a Hash value mode by using a transaction principle of a block chain, and then, the shared data information is encrypted and signed by using an asymmetric encryption and digital signature algorithm.
Further, the private data protection method includes protection method operations for user identity information, user information to be shared, and a user address.
Further, for protecting the basic private data of the user, anonymizing the information by using a block chain Hash function, cutting the single user information into small data blocks, respectively performing Hash and then connecting the data blocks in series to finally form a Merkle tree structure, and storing the Merkle tree structure on a block chain, wherein the specific steps are as follows:
(1.1) acquiring personal basic data information of a user;
(1.2) cutting the whole user personal data into data blocks;
(1.3) anonymizing a Hash value of a minimum user personal data block by utilizing a Hash function of a block chain;
(1.4) connecting two minimum user personal data blocks in series, and repeating the operation of anonymizing the Hash value by using the Hash function of the block chain in the step (1.3);
(1.5) repeating the operation step (1.4) circularly until the personal data of the whole user are connected in series to form a Hash value of the personal data of the whole user;
(1.6) performing upward concatenation operation to form a Merkle tree shown in the form of Hash function values, and storing the Merkle tree into a block chain social network database.
Further, for the protection of the social shared private data of the users, firstly, the transaction address of each user is concealed in a Hash value form by using a transaction principle of a block chain, and then, the shared data information is encrypted and signed by using an asymmetric encryption and digital signature algorithm, which specifically comprises the following steps:
(2.1) obtaining a unique social network address of each user;
(2.2) hiding the social network address of each user in a Hash value mode by utilizing a transaction principle of a block chain;
and (2.3) applying an RSA digital signature algorithm in the block chain to social network platform user sharing, signing by using a private key of a user in the block chain to form new information to be shared, broadcasting the information to a block chain system by the user, and verifying by using a public key of the user by other nodes in the system.
Further, the RSA digital signature algorithm in the block chain is applied to the social network platform user sharing in step (2.3), the user in the block chain signs with its own private key to form new information to be shared, then the user broadcasts the information to the block chain system, and other nodes in the system verify with the public key of the user, which is specifically as follows:
(1) a user A edits a segment of social network information to be sent;
(2) the user A uses a Hash function algorithm to carry out Hash on the social network information to be sent, and a Hash value H1 is obtained;
(3) the user A uses a private key of the user A to sign and encrypt the Hash value H1 to obtain S (H);
(4) the user A sends the signature S (H) and the social network information to be sent to the user B through a block chain network;
(5) after receiving the social network information, the user B decrypts the digital signature S (H) by using the public key of the user A to obtain H1, and performs Hash on the received social network information again by using a Hash function algorithm to obtain a Hash value H2;
(6) the user B compares the H1 with the H2, if the H1 and the H2 are equal, the social network information is not tampered, and meanwhile, the privacy of the information is guaranteed; and (4) if the social network information is not equal, the social network information is tampered, and the step (1) is returned to send the information again.
The invention is described in further detail below with reference to the figures and the specific embodiments.
Examples
With reference to fig. 1, the method for protecting privacy data of a social network based on a block chain according to the present invention includes the following steps:
step 1, dividing user information data into user personal basic privacy data and user social sharing privacy data, which specifically comprises the following steps:
acquiring all user information data on a social network, and dividing the data into user personal basic privacy data and user social sharing privacy data according to the definition of related documents and different data of the social network;
the personal basic privacy data of the user comprises personal basic data of the user and records left by the user in actions of accessing, browsing and the like in a social network, wherein the personal basic data comprises personal identity information and content closely related to feature information. Through the acquisition of the sensitive information, the personal interests, the living habits and the like of the user can be analyzed.
The user social contact shared private data refers to side information left by mutual communication and contact among nodes.
Step 2, different privacy data protection method operations are carried out on two different data;
step 3, for protecting the personal basic private data of the user, firstly anonymizing the information by using a block chain Hash function, then cutting the single user information into small data blocks, respectively carrying out Hash and then connecting in series to finally form a Merkle tree structure, and storing the Merkle tree structure on a block chain, wherein the method specifically comprises the following steps:
step 3.1, obtaining personal basic data information of a user;
step 3.2, cutting the whole user personal data into small data blocks, as shown in fig. 2, dividing one user personal data into a name data block, a gender data block, an age data block, a mailbox data block and the like;
step 3.3, anonymizing a Hash value of a minimum user personal data block by utilizing a Hash function of a block chain, and marking as Hash1;
step 3.4, connecting the two minimum user personal data blocks in series, and repeating the operation of anonymizing the Hash value by using the Hash function of the block chain in the step 3.3 and marking the operation as Hash1-2;
step 3.5, repeating the loop operation step 3.4 until the whole user personal data is connected in series to form a Hash value of the whole user personal data, namely Hash1-4 in the figure 2;
and 3.6, performing upward serial operation to form a Merkle tree displayed in a Hash function value form, and storing the Merkle tree into a block chain social network database.
And 4, protecting the social shared private data of the users, hiding the transaction address of each user in a Hash value form by using a transaction principle of a block chain, and then carrying out encryption signature on the shared data information by using an asymmetric encryption and digital signature algorithm, wherein the method specifically comprises the following steps:
step 4.1, obtaining a unique social network address of each user;
step 4.2, hiding the social network address of each user in a Hash value mode by utilizing a transaction principle of a block chain;
step 4.3, applying the RSA digital signature algorithm in the block chain to the social network platform user sharing, signing by the user in the block chain with the private key of the user to form new information to be shared, then broadcasting the information to the block chain system by the user, and verifying by other nodes in the system using the public key of the user, which is specifically as follows in combination with fig. 3:
step 4.3.1, the user A edits a section of social network information to be sent;
step 4.3.2, the user A uses a Hash function algorithm to carry out Hash on the social network information to be sent, and a Hash value H1 is obtained;
4.3.3, the user A uses the private key of the user A to sign and encrypt the Hash value H1 to obtain S (H);
step 4.3.4, user a sends signature S (H) and social network information to be sent to user B through the block chain network;
step 4.3.5, after receiving the message, the user B decrypts the digital signature S (H) by using the public key of the user A to obtain H1, and performs Hash on the received social network information by using a Hash function algorithm again to obtain a Hash value H2;
step 4.3.6, the user B compares the H1 with the H2, if the H1 and the H2 are equal, the social network information is not tampered, and meanwhile, the privacy of the information is guaranteed; and if the social network information is not equal to the social network information, tampering the social network information, and returning to the step 4.3.1 to send the information again.
According to the method, different data categories in the social network are divided into two categories, and different block chain privacy protection methods are applied to the different data categories, so that the privacy data of the social network are effectively and specifically protected; the problems of leakage of personal basic information of the social network platform and information leakage of private data among nodes in the sharing and transmission process are solved, and the safety of user information data in the social network is improved.
Claims (3)
1. A social network private data protection method based on a block chain is characterized by comprising the following steps:
acquiring all user information data on a social network, and dividing the user information data into user personal basic privacy data and user social sharing privacy data;
different privacy data protection method operations are carried out aiming at two different data:
for the protection of the basic private data of the user, firstly, anonymizing the information by using a block chain Hash function, then, cutting the single user information into small data blocks, respectively carrying out Hash and then connecting the data blocks in series to finally form a Merkle tree structure, and storing the Merkle tree structure on a block chain;
for protecting social private data sharing of users, firstly, hiding a transaction address of each user in a Hash value form by using a transaction principle of a block chain, and then carrying out encryption signature on shared data information by using an asymmetric encryption and digital signature algorithm;
for the protection of the basic private data of the user, firstly, the information is anonymized by using a block chain Hash function, then, the single user information is cut into small data blocks, the small data blocks are respectively Hash-processed and then are connected in series, and finally, a Merkle tree structure is formed and stored on a block chain, and the method specifically comprises the following steps:
(1.1) acquiring personal basic data information of a user;
(1.2) cutting the whole user personal data into data blocks;
(1.3) anonymizing a Hash value of a minimum user personal data block by utilizing a Hash function of a block chain;
(1.4) connecting two minimum user personal data blocks in series, and repeating the operation of anonymizing the Hash value by using the Hash function of the block chain in the step (1.3);
(1.5) repeating the operation step (1.4) in a circulating way until the personal data of the whole user are connected in series to form a Hash value of the personal data of the whole user;
(1.6) performing upward series operation to form a Merkle tree displayed in the form of a Hash function value, and storing the Merkle tree into a block chain social network database;
for the protection of the social shared private data of the users, firstly, the transaction principle of a block chain is utilized, the transaction address of each user is concealed in a Hash value mode, and then, the shared data information is encrypted and signed by using an asymmetric encryption and digital signature algorithm, which specifically comprises the following steps:
(2.1) obtaining a unique social network address of each user;
(2.2) hiding the social network address of each user in a Hash value form by using a transaction principle of a block chain;
and (2.3) applying an RSA digital signature algorithm in the block chain to social network platform user sharing, signing by using a private key of a user in the block chain to form new information to be shared, broadcasting the information to the block chain system by the user, and verifying by using a public key of the user by other nodes in the system.
2. The method for protecting privacy data of a social network based on a block chain according to claim 1, wherein the operation of the privacy data protection method comprises operation of a protection method for user identity information, user information to be shared and a user address.
3. The method according to claim 1, wherein the RSA digital signature algorithm in the block chain is applied to social network platform user sharing in step (2.3), a user in the block chain signs with its own private key to form new information to be shared, and then the user broadcasts the information to the block chain system, and other nodes in the system verify using the public key of the user, which is specifically as follows:
(1) a user A edits a segment of social network information to be sent;
(2) the user A uses a Hash function algorithm to carry out Hash on the social network information to be sent, and a Hash value H1 is obtained;
(3) the user A uses a private key of the user A to sign and encrypt the Hash value H1 to obtain S (H);
(4) the user A sends the signature S (H) and the social network information to be sent to the user B through the block chain network;
(5) after receiving the social network information, the user B decrypts the digital signature S (H) by using the public key of the user A to obtain H1, and performs Hash on the received social network information by using a Hash function algorithm again to obtain a Hash value H2;
(6) the user B compares the H1 with the H2, if the H1 and the H2 are equal, the social network information is not tampered, and meanwhile, the privacy of the information is guaranteed; and (4) if the social network information is not equal, the social network information is tampered, and the step (1) is returned to send the information again.
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| CN110046521A (en) * | 2019-04-24 | 2019-07-23 | 成都派沃特科技股份有限公司 | Decentralization method for secret protection |
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