KR20200026627A - Online vote method using block chain and apparatus therefor - Google Patents

Abstract

The present invention relates to an online voting method and a device therefor for increasing the reliability and security using a blockchain. According to an embodiment of the present invention, a method for conducting online voting using a blockchain in a voting management server comprises the steps of: generating a private key and a public key for voting; distributing the public key to a terminal of a voter and storing marked information encrypted with the public key in a blockchain; monitoring whether a voting period is over and, when it is finished, releasing the private key; and decrypting a plurality of pieces of vote information stored in the blockchain using the private key to perform vote counting.

Description

Online vote method using block chain and apparatus therefor}

The present invention relates to an online voting method, and more particularly, to an online voting method and apparatus for improving reliability and security using a blockchain.

Voting refers to the act of expressing intentions when selecting candidates or when deciding whether to vote on an agenda. These votes are usually held anonymously, sometimes called the flower of democracy. In general, voting is done by marking each participant's intention on a verified ballot at a place that has been promised for a period of time. .

This off-line voting method requires a lot of labor and time, and in recent years, the online voting method has been carried out.

However, through the online voting system, when voting proceeds, there is a problem that it is difficult to secure reliability due to hacking, internal operation, and the like. In addition, when the online voting proceeds, the voter's voting behavior may be exposed due to cheating such as monitoring of the central server, and there is a risk that the voting intermediate result may be aggregated in real time even when the voting is not completed.

Accordingly, there is a need for an online voting technology that guarantees security, integrity and reliability.

The present invention has been proposed to solve the problems of the online voting system, an online voting method using a blockchain that prevents tampering of the voting data from external operations, and secures the integrity and reliability of the voting results and processes, and The object is to provide a device for this purpose.

Other objects and advantages of the present invention can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. Also, it will be readily appreciated that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

According to a first aspect of the present invention for achieving the above object, a method for performing online voting using a blockchain in the voting management server, the method comprising: generating a private key and a public key for voting; Distributing the public key to a terminal of a voter and storing the voting information encrypted with the public key in a blockchain; Monitoring whether or not the voting period is over, and if so, disclosing the private key; And deciphering a plurality of voting information stored in the blockchain using the private key to perform voting counting.

According to a second aspect of the present invention for achieving the above object, a program included in a communication device generates a private key and a public key for voting, distributes the public key to a terminal of a voter, and encrypts it with the public key. A key management unit for encouraging the registered voting information to be stored in the blockchain and monitoring whether or not the voting period is ended, and releasing the private key when the voting period is finished; And a voting counting unit for decrypting a plurality of voting information stored in the blockchain using the private key.

The present invention has an advantage of ensuring the integrity and reliability of data by storing voting related data (ie, voting transactions) using a blockchain.

In addition, the present invention allows the voting information to be encrypted through a dedicated public key used at the time of voting, and by not releasing a private key that can decrypt the voting information until the end of the voting, the voting result can be counted in the middle. It is effective to prevent the situation in advance.

In addition, the present invention has the advantage of increasing the reliability of the voting results by distributing the private key to the voter terminals, allowing each terminal to jointly count the voting results.

In addition, the present invention by using a randomly selected image, by generating a private key and public key, and also concealed the storage location of the private key, there is an effect that can reliably prevent the voting operation that may occur due to the leakage of the private key have.

The following drawings attached to this specification are illustrative of the preferred embodiments of the present invention, and together with the specific details for carrying out the invention serve to further understand the technical spirit of the present invention, the present invention described in such drawings It should not be construed as limited to matters.
1 is a diagram showing the configuration of an online voting system according to an embodiment of the present invention.
2 is a diagram illustrating a configuration of a voting management server 100 according to an embodiment of the present invention.
3 is a diagram showing the configuration of a voting management system according to an embodiment of the present invention.
4 is a flowchart illustrating a method of performing a preliminary work for online voting in an online voting system according to an embodiment of the present invention.
FIG. 5 is a flowchart illustrating a method in which online voting is performed and counted in an online voting system according to an embodiment of the present invention.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, whereby those skilled in the art may easily implement the technical idea of the present invention. There will be. In addition, in describing the present invention, when it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram showing the configuration of an online voting system according to an embodiment of the present invention.

As shown in FIG. 1, an online voting system according to an embodiment of the present invention includes a voting management server 100, a plurality of voter terminals 200, an election management terminal 300, and a blockchain network 400. Thus, the respective components communicate with each other via the communication network 500. The communication network 500 includes a mobile communication network, a satellite communication network and a broadband wired communication network.

The election management terminal 300 manages an election and is a terminal owned by an administrator and starts online voting in conjunction with the voting management server 100. The election management terminal 300 may transmit the voting period and the election data including the candidates to the voting management server 100 to proceed with voting. In addition, the election management terminal 300 may transmit a list of voting rights in which a plurality of voting rights issued to each voter terminal 200 is recorded, to the voting management server 100. The election management terminal 300 may authenticate each voter terminal 200, and may grant a vote right to the voter terminal 200 having successfully authenticated. One-time (ie, only one time) coin can be adopted as the voting right, and in this case, the voter terminal 200 can use the coin to participate in the online voting. The election management terminal 300 stores a list of voters, and based on the list of voters, the voter may authenticate a voter and issue a vote right to the voter terminal 200 having successfully authenticated. On the other hand, the election management terminal 300 receives the private key from the voting management server 100 when the voting ends. The private key is used to decrypt the encrypted markup information stored in the blockchain.

The voter terminal 200 is a terminal owned by voters participating in the voting. If voter authentication succeeds, the voter terminal 200 receives a voting right from the election management terminal 300. In addition, the voter terminal 200 may access the voting management server 100 in a designated voting period by using the voting rights and perform online voting. The voter terminal 200 receives the voting-only public key from the voting management server 100 before performing the voting, encrypts the voting information for the voting with the public key, and transmits it to the voting management server 100 online. You may vote.

In addition, the voter terminal 200 receives a private key from the voting management server 100 when the voting ends, decrypts a plurality of ticket information stored in the blockchain using the private key, and then decrypts the decrypted ticket information. Based on the vote counting can proceed with the other terminal.

The election management terminal 300 and the voter terminal 200 include a desktop computer, a tablet computer, a mobile communication terminal, a wall pad, and the like, and any device capable of communicating through the communication network 500 can be adopted without limitation. Also, each of the election management terminal 300 and the voter terminal 200 may be equipped with a program for online voting.

The blockchain network 400 is connected to a plurality of nodes and may perform verification on a transaction. That is, each node belonging to the blockchain network 400 performs a verification on this voting transaction when a voting transaction occurs. At this time, the nodes belonging to the blockchain network 400 may verify the authenticity of the electronic signature. In addition, each node included in the blockchain network 300 shares a blockchain that includes a voting transaction and has a connection structure between blocks.

The blocks that make up the blockchain are composed of block headers and transactions. The block header contains the previous block hash value, Markle Root, Nonce, and timestamp. The previous block hash represents a hash reference value for the previous block (ie, the parent block) in the blockchain structure. Mercut is the hash to the Merkle tree root. The time stamp records the generation time of the block. In the transaction (i.e., voting transaction), voting right information and encrypted voting information are recorded. The announcement information may include candidate selection information, and may also include pros or cons. In addition, a transaction (i.e., a voting initiation transaction or a voting end transaction) may record data informing the initiation of the voting or end of the voting.

The voting management server 100 is a communication device that manages online voting. The voting management server 100 generates and manages a private key and a public key and manages the progress of the online voting.

2 is a diagram illustrating a configuration of a voting management server 100 according to an embodiment of the present invention.

The voting management server 100 according to FIG. 2 includes a memory 110, a memory controller 121, one or more processors (CPUs) 122, a peripheral interface 123, an input / output (I / O) subsystem 130, The display device 141 includes an input device 142 and a communication circuit 150. These components communicate via one or more communication buses or signal lines. The various components shown in FIG. 2 may be implemented in hardware, software or a combination of both hardware and software, including one or more signal processing and / or application specific integrated circuits.

The memory 110 may include high speed random access memory, and may also include one or more magnetic disk storage devices, nonvolatile memory such as flash memory devices, or other nonvolatile semiconductor memory devices. In some embodiments, memory 110 is a storage device located remote from one or more processors 122, such as communication circuitry 150, the Internet, an intranet, a local area network (LAN), and a wide area network (WLAN). Network attached storage devices that are accessed through a communication network, such as a storage area network (SAN), or any suitable combination thereof. Access to memory 110 by other components of voting management server 100, such as processor 122 and peripheral interface 123, may be controlled by memory controller 121.

The peripheral interface 123 connects the input / output peripheral of the device with the processor 122 and the memory 110. One or more processors 122 execute a set of instructions stored in various software programs and / or memory 110 to perform various functions for the voting management server 100 and to process data.

In some embodiments, peripheral interface 123, processor 122, and memory controller 121 may be implemented on a single chip, such as chip 120. In some other embodiments, they may be implemented in separate chips.

I / O subsystem 130 provides an interface between the input and output peripherals of voting management server 100, such as display device 141, input device 142, and peripheral interface 123.

The display device 141 may use a liquid crystal display (LCD) technology, a light emitting polymer display (LPD) technology, or a light emitting diode (LED) technology, and the display device 141 may be a capacitive type, a resistive type, an infrared type, or the like. It may be a touch display of. The touch display provides an output interface and an input interface between the device and the user. The touch display presents visual output to the user. The visual output may include text, graphics, video, and combinations thereof. Some or all of the visual output may correspond to user interface objects. The touch display forms a touch sensitive surface that accepts user input.

The input device 142 is an input means such as a keypad, a keyboard, a mouse, and the like, and receives an input signal of a user.

Processor 122 is a processor configured to perform operations associated with voting management server 100 and to perform instructions, for example, input between components of voting management server 100 using instructions retrieved from memory 110. And reception and manipulation of output data.

The communication circuit 150 transmits and receives wireless electromagnetic waves through an antenna or transmits and receives data through a wired cable. The communication circuit 150 converts an electrical signal into an electromagnetic wave and vice versa and can communicate with the communication network, another mobile gateway device, and the communication device through the electromagnetic wave. Communication circuit 150 includes, but is not limited to, for example, an antenna system, an RF transceiver, one or more amplifiers, tuners, one or more oscillators, digital signal processors, CODEC chipsets, subscriber identity module (SIM) cards, memory, and the like. It may include, but is not limited to, known circuitry for performing these functions. The communication circuit 150 may be via a wired or wireless network such as the Internet, an intranet and network and / or a mobile communication network, a wireless LAN and / or a metropolitan area network (MAN), called the World Wide Web (WWW). Communicate with other devices.

An operating system 111, a graphics module (instruction set) 112, and an authentication program (instruction set) 113, which are software components, are mounted (installed) in the memory 110.

The operating system 111 may be, for example, a built-in operating system such as Darwin, RTXC, LINUX, UNIX, OS X, WINDOWS, VxWorks, Tizen, IOS or Android, and may be a general system task (e.g., For example, various software components and / or devices for controlling and managing memory management, storage device control, power management, and the like may be included.

Graphics module 112 includes various well-known software components for presenting and displaying graphics on display device 141. The term "graphic" includes all objects that can be displayed to the user, including, without limitation, text, web pages, key buttons, digital images, videos, animations, and the like.

The voting management program 113 is a program for executing and managing online voting. The voting management program 113 propagates voting transactions to the blockchain network 400 and generates a private key and a public key dedicated to voting.

3 is a diagram illustrating a configuration of a voting management system according to an embodiment of the present invention.

As shown in FIG. 3, the voting management program 113 according to an embodiment of the present invention includes an election data acquisition unit 31, an image selection unit 32, a key management unit 33, and a transaction propagation unit 34. And a vote counting unit 35.

The election data acquisition unit 31 obtains the election data including the voting period, the voter list, and the candidate information (or the vote / ban information) from the election management terminal 300. The voter list includes information (eg, social security number, mobile phone number, email address or login ID) for identifying the voter.

The image selecting unit 32 selects an image that is the basis for generating the private key and the public key. The image selector 32 may search for an image using an arbitrary search term and then select any one of the searched images. In this case, the image selecting unit 32 may select a search word corresponding to a specific rank (for example, 9 rank) from the current search ranking, and randomly select any image among the images searched through the search term.

The key manager 33 generates a private key and a public key for voting. The generated private key and public key are prohibited from being reused when the voting ends. That is, the key manager 33 generates different private and public keys for each vote. The key manager 33 may select a specific image through the image selector 32 and select a private key and a public key by using the image as a seed. At this time, the key manager 33 may convert the hexa code of the selected image into a number, and input the number as a seed to a key generation algorithm to generate a private key and a public key.

In addition, the key manager 33 stores the generated private key in a hidden form in the memory 110, and distributes the public key to the voter terminal 200 and the election management terminal 300 each having the right to vote. At this time, the key manager 33 obfuscates and stores the private key storage address in the memory 110 without being known to anyone. There is no standard for obfuscation, and the private keys are not stored in succession, but are separated by character units and stored in different address locations on the memory, so that the private key cannot be leaked even by a memory dump. After that, when the voting period ends, the key management unit 33 releases the private key concealed in the memory 110 and distributes the private key to each of the voter terminal 200 and the election management terminal 300.

The transaction propagation unit 34 performs a function of propagating the voting transaction to the blockchain network 400. Specifically, when the transaction propagation unit 34 receives encrypted voting information from the voter terminal 200, the transaction propagation unit 34 authenticates whether the voter terminal 200 is a terminal having a voting right, and the voter terminal 200 performs a duplicate voting. Authenticate whether or not In addition, the transaction propagation unit 34, upon successful authentication, generates a voting transaction including the right to vote of the voter terminal 200 and the encrypted voting information, and propagates the voting transaction to the blockchain network 400 to block the voting transaction. Can be stored in In addition, the transaction propagation unit 34 may propagate the voting start transaction or the voting end transaction to the blockchain network 400.

When the voting period 35 ends, the voting period 35 approaches the blockchain network 400, extracts a plurality of voting transactions, decrypts the voting information included in each voting transaction with a private key, and then decrypts the decrypted voting information. Check the election results by counting.

Meanwhile, the voting management program 113 may be mounted in a cloud computing system, in which case the election data acquisition unit 31, the image selection unit 32, the key management unit 33, the transaction propagation unit 34, and the voting aggregate The unit 35 may be operated in a cloud computing system in the form of a virtual machine.

4 is a flowchart illustrating a method of performing a preliminary work for online voting in an online voting system according to an embodiment of the present invention.

Referring to FIG. 4, the election management terminal 300 identifies the voters participating in the online voting, and transmits an email, a text message, or a mail to guide the online voting to induce the online voting. Then, the voter terminal 200, which is a terminal owned by the voter, accesses the election management terminal 300 and requests the right to vote online vote (S401).

Then, the election management terminal 300 requests the identity authentication data to the voter terminal 200, and performs the voter's identity authentication based on the identity authentication data (S403). At this time, the election management terminal 300 may receive the electronic signature for identity verification from the voter terminal 200, and verify the authenticity of the electronic signature, thereby performing voter identification.

Next, the election management terminal 300 issues voting rights to the voter terminal 200 that succeeded in verifying the voter's identity (S405). In this case, the election management terminal 300 may issue an online coin used to vote as a vote right to the voter terminal 200.

When the right to vote or issuance is issued to each voter terminal 200 as described above, the election management terminal 300 is an election including a vote period, a plurality of voter information (that is, voter list) and candidate information that can participate in an election. The data is transmitted to the voting management server 100 to request the online voting progress to the voting management server 100 (S407). In addition, the election management terminal 300 may additionally transmit to the vote management server 100 a list of voting rights in which voting rights (eg, coin identification information) issued to each voter terminal 200 are recorded.

Then, the election data acquisition unit 31 of the voting management server 100 receives and stores the election data and the voting right list, and the key management unit 33 receives a new election proceeding as the election data is received. It is requested from 300). The key manager 33 requests the image selector 32 to select an image, and the image selector 32 searches for an image using an arbitrary search term, and then selects one of the searched images. S409). In this case, the image selecting unit 32 may select a search word corresponding to a rank set in advance in the real-time search ranking, and randomly select any image among the images searched through the search term.

Next, the key manager 33 generates an exclusive private key and public key for the corresponding vote using the image selected by the image selector 32 (S411). At this time, the key manager 33 may convert the hexadecimal code of the selected image into a number, and input the number into the key generation algorithm as a seed to generate a private key and a public key.

Next, the key manager 33 stores the generated private key in a hidden form in the memory 110 and distributes the public key to each of the voter terminals 200 with reference to the voter list (S413). At this time, the key manager 33 secretly stores the private key storage address in the memory 110 without being disclosed to anyone. On the other hand, the key management unit 33 may distribute the generated public key to the election management terminal 300.

The transaction propagation unit 34 checks the voting period, the candidates and the voters in the election management data, and generates a voting initiation transaction including the voting period, the candidates, the voters, and the generated public key. 400) (S415, S417). At this time, the transaction propagation unit 34 performs an electronic signature with the private key (ie, the electronic signature private key) of the voting management server 100, and transmits the electronic signature to the blockchain network 400 together with the voting initiation transaction. It can spread. Here, the private key is not a decryption private key used to decrypt the voting information but another private key used for signature, and the private key used to decrypt the voting information is not exposed to anyone before the end of the voting.

Subsequently, each node of the blockchain network 400 verifies the authenticity of the electronic signature, and if the digital signature verification succeeds, stores the voting initiation transaction in the blockchain (S419).

FIG. 5 is a flowchart illustrating a method in which online voting is performed and counted in an online voting system according to an embodiment of the present invention.

Referring to FIG. 5, the voter terminal 200 uses the voting rights issued from the election management terminal 300, and either votes in one of the candidates, or votes in favor or disagree with the agenda, and then the candidate. The ballot information or the ballot and ballot information is encrypted with the public key received from the voting management server 100 (S501). Next, the voter terminal 200 transmits the encrypted vote information to the vote management server 100 (S503).

Then, the transaction propagation unit 34 of the voting management server 100 verifies whether the vote of the voter terminal 200 is a legitimate vote by verifying whether the voter of the voter and the duplicate vote (S505). At this time, the transaction propagation unit 34 verifies whether the voting right received from the voter terminal 200 has already been used, and verifies whether the voting right is a normal voting right. That is, the transaction propagation unit 34 approaches the blockchain network 400, compares the voting rights stored in the blockchain with the voting rights received from the voter terminal 200, and the voting rights received from the voter terminal 200 are determined. By checking whether it is already stored in the blockchain, it is possible to verify whether the voting right has already been used. In addition, the transaction propagation unit 34 of the voting management server 100 checks the list of voting rights received from the election management terminal 300, compares the list of voting rights with the voting rights received from the voter terminal 200, and voters. It is possible to verify whether the voting right received from the terminal 200 is a normally issued voting right.

When the transaction propagation unit 34 succeeds in voting verification, the transaction propagation unit 34 generates a voting transaction including the encrypted voting information and the voting rights, propagates the voting transaction to the blockchain network 400, and includes the voting transaction. The new block is stored in the blockchain (S507, S509). At this time, the transaction propagation unit 34 may further propagate the electronic signature signed with the private key of the voting management server 100 to the blockchain network 400, in which case each node included in the blockchain network 400 When the authenticity of the electronic signature is verified and the electronic signature verification is successful, a new block including the voting transaction is generated and the new block is connected with the existing block, thereby storing the voting transaction in the blockchain.

Through this procedure, voter information voted by each voter terminal 200 is encrypted with a public key, recorded in a voting transaction, and stored in a blockchain.

The key management unit 33 of the voting management server 100 monitors whether the voting period ends, and when the voting period ends, extracts the private key hidden in the memory 110 (S511 and S513). The key manager 33 distributes the private key to each of the election management terminal 300 and the voter terminal 200 (S515 and S517).

In addition, when the voting period ends, the transaction propagation unit 34 generates a voting end transaction including the voting period, the candidates, the number of voters, the public key, and the private key, and transfers the voting end transaction to the blockchain network 400. It can also propagate. In this case, each node of the blockchain network 400 generates a new block including the voting end transaction, connects the new block with an existing block, and stores it in the blockchain.

Next, the ballot counting unit 35 of the voting management server 100 accesses the blockchain network 400 to obtain a plurality of voting transactions stored in the blockchain, and stores the voting information encrypted and stored in the plurality of transactions. Decrypt using the private key. And the vote counting unit 35 analyzes the decrypted voting information, and counts the voting results (S519).

Similarly, each of the election management terminal 300 and the voter terminal 200 confirms the private key received from the voting management server 100, accesses the blockchain network 400, and extracts a plurality of voting transactions, respectively. After decrypting the voting information included in the voting transaction with the private key, the decrypted voting information is collected to confirm the election result (S521, S523).

When the voting period ends, the plurality of terminals and the server decode the voting information by using the jointly distributed private key to aggregate the voting results, thereby ensuring transparency and reliability in the voting counting process.

Meanwhile, in the above-described embodiment, the voting transaction is generated by the voting management server 100 and described as being propagated to the blockchain network 400. However, the present invention is not limited thereto, and the voting transaction itself is performed by the voter terminal 200. It may be generated and propagated to the blockchain network 400. That is, in another embodiment, the voter terminal 200 encrypts the voting information with the public key issued by the voting management server 200, and then generates a voting transaction including its own voting rights and the encrypted voting information, and thereby blocks the chain. It may propagate to the network 400. In this case, each node of the blockchain network 400 may first authenticate whether or not the voting right is a voting right issued by the election management terminal 300 by interworking with the election management terminal 300. By comparing each identification information of the stored voting rights and the identification information of the voting rights received from the voter terminal 200, it can be secondarily verified whether the voting rights have already been used. When the blockchain network 400 succeeds in the first and second verifications, the blockchain network 400 generates a new block including the voting transaction received from the voter terminal 200 and connects the new block with the existing block to the blockchain. .

While this specification contains many features, such features should not be construed as limiting the scope of the invention or the claims. Also, the features described in the individual embodiments herein can be implemented in combination in a single embodiment. Conversely, various features described in a single embodiment herein can be implemented individually in various embodiments or in combination appropriately.

Although the operations are described in a particular order in the drawings, they should not be understood as being performed in a particular order as shown, or in a sequence of successive orders, or all described actions being performed to obtain a desired result. . Multitasking and parallel processing may be advantageous in certain circumstances. In addition, it should be understood that the division of various system components in the above-described embodiments does not require such division in all embodiments. The program components and systems described above may generally be packaged in a single software product or multiple software products.

As described above, the method of the present invention may be implemented as a program and stored in a recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.) in a computer-readable form. Since this process can be easily carried out by those skilled in the art will not be described in more detail.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited by the drawings.

100: voting management server 110: memory
111: operating system 112: graphics module
113: Voting Management Program 121: Memory Controller
122: CPU 123: peripheral interface
130: I / O subsystem 141: display device
142: input device 150: communication circuit
200: voter terminal 300: election management terminal
400: blockchain network 500: communication network
31: election data acquisition unit 32: image selection unit
33: key management unit 34: transaction propagation unit
35: vote counting unit

Claims (10)

As a method of voting online using a blockchain in a voting management server,
Generating a private key and a public key for voting;
Distributing the public key to a terminal of a voter and storing the voting information encrypted with the public key in a blockchain;
Monitoring whether or not the voting period is over, and if so, disclosing the private key; And
And voting by decrypting a plurality of voting information stored in the blockchain using the private key. The method of claim 1,
The storing of the voting information in the blockchain,
If the vote is performed in a voter terminal, receiving the vote information encrypted with the public key from the voter terminal; And
Propagating the transaction including the encrypted voting information to a blockchain network, and storing the encrypted voting information on a blockchain. The method of claim 2,
Receiving a voting right from the voter terminal, comparing the voting right with a list of voting rights received from an election management terminal, and first verifying whether the voting right is a voting right issued by the election management terminal; And
And secondly verifying whether the vote has already been used;
The storing of the voting information in the blockchain may include storing the encrypted voting information in the blockchain when the first verification and the second verification are successful. The method of claim 1,
Generating the private key and the public key,
Selecting an arbitrary image and using the image as a seed to generate the private key and the public key. The method of claim 4, wherein
Generating the private key and the public key,
Checking a real-time search ranking and checking a search word corresponding to a preset ranking in the real-time search ranking;
Searching for an image using the identified search word and randomly selecting any one of the searched images; And
Generating the private key and the public key using the selected image as a seed. One or more processors;
Memory; And
A communication device comprising one or more programs stored in the memory and configured to be executed by the one or more processors,
The program,
Generates a private key and public key for voting, distributes the public key to the terminal of the voter, induces the voting information encrypted with the public key to be stored in the blockchain, and monitors whether the voting period is over and ends. A key manager for publishing the private key; And
And a ballot counting unit for decrypting a plurality of ballot information stored in the blockchain by using the private key. The method of claim 6,
When the voting is performed in the voter terminal, the voting information encrypted with the public key is received from the voter terminal, a transaction including the encrypted voting information is propagated to the blockchain network, and the encrypted voting information is stored in the blockchain. And a transaction propagation unit. The method of claim 7, wherein
The transaction propagation unit,
Receive voting rights from the voter terminal, compare the voting rights with the list of voting rights received from the election management terminal, first verify whether the voting rights are the voting rights issued by the election management terminal, and the voting rights have already been used. And after the second verification whether the first verification and the second verification succeed, storing the encrypted voting information in the blockchain. The method of claim 6,
Further comprising; an image selecting unit for selecting a random image,
And the key manager generates the private key and the public key using the selected image as a seed. The method of claim 9,
The image selection unit,
And confirming a real-time search ranking, searching for an image using a search word corresponding to a preset ranking in the real-time search ranking, and randomly selecting any one of the searched images.

Images