CN116226270A - Block chain-based zone bit positioning method, system, equipment and storage medium - Google Patents

Block chain-based zone bit positioning method, system, equipment and storage medium Download PDF

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CN116226270A
CN116226270A CN202211556925.5A CN202211556925A CN116226270A CN 116226270 A CN116226270 A CN 116226270A CN 202211556925 A CN202211556925 A CN 202211556925A CN 116226270 A CN116226270 A CN 116226270A
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target
node
area
data
polygon
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石显锋
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OneConnect Financial Technology Co Ltd Shanghai
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OneConnect Financial Technology Co Ltd Shanghai
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • 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
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F21/60—Protecting data
    • G06F21/602—Providing cryptographic facilities or services
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F21/60—Protecting data
    • G06F21/64—Protecting data integrity, e.g. using checksums, certificates or signatures
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • 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
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Abstract

The invention relates to the technical field of blockchains, and discloses a blockchain-based zone location method, a blockchain-based zone location system, electronic equipment and a storage medium. The method is characterized in that the position relation between the position of the target user and the target area is converted into the area relation between the target point corresponding to the position of the target user and the target polygon corresponding to the target area based on an encryption algorithm, the position information of the target point is at a user end node, the vertex data information of the target polygon is at a platform side node, plaintext data of the user end node and plaintext data of other sides are not locally known by any side, the problem that a large amount of user data is easy to leak due to existing location positioning is solved, privacy protection of user travel data is achieved, safety of the user position data is improved, and risk of user data leakage is reduced.

Description

Block chain-based zone bit positioning method, system, equipment and storage medium
Technical Field
The present invention relates to the field of blockchain technologies, and in particular, to a blockchain-based location positioning method, system, electronic device, and storage medium.
Background
In the present mobile digital age, the application scenarios of location positioning are very many, such as location positioning and vehicle scheduling when a network is used for about, merchant recommendation when a takeaway is purchased, and the like.
In the prior art, when the application scenes acquire the position information, the GPS positioning system of the mobile phone acquires the position coordinate information, and then the coordinate information is utilized to carry out the subsequent business process, and in the business process, the position coordinate information is used in the form of plaintext data. The method can not carry out privacy protection on the position information of the user, if the platform side system is attacked, a large amount of user data can be leaked, so that plaintext data of the position information of the user can be illegally acquired, and the safety is low.
Disclosure of Invention
In order to solve the problems that the existing location positioning cannot carry out privacy protection on the position information of the user, if a platform side system is attacked, a large amount of user data is leaked, so that plaintext data of the position information of the user is illegally acquired, and the safety is low, the invention provides a location positioning method, a location positioning system, electronic equipment and a storage medium based on a block chain.
In order to solve the above problems, an embodiment of the present invention provides a location positioning method based on a blockchain, where the blockchain includes a supervisor node, a platform node and a user end node, and the method includes:
the platform square node converts a target area into a target polygon, and acquires vertex plaintext data of the target polygon and the area of the target polygon; the target area is a planned area in positioning the location;
the user terminal node acquires plaintext data of a target point; the plaintext data of the target point is the position information of the target point where the target user is located;
the supervisor node generates a public key and a private key according to an encryption algorithm; the public key is broadcast to the platform side node and the user side node through a block chain link point, and the private key is held by the supervisor side node;
the user terminal node encrypts the target point plaintext data according to the public key to obtain target point ciphertext data, and broadcasts the target point ciphertext data to the platform side node;
the platform side node encrypts the vertex plaintext data according to the public key to obtain vertex ciphertext data, multiplies the target point ciphertext data and the vertex ciphertext data to obtain reference ciphertext data, and broadcasts the reference ciphertext data to the supervisor side node and the user side node;
The supervisor node decrypts the reference ciphertext data according to the private key to obtain reference plaintext data, and broadcasts the reference plaintext data to the platform node;
the platform side node calculates the total area of the triangle defined by the target point and the target polygon according to the reference plaintext data and the vertex plaintext data, and broadcasts the total area and the target polygon area to the user side node;
and the user terminal node judges the position relation between the target point and the target area according to the total area and the target polygon area.
Optionally, the method that the supervisor node generates the public key and the private key according to the encryption algorithm specifically includes: and the supervisor node generates a public key and a private key according to the EIgamal encryption algorithm.
Optionally, the mode that the platform side node multiplies the target point ciphertext data and the vertex ciphertext data to obtain the reference ciphertext data specifically includes:
the platform side node calculates the target point ciphertext data and the vertex ciphertext data according to the following formula to obtain reference ciphertext data:
Figure SMS_1
where EXA is ciphertext data of the target point A (xa, ya) on the x-axis, EYA is ciphertext data of the target point A (xa, ya) on the y-axis, E (yb-yc) is ciphertext data of a distance difference between adjacent vertices B (xb, yb) and C (xc, yc) of the target polygon on the y-axis, E (xb-xc) is ciphertext data of a distance difference between adjacent vertices B (xb, yb) and C (xc, yc) of the target polygon on the x-axis, and EM1 and EM2 are reference ciphertext data.
Optionally, the platform side node calculates a total area of a triangle defined by the target point and the target polygon according to the reference plaintext data and the vertex plaintext data, including:
the platform side node sequentially calculates the area of a triangle defined by the target point and the adjacent vertex of the target polygon based on the reference plaintext data and the vertex plaintext data;
and the platform square node performs addition processing on the areas of all triangles defined by the target point and the target polygon to obtain the total area of the triangles defined by the target point and the target polygon.
Optionally, the platform side node sequentially calculates an area of a triangle defined by the target point and an adjacent vertex of the target polygon based on the reference plaintext data and the vertex plaintext data, including:
the platform square node calculates the area of a triangle defined by the target point and an adjacent vertex of the target polygon according to the following formula:
S1＝0.5*[DM1-DM2+(xb*yc-xc*yb)]
wherein DM1 is plaintext data obtained by decrypting EM1, DM2 is plaintext data obtained by decrypting EM2, S1 is the area of a triangle defined by a target point and adjacent vertexes B (xb, yb) and C (xc, yc) of the target polygon;
And the platform square node sequentially calculates the areas of triangles formed by all adjacent vertexes of the target polygon and the target point.
Optionally, the determining, by the user end node, the positional relationship between the target point and the target area according to the total area and the target polygon area includes:
the user terminal node judges whether the total area is equal to the target polygonal area or not;
if the total area is equal to the target polygon area, the user end section confirms that the target user is located in the target area;
and if the total area is not equal to the target polygonal area, the user end section confirms that the target user is not located in the target area.
Optionally, the mode of converting the target area into the target polygon by the platform side node is specifically: and selecting a polygon to be inscribed or circumscribed on the target area by the platform square node, enabling the area difference between the polygon and the target area to be lower than a specified threshold value, and taking the polygon as a target polygon.
In order to solve the above problems, an embodiment of the present invention further provides a location positioning system based on a blockchain, where the blockchain includes a supervisor node, a platform node, and a user end node, and the system includes:
The conversion module is used for converting the target area into a target polygon through the platform square node; the target area is a planned area in positioning the location;
the first acquisition module is used for acquiring vertex plaintext data of the target polygon and the area of the target polygon through the platform square node;
the second acquisition module is used for acquiring plaintext data of a target point through the user terminal node; the plaintext data of the target point is the position information of the target point where the target user is located;
the key module is used for generating a public key and a private key according to an encryption algorithm through the supervisor node; the public key is broadcast to the platform side node and the user side node through a block chain link point, and the private key is held by the supervisor side node;
the first encryption module is used for encrypting the target point plaintext data according to the public key through the user terminal node to obtain target point ciphertext data, and broadcasting the target point ciphertext data to the platform side node;
the second encryption module is used for encrypting the vertex plaintext data according to the public key through the platform side node to obtain vertex ciphertext data;
the operation module is used for carrying out multiplication operation on the target point ciphertext data and the vertex ciphertext data through the platform side node to obtain reference ciphertext data, and broadcasting the reference ciphertext data to the supervisor side node and the user side node;
The decryption module is used for decrypting the reference ciphertext data according to the private key through the supervisor node to obtain reference plaintext data, and broadcasting the reference plaintext data to the platform side node;
the calculation module is used for calculating the total area of the triangle defined by the target point and the target polygon according to the reference plaintext data and the vertex plaintext data through the platform side node, and broadcasting the total area and the target polygon area to the user side node;
and the judging module is used for judging the position relation between the target point and the target area according to the total area and the target polygon area through the user terminal node.
In order to solve the above problem, an embodiment of the present invention further provides an electronic device, including:
at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the blockchain-based location positioning method described above.
To solve the above-mentioned problems, embodiments of the present invention also provide a computer readable storage medium having at least one computer program stored therein, the at least one computer program being executed by a processor in an electronic device to implement the above-mentioned blockchain-based location positioning method.
The technical scheme provided by the embodiment of the invention can comprise the following beneficial effects:
in the embodiment of the invention, a platform side node converts a target area into a target polygon, acquires vertex plaintext data and a target polygon area of the target polygon, a user side node acquires target plaintext data, a supervisor side node generates a public key and a private key according to an encryption algorithm, then the user side node encrypts the target plaintext data according to the public key to obtain target ciphertext data and broadcasts the target ciphertext data to the platform side node, the platform side node encrypts the vertex plaintext data according to the public key to obtain vertex ciphertext data and multiplies the target ciphertext data and the vertex ciphertext data to obtain reference ciphertext data, and broadcasts the reference ciphertext data to the supervisor side node and the user side node, the supervisor side node decrypts the reference ciphertext data according to the private key to obtain reference plaintext data and broadcasts the reference plaintext data to the platform side node, then the platform side node calculates the total area of a triangle defined by the target point and the target polygon according to the reference plaintext data and the vertex plaintext data and broadcasts the total area and the target polygon area to the user side node, and the user side node judges the position relation between the target point and the target area according to the total area and the target polygon area. According to the embodiment of the invention, the data of each party is encrypted and cultured through an encryption algorithm, when the data or a process result is disputed, a supervision party carries out audit and tracing on the statistical process according to the data on the chain, and the supervision party does not hold the data of each party; the data disclosed by each party is in a desensitization state, namely a ciphertext state, any party does not know the plaintext data of other parties, and the plaintext data of each party is not local, so that the problems that the existing zone location positioning cannot carry out privacy protection on the position information of a user, a large amount of user data are leaked if a platform party system is attacked, the plaintext data of the position information of the user are illegally acquired, and the safety is low are solved, the privacy protection on the user travel data is realized, the safety of the user position data is improved, and the risk of user data leakage is reduced.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a flowchart of a block chain based location positioning method according to an embodiment of the present invention;
FIG. 2 is a block chain network architecture diagram according to one embodiment of the present invention;
FIG. 3 is an exemplary diagram of a target point within a target polygon according to one embodiment of the present invention;
FIG. 4 is a diagram illustrating an exemplary target point outside the target polygon according to an embodiment of the present invention;
FIG. 5 is a flowchart illustrating a method for calculating a total area of a triangle defined by a target point and a target polygon according to an embodiment of the present invention;
FIG. 6 is a flowchart illustrating a method for determining a position relationship between a target point and a target area according to an embodiment of the present invention;
FIG. 7 is an exemplary diagram of a triangle defined when a target point is inside a target polygon provided by an embodiment of the present invention;
FIG. 8 is an exemplary diagram of a triangle defined when a target point is outside a target polygon provided by an embodiment of the present invention;
FIG. 9 is a functional block diagram of a block chain based location positioning system according to an embodiment of the present invention;
FIG. 10 is a functional block diagram of a computing module according to an embodiment of the present invention;
FIG. 11 is a functional block diagram of a judging module according to an embodiment of the present invention;
FIG. 12 is a schematic diagram of an electronic device implementing a blockchain-based location positioning method according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the invention. Rather, they are merely examples of apparatus and methods consistent with aspects of the invention as detailed in the accompanying claims.
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Furthermore, it is evident that the word "comprising" does not exclude other elements or steps, and that the singular does not exclude a plurality. A plurality of units or means recited in the system claims can also be implemented by means of software or hardware by means of one unit or means. The terms first, second, etc. are used to denote a name, but not any particular order.
The blockchain is a novel application mode of computer technologies such as distributed data storage, point-to-point transmission, consensus mechanism, encryption algorithm and the like. The Blockchain (Blockchain), which is essentially a decentralised database, is a string of data blocks that are generated by cryptographic means in association, each data block containing a batch of information of network transactions for verifying the validity of the information (anti-counterfeiting) and generating the next block. The blockchain may include a blockchain underlying platform, a platform product services layer, an application services layer, and the like.
The embodiment of the invention provides a block chain-based location positioning method, and an execution subject of the block chain-based location positioning method comprises, but is not limited to, at least one of a server, a terminal and the like which can be configured to execute the method provided by the embodiment of the application. In other words, the blockchain-based location positioning method can be performed by software or hardware installed in a terminal device or a server device, and the software can be a blockchain platform. The service end includes but is not limited to: a single server, a server cluster, a cloud server or a cloud server cluster, and the like. The server may be an independent server, or may be a cloud server that provides cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communications, middleware services, domain name services, security services, content delivery networks (ContentDelivery Network, CDN), and basic cloud computing services such as big data and artificial intelligence platforms.
For ease of understanding, embodiments of the present invention are described herein with respect to an EIgamal encryption algorithm. Because of the characteristics of the EIgamal encryption algorithm, there are plaintext data m1 and plaintext Wen Shuju m2, and the encrypted ciphertext data are E (m 1) and E (m 2), the following calculation expression holds:
E(m1)*E(m2)＝E(m1*m2)
the method ensures that the operation result in the ciphertext state is the same as the encryption of the operation result in the plaintext state.
Fig. 1 and fig. 2 are schematic flow diagrams of a block chain-based location positioning method according to an embodiment of the invention. Fig. 2 is a block chain network structure example diagram according to an embodiment of the present invention. As shown in fig. 1, the block chain-based location positioning method includes:
s101, the platform side node converts the target area into a target polygon.
In the embodiment of the invention, the target area is a planned area in location positioning.
As shown in fig. 2, in the embodiment of the present invention, the supervisor node, the client node, and the platform node together form a blockchain network. The supervisor node is not responsible for the operation of the data therein, but only audit and trace the statistical process according to the on-chain data when needed. In the embodiment of the invention, the blockchain network can be constructed by a P2P mode by a user side, a platform side and a supervisor side, and the embodiment of the invention is not particularly limited.
In the embodiment of the present invention, optionally, the platform node may select a polygon inscribed or circumscribed on the target area, and make the area difference between the polygon and the target area lower than a specified threshold, where the specified threshold may be set as required, and the embodiment of the present invention is not specifically limited. The polygon is then taken as the target polygon.
S102, the platform side node acquires vertex plaintext data of the target polygon and the area of the target polygon.
S103, the user terminal node acquires the plaintext data of the target point.
In the embodiment of the invention, the plaintext data of the target point is the position information of the target point where the target user is located.
In the embodiment of the present invention, please refer to fig. 3 and fig. 4, fig. 3 is an exemplary diagram of a target point inside a target polygon provided in the embodiment of the present invention, and fig. 4 is an exemplary diagram of a target point outside a target polygon provided in the embodiment of the present invention. Specifically, assuming that the target polygon BCDEF is a pentagon, the five vertex plaintext data are B (xb, yb), C (xc, yc), D (xd, yd), E (xe, ye), F (xf, yf), wherein B (xb, yb) and C (xc, yc) are adjacent, C (xc, yc) and D (xd, yd) are adjacent, D (xd, yd) and E (xe, ye) are adjacent, E (xe, ye) and F (xf, yf) are adjacent, and F (xf, yf) and B (xb, yb) are adjacent. The target polygon area is S0. The plain text data of the target point a is (xa, ya).
And S104, the supervisor node generates a public key and a private key according to an encryption algorithm.
In the embodiment of the invention, the public key is broadcast to the platform side node and the user side node through the block chain link point, and the private key is held by the supervisor side node.
Specifically, in the embodiment of the present invention, the manner in which the supervisor node generates the public key and the private key according to the encryption algorithm is specifically: the supervisor node generates a public key and a private key according to the EIgamal encryption algorithm.
S105, the user terminal node encrypts the target point plaintext data according to the public key to obtain target point ciphertext data, and broadcasts the target point ciphertext data to the platform terminal node.
In the embodiment of the invention, the user terminal node acquires the public key through the block chain link point and encrypts the target point plaintext data xa and ya by the public key, and the encrypted target point ciphertext data are EXA and EYA. Then the user terminal node broadcasts the target point ciphertext data EXA and EYA to the platform side node through the block chain link point, at the moment, the target point ciphertext data broadcast by the user terminal node is already in a desensitization state, namely an encryption state, and the platform side node does not know plaintext data, so that the privacy protection of the data is realized.
S106, the platform side node encrypts the vertex plaintext data according to the public key to obtain vertex ciphertext data.
For convenience of understanding, in the embodiment of the present invention, the platform node selects B (xb, yb) and C (xc, yc) adjacent to each other in vertex plaintext data for description, and should not limit the present invention. In the embodiment of the invention, the platform side node locally calculates (yb-yc) and (xb-xc), encrypts the (yb-yc) and the (xb-xc) by using a public key broadcasted by the supervisor side node, and obtains vertex ciphertext data E (yb-yc) and E (xb-xc) after encryption.
And S107, the platform side node multiplies the target point ciphertext data and the vertex ciphertext data to obtain reference ciphertext data, and broadcasts the reference ciphertext data to the supervisor side node and the user side node.
In the embodiment of the present invention, in step S107, the manner in which the platform node multiplies the target point ciphertext data and the vertex ciphertext data to obtain the reference ciphertext data is specifically:
the platform side node calculates the target point ciphertext data and the vertex ciphertext data according to the following formula to obtain reference ciphertext data:
Figure SMS_2
where EXA is ciphertext data of the target point A (xa, ya) on the x-axis, EYA is ciphertext data of the target point A (xa, ya) on the y-axis, E (yb-yc) is ciphertext data of a distance difference between adjacent vertices B (xb, yb) and C (xc, yc) of the target polygon on the y-axis, E (xb-xc) is ciphertext data of a distance difference between adjacent vertices B (xb, yb) and C (xc, yc) of the target polygon on the x-axis, and EM1 and EM2 are reference ciphertext data.
It can be understood that the platform side node performs the above operation to obtain the reference ciphertext data EM1 and EM2, and then broadcasts the reference ciphertext data EM1 and EM2 to the supervisor node and the user side node through the blockchain node, where the reference ciphertext data broadcast by the platform side node is already in a desensitization state, that is, an encryption state, and the supervisor node and the user side node do not know the plaintext data, thereby realizing privacy protection on the data.
S108, the supervisor node decrypts the reference ciphertext data according to the private key to obtain reference plaintext data, and broadcasts the reference plaintext data to the platform node.
In the embodiment of the present invention, the supervisor node decrypts the reference ciphertext data EM1 and EM2 according to the private key to obtain the reference plaintext data DM1 and DM2, and then broadcasts the reference plaintext data DM1 and DM2 to the platform node, and the platform node cannot see the plaintext data of the target point a (xa, ya) because EM 1=exa×e (yb-yc) and EM 2=eya×e (xb-xc), thereby realizing privacy protection of the data.
And S109, the platform side node calculates the total area of the triangle defined by the target point and the target polygon according to the reference plaintext data and the vertex plaintext data, and broadcasts the total area and the target polygon area to the user side node.
Specifically, in the embodiment of the present invention, referring to fig. 5, fig. 5 is a flowchart illustrating a process of calculating a total area of a triangle defined by a target point and a target polygon according to the embodiment of the present invention. In step S109, the platform node calculates a total area of the triangle defined by the target point and the target polygon according to the reference plaintext data and the vertex plaintext data, including:
s1091, the platform side node sequentially calculates the area of a triangle defined by the target point and the adjacent vertex of the target polygon based on the reference plaintext data and the vertex plaintext data;
s1092, the platform side node performs addition processing on areas of all triangles defined by the target point and the target polygon to obtain the total area of the triangles defined by the target point and the target polygon.
More specifically, in the embodiment of the present invention, step S1091, the platform side node sequentially calculates an area of a triangle defined by the target point and an adjacent vertex of the target polygon based on the reference plaintext data and the vertex plaintext data, including:
the platform square node calculates the area of the triangle defined by the target point and an adjacent vertex of the target polygon according to the following formula:
S1＝0.5*[DM1-DM2+(xb*yc-xc*yb)]
wherein DM1 is plaintext data obtained by decrypting EM1, DM2 is plaintext data obtained by decrypting EM2, S1 is the area of a triangle defined by a target point A (xa, ya) and adjacent vertexes B (xb, yb) and C (xc, yc) of the target polygon;
The platform square node sequentially calculates the areas of triangles formed by all adjacent vertexes of the target polygon and the target point.
It can be understood that, in the embodiment of the present invention, a triangle surrounded by three points a (xa, ya), B (xb, yb) and C (xc, yc) is obtained according to a triangle area calculation formula: s=0.5 x [ xa (yb-yc) -ya (xb-xc) + (xb yc-xb) ]. Since the characteristics of the EIgamal encryption algorithm ensure that the result of the operation in the ciphertext state is the same as the result of the operation in the plaintext state, i.e., E (m 1) E (m 2) =e (m 1) m 2), thus, EM 1=exa_e (yb-yc) =e [ xa (yb-yc) ], that is, DM 1=xa (yb-yc), and thus s=0.5 ] [ xa (yb-yc) -ya (xb-xc) + (xb yc-xc_yb) ]=0.5 ] [ DM1-DM2+ (xb-yc-xb) ]=s1.
In the embodiment of the invention, the area S1 of the triangle defined by the target point A (xa, ya) and the adjacent vertices B (xb, yb) and C (xc, yc) of the target polygon is calculated by the platform side node, the area S2 of the triangle defined by the target point A (xa, ya) and the adjacent vertices C (xc, yc) and D (xd, yd) of the target polygon is calculated by the platform side node, the area S3 of the triangle defined by the target point A (xa, ya) and the adjacent vertices D (xd, yd) and E (xe, ye) of the target polygon is calculated by the platform side node according to the formula, the area S4 of the triangle defined by the target point A (xa, ya) and the adjacent vertices F (xf, yf) and B (xb), and the area S5 of the triangle defined by the target point A (xa, ya) and the adjacent vertices E (xe, ye) and E (xa, yy) of the target polygon is calculated by the platform side node, and then the total area S1, S2, S4 and S4 of the triangle defined by the target point A (xa, ya) and B (xf, and B) of the target polygon is added together Total (S) . The platform square node then sums the areas S Total (S) And the target polygon area S0 is broadcast to the user end nodes.
S110, the user terminal node judges the position relation between the target point and the target area according to the total area and the target polygon area.
Specifically, referring to fig. 6, fig. 6 is a flow chart illustrating a method for determining a positional relationship between a target point and a target area according to an embodiment of the present invention. In step S110, the determining, by the ue, the positional relationship between the target point and the target area according to the total area and the target polygon area includes:
s1101, the user terminal node judges whether the total area of the triangle is equal to the area of the target polygon; if yes, go to step S1102; if not, executing step S1103;
s1102, the user side section confirms that a target user is positioned in a target area;
s1103, the user side section confirms that the target user is not located in the target area.
In the embodiment of the present invention, please refer to fig. 7 and 8, fig. 7 is an exemplary diagram of a triangle defined by a target point in the interior of a target polygon according to the embodiment of the present invention, and fig. 8 is an exemplary diagram of a triangle defined by a target point in the exterior of a target polygon according to the embodiment of the present invention. It will be appreciated that if the target point A (xa, ya) is within the target polygon BCDEF, then the target point A (xa, ya) is connected to the sum S of all triangle areas formed by the vertices of the target polygon BCDEF Total (S) Equal to the target polygon area S0; if the target A (xa, ya) is outside the target polygon BCDEF, the target point A (xa, ya) is connected with the sum S of all triangle areas formed by the vertices of the target polygon BCDEF Total (S) Not equal to the target polygon area S0. Therefore, in step S1101, the user end node determines the total area S of the triangle Total (S) Whether or not equal to the target polygon area S0; when S is Total (S) When=s0, it is indicated that the target point a (xa, ya) is located within the target polygon BCDEF, i.e., the target user is located within the target area. When S is Total (S) Not equal to S0, it is indicated that the target point a (xa, ya) is not located within the target polygon BCDEF, i.e. the target user is not located within the target area.
In summary, in the embodiment of the present invention, a platform node converts a target area into a target polygon, obtains vertex plaintext data and a target polygon area of the target polygon, a user side node obtains target plaintext data, a supervisor side node generates a public key and a private key according to an encryption algorithm, then the user side node encrypts the target plaintext data according to the public key to obtain target ciphertext data and broadcasts the target ciphertext data to the platform side node, the platform side node encrypts the vertex plaintext data according to the public key to obtain vertex ciphertext data and multiplies the target ciphertext data and the vertex ciphertext data to obtain reference ciphertext data, and broadcasts the reference ciphertext data to the supervisor side node and the user side node, the supervisor side node decrypts the reference ciphertext data according to the private key to obtain reference plaintext data and broadcasts the reference plaintext data to the platform side node, and then the platform side node calculates a total area of a triangle defined by the target point and the target polygon and broadcasts the total area and the target polygon area to the user side node, and the user side node judges a positional relationship with the target area according to the total area and the target polygon area. According to the embodiment of the invention, the data of each party is encrypted and cultured through an encryption algorithm, when the data or a process result is disputed, a supervision party carries out audit and tracing on the statistical process according to the data on the chain, and the supervision party does not hold the data of each party; the data disclosed by each party is in a desensitization state, namely a ciphertext state, any party does not know the plaintext data of other parties, and the plaintext data of each party is not local, so that the problems that the existing zone location positioning cannot carry out privacy protection on the position information of a user, a large amount of user data are leaked if a platform party system is attacked, the plaintext data of the position information of the user are illegally acquired, and the safety is low are solved, the privacy protection on the user travel data is realized, the safety of the user position data is improved, and the risk of user data leakage is reduced.
Referring to FIG. 9, FIG. 9 is a functional block diagram of a block chain based location positioning system according to an embodiment of the present invention. The blockchain-based location positioning system 100 of the present invention can be installed in an electronic device. The blockchain-based location positioning system 100 may include a conversion module 101, a first acquisition module 102, a second acquisition module 103, a key module 104, a first encryption module 105, a second encryption module 106, an operation module 107, a decryption module 108, a calculation module 109, and a judgment module 110 according to the implemented functions. The module of the invention, which may also be referred to as a unit, refers to a series of computer program segments, which are stored in the memory of the electronic device, capable of being executed by the processor of the electronic device and of performing a fixed function.
In the embodiment of the present invention, the functions of each module/unit are as follows:
a conversion module 101, configured to convert the target area into a target polygon through the platform node; wherein the target area is a planned area in location positioning;
a first obtaining module 102, configured to obtain vertex plaintext data of a target polygon and an area of the target polygon through a node of a platform side;
A second obtaining module 103, configured to obtain plaintext data of a target point through a user end node; the target point plaintext data is the position information of the target point where the target user is located;
a key module 104, configured to generate, by the supervisor node, a public key and a private key according to an encryption algorithm; the public key is broadcast to the platform side node and the user side node through the block chain link point, and the private key is held by the supervisor side node;
the first encryption module 105 is configured to encrypt target point plaintext data according to a public key through a user end node to obtain target point ciphertext data, and broadcast the target point ciphertext data to a platform side node;
the second encryption module 106 is configured to encrypt vertex plaintext data according to a public key through a platform node to obtain vertex ciphertext data;
the operation module 107 is configured to perform a multiplication operation on the target point ciphertext data and the vertex ciphertext data through the platform node to obtain reference ciphertext data, and broadcast the reference ciphertext data to the supervisor node and the user node;
the decryption module 108 is configured to decrypt the reference ciphertext data according to the private key by the supervisor node to obtain reference plaintext data, and broadcast the reference plaintext data to the platform node;
A calculation module 109, configured to calculate, by the platform node, a total area of the triangle defined by the target point and the target polygon according to the reference plaintext data and the vertex plaintext data, and broadcast the total area and the target polygon area to the user end node;
the judging module 110 is configured to judge, by the user end node, a positional relationship between the target point and the target area according to the total area and the target polygon area.
Specifically, referring to fig. 10, fig. 10 is a functional block diagram of a computing module according to an embodiment of the invention. As shown in fig. 10, the calculation module 109 includes:
a first calculation submodule 1091, configured to sequentially calculate, by the platform side node, an area of a triangle defined by the target point and an adjacent vertex of the target polygon based on the reference plaintext data and the vertex plaintext data;
the second calculation submodule 1092 is configured to add the areas of all triangles defined by the target point and the target polygon through the platform node, so as to obtain a total area of the triangles defined by the target point and the target polygon.
Specifically, referring to fig. 11, fig. 11 is a functional block diagram of a determination module according to an embodiment of the present invention. As shown in fig. 11, the judging module 110 includes:
A judging submodule 1101, configured to judge, by using a user end node, whether the total area of the triangle is equal to the target polygon area;
a first confirmation submodule 1102, configured to confirm, by the user end node, that the target user is located in the target area when the determination submodule 1101 determines that the total area of the triangle is equal to the target polygon area by the user end node;
the second confirmation sub-module 1103 is configured to confirm, by the user end node, that the target user is not located in the target area when the determination sub-module 1101 determines that the total area of the triangle is not equal to the target polygon area by the user end node.
In detail, each module in the blockchain-based location positioning system 100 in the embodiment of the present invention adopts the same technical means as the blockchain-based location positioning method described in fig. 1 to 8, and can produce the same technical effects, which are not described herein.
Referring to fig. 12, fig. 12 is a schematic structural diagram of an electronic device for implementing a location positioning method based on a blockchain according to an embodiment of the invention.
The electronic device 1 may include a processor 10, a memory 11, a communication bus 12, and a communication interface 13, and may also include computer programs stored in the memory 11 and executable on the processor 10, such as a blockchain-based location positioning program.
The processor 10 may be formed by an integrated circuit in some embodiments, for example, a single packaged integrated circuit, or may be formed by a plurality of integrated circuits packaged with the same function or different functions, including one or more central processing units (Central Processing unit, CPU), a microprocessor, a digital processing chip, a graphics processor, a combination of various control chips, and so on. The processor 10 is a control unit (control unit) of the electronic device, connects various components of the entire electronic device using various interfaces and lines, and executes various functions of the electronic device and processes data by running or executing programs or modules stored in the memory 11 (e.g., executing a block chain-based location positioning program, etc.), and calling data stored in the memory 11.
The memory 11 includes at least one type of readable storage medium including flash memory, a removable hard disk, a multimedia card, a card type memory (e.g., SD or DX memory, etc.), a magnetic memory, a magnetic disk, an optical disk, etc. The memory 11 may in some embodiments be an internal storage unit of the electronic device, such as a mobile hard disk of the electronic device. The memory 11 may in other embodiments also be an external storage device of the electronic device, such as a plug-in mobile hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card) or the like, which are provided on the electronic device. Further, the memory 11 may also include both an internal storage unit and an external storage device of the electronic device. The memory 11 may be used to store not only application software installed on an electronic device and various types of data, such as codes of a multi-blockchain-based location positioning program, but also temporarily store data that has been output or is to be output.
The communication bus 12 may be a peripheral component interconnect standard (peripheral componentinterconnect, PCI) bus, or an extended industry standard architecture (extended industry standardarchitecture, EISA) bus, among others. The bus may be classified as an address bus, a data bus, a control bus, etc. The bus is arranged to enable a connection communication between the memory 11 and at least one processor 10 etc.
The communication interface 13 is used for communication between the electronic device 1 and other devices, including a network interface and a user interface. Optionally, the network interface may include a wired interface and/or a wireless interface (e.g., WI-FI interface, bluetooth interface, etc.), typically used to establish a communication connection between the electronic device and other electronic devices. The user interface may be a Display (Display), an input unit such as a Keyboard (Keyboard), or alternatively a standard wired interface, a wireless interface. Alternatively, in some embodiments, the display may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, an OLED (Organic Light-Emitting Diode) touch, or the like. The display may also be referred to as a display screen or display unit, as appropriate, for displaying information processed in the electronic device 1 and for displaying a visual user interface.
Fig. 12 shows only an electronic device with components, and it will be understood by those skilled in the art that the structure shown in fig. 12 is not limiting of the electronic device 1 and may include fewer or more components than shown, or may combine certain components, or a different arrangement of components.
For example, although not shown, the electronic device 1 may further include a power source (such as a battery) for supplying power to each component, and preferably, the power source may be logically connected to the at least one processor 10 through a power management device, so that functions of charge management, discharge management, power consumption management, and the like are implemented through the power management device. The power supply may also include one or more of any of a direct current or alternating current power supply, recharging device, power failure detection circuit, power converter or inverter, power status indicator, etc. The electronic device may further include various sensors, bluetooth modules, wi-Fi modules, etc., which are not described herein.
It should be understood that the embodiments described are for illustrative purposes only and are not limited to this configuration in the scope of the patent application.
The blockchain-based location positioning program stored by the memory 11 in the electronic device 1 is a combination of instructions that, when executed in the processor 10, can implement:
The platform square node converts a target area into a target polygon, and acquires vertex plaintext data of the target polygon and the area of the target polygon; the target area is a planned area in positioning the location; carrying out
The user terminal node acquires plaintext data of a target point; the plaintext data of the target point is the position information of the target point where the target user is located;
the supervisor node generates a public key and a private key according to an encryption algorithm; the public key is broadcast to the platform side node and the user side node through a block chain link point, and the private key is held by the supervisor side node;
the user terminal node encrypts the target point plaintext data according to the public key to obtain target point ciphertext data, and broadcasts the target point ciphertext data to the platform side node;
the platform side node encrypts the vertex plaintext data according to the public key to obtain vertex ciphertext data, multiplies the target point ciphertext data and the vertex ciphertext data to obtain reference ciphertext data, and broadcasts the reference ciphertext data to the supervisor side node and the user side node;
the supervisor node decrypts the reference ciphertext data according to the private key to obtain reference plaintext data, and broadcasts the reference plaintext data to the platform node;
The platform side node calculates the total area of the triangle defined by the target point and the target polygon according to the reference plaintext data and the vertex plaintext data, and broadcasts the total area and the target polygon area to the user side node;
and the user terminal node judges the position relation between the target point and the target area according to the total area and the target polygon area.
In particular, the specific implementation method of the above instructions by the processor 10 may refer to the description of the relevant steps in the corresponding embodiment of the drawings, which is not repeated herein.
Further, the modules/units integrated in the electronic device 1 may be stored in a computer readable storage medium if implemented in the form of software functional units and sold or used as separate products. The computer readable storage medium may be volatile or nonvolatile. For example, the computer readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM).
The present invention also provides a computer readable storage medium storing a computer program which, when executed by a processor of an electronic device, can implement:
the platform square node converts a target area into a target polygon, and acquires vertex plaintext data of the target polygon and the area of the target polygon; the target area is a planned area in positioning the location; carrying out
The user terminal node acquires plaintext data of a target point; the plaintext data of the target point is the position information of the target point where the target user is located;
the supervisor node generates a public key and a private key according to an encryption algorithm; the public key is broadcast to the platform side node and the user side node through a block chain link point, and the private key is held by the supervisor side node;
the user terminal node encrypts the target point plaintext data according to the public key to obtain target point ciphertext data, and broadcasts the target point ciphertext data to the platform side node;
the platform side node encrypts the vertex plaintext data according to the public key to obtain vertex ciphertext data, multiplies the target point ciphertext data and the vertex ciphertext data to obtain reference ciphertext data, and broadcasts the reference ciphertext data to the supervisor side node and the user side node;
The supervisor node decrypts the reference ciphertext data according to the private key to obtain reference plaintext data, and broadcasts the reference plaintext data to the platform node;
the platform side node calculates the total area of the triangle defined by the target point and the target polygon according to the reference plaintext data and the vertex plaintext data, and broadcasts the total area and the target polygon area to the user side node;
and the user terminal node judges the position relation between the target point and the target area according to the total area and the target polygon area.
In the several embodiments provided in the present invention, it should be understood that the disclosed apparatus, device and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the modules is merely a logical function division, and there may be other manners of division when actually implemented.
The modules described as separate components may or may not be physically separate, and components shown as modules may or may not be physical units, may be located in one place, or may be distributed over multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional module in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units can be realized in a form of hardware or a form of hardware and a form of software functional modules.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.
The present embodiments are, therefore, to be considered as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference signs in the claims shall not be construed as limiting the claim concerned.
It should be understood that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and that although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention.

Claims (10)

1. A blockchain-based location positioning method, wherein the blockchain includes a supervisor node, a platform node, and a user end node, the method comprising:
the platform square node converts a target area into a target polygon, and acquires vertex plaintext data of the target polygon and the area of the target polygon; the target area is a planned area in positioning the location;
the user terminal node acquires plaintext data of a target point; the plaintext data of the target point is the position information of the target point where the target user is located;
the supervisor node generates a public key and a private key according to an encryption algorithm; the public key is broadcast to the platform side node and the user side node through a block chain link point, and the private key is held by the supervisor side node;
the user terminal node encrypts the target point plaintext data according to the public key to obtain target point ciphertext data, and broadcasts the target point ciphertext data to the platform side node;
the platform side node encrypts the vertex plaintext data according to the public key to obtain vertex ciphertext data, multiplies the target point ciphertext data and the vertex ciphertext data to obtain reference ciphertext data, and broadcasts the reference ciphertext data to the supervisor side node and the user side node;
The supervisor node decrypts the reference ciphertext data according to the private key to obtain reference plaintext data, and broadcasts the reference plaintext data to the platform node;
the platform side node calculates the total area of the triangle defined by the target point and the target polygon according to the reference plaintext data and the vertex plaintext data, and broadcasts the total area and the target polygon area to the user side node;
and the user terminal node judges the position relation between the target point and the target area according to the total area and the target polygon area.
2. The blockchain-based location positioning method of claim 1, wherein the manner in which the supervisor node generates the public key and the private key according to the encryption algorithm is specifically:
and the supervisor node generates a public key and a private key according to the EIgamal encryption algorithm.
3. The location positioning method based on blockchain as in claim 1, wherein the manner that the platform node multiplies the target point ciphertext data and the vertex ciphertext data to obtain reference ciphertext data is specifically as follows:
the platform side node calculates the target point ciphertext data and the vertex ciphertext data according to the following formula to obtain reference ciphertext data:
Figure FDA0003982720520000021
Where EXA is ciphertext data of the target point A (xa, ya) on the x-axis, EYA is ciphertext data of the target point A (xa, ya) on the y-axis, E (yb-yc) is ciphertext data of a distance difference between adjacent vertices B (xb, yb) and C (xc, yc) of the target polygon on the y-axis, E (xb-xc) is ciphertext data of a distance difference between adjacent vertices B (xb, yb) and C (xc, yc) of the target polygon on the x-axis, and EM1 and EM2 are reference ciphertext data.
4. The blockchain-based location positioning method of claim 3, wherein the platform side node calculates a total area of a triangle defined by the target point and the target polygon from the reference plaintext data and the vertex plaintext data, comprising:
the platform side node sequentially calculates the area of a triangle defined by the target point and the adjacent vertex of the target polygon based on the reference plaintext data and the vertex plaintext data;
and the platform square node performs addition processing on the areas of all triangles defined by the target point and the target polygon to obtain the total area of the triangles defined by the target point and the target polygon.
5. The blockchain-based location positioning method of claim 4, wherein the platform side node sequentially calculates an area of a triangle defined by the target point and adjacent vertices of the target polygon based on the reference plaintext data and the vertex plaintext data, comprising:
The platform square node calculates the area of a triangle defined by the target point and an adjacent vertex of the target polygon according to the following formula:
S1＝0.5*[DM1-DM2+(xb*yc-xc*yb)]
wherein DM1 is plaintext data obtained by decrypting EM1, DM2 is plaintext data obtained by decrypting EM2, S1 is the area of a triangle defined by a target point and adjacent vertexes B (xb, yb) and C (xc, yc) of the target polygon;
and the platform square node sequentially calculates the areas of triangles formed by all adjacent vertexes of the target polygon and the target point.
6. The blockchain-based location positioning method of claim 5, wherein the user end node determining the positional relationship of the target point and the target area according to the total area and the target polygon area comprises:
the user terminal node judges whether the total area is equal to the target polygonal area or not;
if the total area is equal to the target polygon area, the user end section confirms that the target user is located in the target area;
and if the total area is not equal to the target polygonal area, the user end section confirms that the target user is not located in the target area.
7. The blockchain-based location positioning method of claim 1, wherein the manner in which the platform side node converts the target area into the target polygon is specifically:
and selecting a polygon to be inscribed or circumscribed on the target area by the platform square node, enabling the area difference between the polygon and the target area to be lower than a specified threshold value, and taking the polygon as a target polygon.
8. A blockchain-based location positioning system, wherein the blockchain includes a supervisor node, a platform side node, and a user side node, the system comprising:
the conversion module is used for converting the target area into a target polygon through the platform square node; the target area is a planned area in positioning the location;
the first acquisition module is used for acquiring vertex plaintext data of the target polygon and the area of the target polygon through the platform square node;
the second acquisition module is used for acquiring plaintext data of a target point through the user terminal node; the plaintext data of the target point is the position information of the target point where the target user is located;
the key module is used for generating a public key and a private key according to an encryption algorithm through the supervisor node; the public key is broadcast to the platform side node and the user side node through a block chain link point, and the private key is held by the supervisor side node;
The first encryption module is used for encrypting the target point plaintext data according to the public key through the user terminal node to obtain target point ciphertext data, and broadcasting the target point ciphertext data to the platform side node;
the second encryption module is used for encrypting the vertex plaintext data according to the public key through the platform side node to obtain vertex ciphertext data;
the operation module is used for carrying out multiplication operation on the target point ciphertext data and the vertex ciphertext data through the platform side node to obtain reference ciphertext data, and broadcasting the reference ciphertext data to the supervisor side node and the user side node;
the decryption module is used for decrypting the reference ciphertext data according to the private key through the supervisor node to obtain reference plaintext data, and broadcasting the reference plaintext data to the platform side node;
the calculation module is used for calculating the total area of the triangle defined by the target point and the target polygon according to the reference plaintext data and the vertex plaintext data through the platform side node, and broadcasting the total area and the target polygon area to the user side node;
And the judging module is used for judging the position relation between the target point and the target area according to the total area and the target polygon area through the user terminal node.
9. An electronic device, the electronic device comprising:
at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the blockchain-based location positioning method as recited in any of claims 1-7.
10. A computer readable storage medium storing a computer program which when executed by a processor implements a blockchain-based location positioning method as recited in any of claims 1 to 7.
CN202211556925.5A 2022-12-06 2022-12-06 Block chain-based zone bit positioning method, system, equipment and storage medium Pending CN116226270A (en)

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