KR102471210B1 - Method and system for data analysis service mediation based on blockchain and homomorphic encryption - Google Patents

Abstract

The present invention relates to a data analysis service mediation system and method based on blockchain and homomorphic encryption. The system comprises: a user terminal for selecting one analysis service provider from among one or more analysis service providers and providing homomorphically encrypted data together with an analysis request; at least one analysis service provider terminal for registering a type of an analysis service that can be provided and providing an analysis result of the homomorphically encrypted data to the user terminal; and an analysis service mediation server for receiving and providing a type of at least one or more analysis service providers to the user terminal and mediating a smart contract between the user terminal and the selected analysis service provider based on the analysis request and the homomorphically encrypted data. The present invention provides an analysis service without leaking sensitive personal information to the outside and can mediate various analysis services and analysis service companies that a user needs.

Description

Data analysis service mediation system and method based on block chain and homomorphic encryption

The present invention relates to a data analysis service brokerage system and method based on block chain and homomorphic encryption. It relates to a system and method for mediating a user and a data analysis service provider.

Due to technological developments such as biotechnology, artificial intelligence, and fintech, an environment is being created in which personalized analysis services can be received on personal health or economic problems. At the same time, various encryption technologies exist to safely store or process sensitive personal information. However, most of the encryption techniques are techniques for safely encrypting/decrypting the original data so that a third party cannot easily decrypt it.

Meanwhile, the homomorphic encryption technology conceived by mathematicians in the 1970s was practically implemented in 2009 by Stanford University scientist Craig Gentry. Homomorphic encryption technology is a data implementation of the principle that “it is like a box containing gloves used to handle toxic chemicals, and all operations are performed inside the box, so the chemicals are never exposed to the outside world.” It is an encryption technology designed to perform calculations directly on encrypted data (ciphertext). In other words, it is a technology in which a third party processes or analyzes encrypted data and returns the result to the data owner without viewing the original data as plain text, and the data owner decrypts and checks the result.

However, there is no service using such homomorphic encryption technology to date.

Registered Patent Publication No. 10-1964254 (registration date: March 26, 2019) Registered Patent Publication No. 10-2024694 (registration date: September 18, 2019)

The present invention has been made to improve the above problems, and the present invention provides a data analysis service mediation system based on block chain and homomorphic encryption that can receive analysis services without leaking sensitive personal information to the outside. There is a task.

In addition, according to an embodiment of the present invention, there is a problem in mediating various analysis services required by users and analysis service companies.

In order to achieve the above object, the data analysis service mediation system based on block chain and homomorphic encryption according to an embodiment of the present invention selects one analysis service provider from among at least one analysis service provider and performs analysis request and a user terminal providing homomorphically encrypted data together; at least one analysis service provider terminal registering a type of analysis service that can be provided and providing an analysis result for the homomorphically encrypted data to the user terminal; And an analysis service mediation server that receives the type of at least one or more analysis service providers, provides them to the user terminal, and mediates a smart contract between the user terminal and the selected analysis service provider based on the analysis request and the homomorphically encrypted data. can include

The analysis service mediation server includes a service information storage unit for storing the at least one or more analysis service providers and types of analysis services that can be provided; an application providing unit providing a dedicated application for homomorphic encryption to the user terminal; an analysis request receiving unit for providing a list of the at least one analysis service provider to the user terminal, receiving the analysis request and homomorphically encrypted data, and transmitting the homomorphically encrypted data to the selected analysis service provider terminal; and a smart contract providing unit generating the smart contract based on the analysis request and distributing the smart contract to a blockchain network.

The homomorphic encrypted data may be data encrypted by some homomorphic encryption (SHE) based on a lattice encryption algorithm.

The homomorphically encrypted data may be data encrypted by Fully Homomorphic Encryption (FHE) based on a lattice encryption algorithm.

The at least one analysis service provider terminal may provide at least one analysis service among medical analysis, financial analysis, legal analysis, and machine learning-based analysis service.

The smart contract providing unit generates the smart contract in which the wallet address, analysis cost, and contract execution conditions of the user and the selected analysis service provider are set, and distributes the smart contract to a blockchain network, and the user terminal and the selected analysis service provider terminal and, when the user terminal receives the analysis result, the contract execution condition completion signal may be generated and transmitted to the smart contract.

The user terminal may generate a private key and the homomorphically encrypted data based on a library environment dedicated to homomorphic encryption provided by the dedicated application, and decrypt the received analysis result with the private key.

Data analysis service mediation method based on block chain and homomorphic encryption according to another embodiment of the present invention is an analysis service registration that stores the types of analysis services that can be provided from at least one analysis service provider terminal by an analysis service mediation server. step; An application providing step of providing a dedicated application for homomorphic encryption to a user terminal by the analysis service mediation server; an analysis service provider display step of providing a list of the at least one analysis service provider to the user terminal by the analysis service mediation server; a request acceptance step of receiving an analysis request and homomorphically encrypted data from the user terminal by the analysis service mediation server; A smart contract creation step of generating, by the analysis service mediation server, a smart contract based on the analysis request, distributing it to a blockchain network, and transmitting the homomorphically encrypted data to the analysis service provider terminal; An electronic signature step in which the user terminal and the selected analysis service provider terminal respectively perform digital signatures on the smart contract; an analysis result providing step in which the selected analysis service provider terminal generates an analysis result for the homomorphically encrypted data and provides it to the user terminal; a contract execution step of generating and transmitting a contract execution condition completion signal to the smart contract when the user terminal receives the analysis result; and decoding and verifying the analysis result by the user terminal.

The homomorphically encrypted data may be data encrypted by Somewhat Homomorphic Encryption (SHE) or Fully Homomorphic Encryption (FHE) based on a lattice encryption algorithm.

Before the step of receiving the request, the step of generating, by the user terminal, a private key and the homomorphically encrypted data based on a library environment dedicated to homomorphic encryption provided in the dedicated application, wherein the user terminal receives the analysis result. In the step of decrypting and confirming, the received analysis result is decrypted with the private key, and in the step of generating a smart contract, the analysis service brokerage server determines that the wallet address, analysis cost, and contract execution conditions of the user and the selected analysis service provider are The set smart contract can be created and distributed.

A data analysis service mediation system based on block chain and homomorphic encryption according to an embodiment of the present invention can provide analysis services without leaking sensitive personal information to the outside.

In addition, an embodiment of the present invention can mediate various analysis services required by users and analysis service companies.

1 is a diagram schematically showing a data analysis service mediation system based on a block chain and homomorphic encryption according to an embodiment of the present invention.
Figure 2 is a block diagram showing the components of the analysis service mediation server according to an embodiment of the present invention.
3 is a flowchart illustrating a data analysis service mediation method based on block chain and homomorphic encryption according to an embodiment of the present invention.

The present invention as described above will be described in detail through the accompanying drawings and embodiments.

It should be noted that technical terms used in the present invention are only used to describe specific embodiments and are not intended to limit the present invention. In addition, technical terms used in the present invention should be interpreted in terms commonly understood by those of ordinary skill in the art to which the present invention belongs, unless specifically defined otherwise in the present invention, and are excessively inclusive. It should not be interpreted in a positive sense or in an excessively reduced sense. In addition, when the technical terms used in the present invention are erroneous technical terms that do not accurately express the spirit of the present invention, they should be replaced with technical terms that those skilled in the art can correctly understand. In addition, general terms used in the present invention should be interpreted as defined in advance or according to context, and should not be interpreted in an excessively reduced sense.

Also, singular expressions used in the present invention include plural expressions unless the context clearly dictates otherwise. In the present invention, terms such as "consisting of" or "comprising" should not be construed as necessarily including all of the various elements or steps described in the invention, and some of the elements or steps are included. It should be construed that it may not be, or may further include additional components or steps.

In addition, terms including ordinal numbers such as first and second used in the present invention may be used to describe components, but components should not be limited by the terms. Terms are used only to distinguish one component from another. For example, a first element may be termed a second element, and similarly, a second element may be termed a first element, without departing from the scope of the present invention.

Hereinafter, a preferred embodiment according to the present invention will be described in detail with reference to the accompanying drawings, but the same or similar components are assigned the same reference numerals regardless of reference numerals, and redundant description thereof will be omitted.

In addition, in describing the present invention, if it is determined that a detailed description of a related known technology may obscure the gist of the present invention, the detailed description will be omitted. In addition, it should be noted that the accompanying drawings are only for easily understanding the spirit of the present invention, and should not be construed as limiting the spirit of the present invention by the accompanying drawings.

1 is a diagram schematically showing a data analysis service mediation system based on block chain and homomorphic encryption according to an embodiment of the present invention, and FIG. 2 is a diagram showing components of an analysis service mediation server according to an embodiment of the present invention. 3 is a flowchart showing a data analysis service mediation method based on block chain and homomorphic encryption according to an embodiment of the present invention.

Hereinafter, a data analysis service mediation system 100 based on a block chain and homomorphic encryption according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

The data analysis service mediation system 100 based on blockchain and homomorphic encryption according to an embodiment of the present invention includes an analysis service mediation server 200, a user terminal 300, an analysis service provider terminal 400, and a blockchain network. It may be implemented in the form of 500.

The analysis service mediation server 200 serves to mediate a user and at least one analysis service provider. To this end, the analysis service mediation server provides a dedicated application for homomorphic encryption to the user terminal 300 . Here, a dedicated application for homomorphic encryption may be installed in the user terminal 300 and may include a homomorphic encryption library for supporting homomorphic encryption of personal data that the user wants to receive analysis services from. As an example of a library that supports such homomorphic encryption, Microsoft SEAL library supporting BFV and CKKS (approximate homomorphic encryption) schemes, MIT's PALISADE library supporting homomorphic encryption schemes such as BGV, BFV, CKKS, TFHE and FHEW, IBM's HElib library supporting CKKS and BGV, fixed HeaAn library that implements the CKKS scheme supporting decimal point approximation arithmetic, Haskell library for ring-based lattice encryption, cuHE and CUFHE library, which are high-speed homomorphic encryption libraries through GPU developed by WPI, NFLlib library developed by Sorbonne in Europe, and KU There are TFHE library, a TFHE scheme support library developed by Leuven, and Lattigo, a multi-user library developed by EPFL.

Here, personal data or data refers to data that a user wants to receive an analysis service for. Examples of such data may include personal sensitive information such as genetic information, medical information, financial information, shopping information, educational background information, and photo information of the user.

The analysis service mediation server 200 communicates with the user terminal 300, the analysis service provider terminal 400, and the blockchain network 500 to exchange information or data with each other and is responsible for data analysis service mediation. This analysis service mediation server 200 has the same configuration as a conventional web server in terms of hardware, and in terms of software, it is implemented through various types of languages such as C, C++, Java, Visual Basic, Visual C, etc. It may include program modules that perform functions. In addition, it is provided in various ways depending on the operating system such as DOS, Windows, Linux, Unix, Macintosh, Android, and iOS in general server hardware. It can be implemented using a web server program that is being developed.

When the user terminal 300 executes the dedicated application to perform homomorphic encryption on personal data, a private key is issued and homomorphic encryption on the data is performed using the private key, and the homomorphically encrypted data and the A private key may be stored in the user terminal 300 . That is, the user terminal 300 may perform homomorphic encryption on data with a private key issued through a dedicated application and decrypt an analysis result received later with the private key. Here, the analysis result means processed data generated by the analysis service provider terminal 400 performing analysis service on the homomorphically encrypted data. The processed data, that is, the analysis result, is decrypted with a private key in the user terminal 300 so that the user can check it.

The analysis service mediation server 200 receives at least one type of analysis service, provides the user terminal 300 with it, and receives an analysis request and homomorphic encrypted data from the user terminal 300 . At least one analysis service provider may provide various types of analysis services such as medical analysis, financial analysis, legal analysis, and machine learning-based analysis service, and the at least one analysis service provider terminal 400 may provide homomorphically encrypted data. It can be configured to enable calculation for . At least one analysis service provider terminal 400 may register the type of analysis service that can be performed with the analysis service mediation server 200 . The analysis service mediation server 200 stores the type of analysis service that can be provided registered from the at least one analysis service provider terminal 400 in a storage means such as a database, and when there is a request from the user terminal 300, Analysis service providers and types of analysis services that can be provided may be provided to the user terminal 300 in the form of a list or a list. In addition, the analysis service mediation server 200 analyzes the type of analysis service that can be provided from at least one analysis service provider terminal 400, analysis cost, service execution period, analysis item, cryptocurrency wallet address for payment processing, etc. Service-related information may be additionally received and stored, and may be provided to the user terminal 300 along with an analysis service provider and a type of analysis service that can be provided.

Upon receiving the analysis request and the homomorphically encrypted data from the user terminal 300, the analysis service mediation server 200 mediates a smart contract between the user terminal 300 and the selected analysis service provider. Here, the analysis request may include the analysis service provider selected by the user, the type of analysis service, and the user's cryptocurrency wallet address for payment. The analysis service mediation server 200 first transmits the homomorphically encrypted data to the selected analysis service provider terminal 400, and is set based on the received analysis request, the wallet address of the selected analysis service provider, analysis cost, and contract execution conditions. A smart contract can be created and deployed to the blockchain network 500. At this time, the smart contract can be created as a multi-signature wallet. Here, the contract execution condition may mean that the analysis result generated by performing the analysis service in the analysis service provider terminal 400 is provided to the user terminal 300 . When the user terminal 300 receives the analysis result, a contract execution condition completion signal may be generated and transmitted to the smart contract. Here, the block chain network 500 may be a public block chain network 500 such as Ethereum capable of distributing and executing smart contracts, or a private block chain network such as an open source based hyperledger fabric for enterprises (500 ) may be

The user terminal 300 may receive at least one or more analysis service providers from the analysis service mediation server 200 . To this end, the user terminal 300 may download and install a dedicated application provided by the analysis service mediation server 200 . The user terminal 300 may execute the dedicated application, receive analysis service providers and types of analysis services that can be provided in the form of a list or list, and display them on a display. When a user selects a specific analysis service provider, he or she can check detailed information on the analysis service provided by the analysis service provider. Detailed information on such analysis service includes analysis cost, service execution period, analysis items, and payment processing It may include a cryptocurrency wallet address, etc.

Such a user terminal 300 is a smartphone (smartphone), smart pad (smartpad), tablet PC (Tablet PC), PCS (Personal Communication System), GSM (Global System for Mobile communications), PDC (Personal Digital Cellular), PHS (Personal Handyphone System), PDA (Personal Digital Assistant), IMT (International Mobile Telecommunication)-2000, CDMA (Code Division Multiple Access)-2000, W-CDMA (W-Code Division Multiple Access), Wibro (Wireless Broadband Internet) It covers wireless communication devices that users can carry, such as terminals, and portable computing devices such as stationary PCs and laptops.

When the user terminal 300 selects a desired analysis service provider and transmits an analysis request, the user terminal 300 performs homomorphic encryption on the data of the user who wants to receive the analysis service. That is, when the user terminal 300 performs homomorphic encryption on personal data through a dedicated application, a private key is issued and homomorphic encryption on the data is performed using the private key, and the homomorphically encrypted data and the A private key may be stored in the user terminal 300 .

The user terminal 300 may also provide homomorphically encrypted data when providing an analysis request to a selected analysis service provider. At this time, the analysis request and the homomorphically encrypted data are transmitted to the analysis service brokerage server 200 . Here, the analysis request may include the analysis service provider selected by the user, the type of analysis service, and the user's cryptocurrency wallet address for payment.

The user terminal 300 may perform homomorphic encryption on data owned by an individual. The user terminal 300 may be configured to receive and install a dedicated application for homomorphic encryption provided from the analysis service mediation server 200 . Here, a dedicated application for homomorphic encryption may be loaded with a homomorphic encryption library for supporting homomorphic encryption of personal data that the user wants to receive analysis services from. Examples of libraries that support such homomorphic encryption include the Microsoft SEAL library, which supports BFV and approximate homomorphic encryption (CKKS) schemes, MIT's PALISADE library, which supports homomorphic encryption schemes such as BGV, BFV, CKKS, TFHE, and FHEW, and CKKS. and IBM's HElib library supporting BGV, HeaAn library implementing the CKKS scheme supporting fixed-point approximation arithmetic, Haskell library for ring-based lattice encryption, cuHE and CUFHE libraries developed by WPI, which are libraries for accelerating homomorphic encryption through GPU. , the NFLlib library developed by Sorbonne in Europe, the TFHE scheme support library developed by KU Leuven, and the multi-user library Lattigo developed by EPFL.

The homomorphically encrypted data may be encrypted based on a lattice encryption algorithm. The data analysis service brokerage system 100 according to an embodiment of the present invention generates homomorphic encrypted data using any one of the lattice encryption algorithms of NTRU, SS-NTRU, BLISS, New Hope, NTRU prime, and LWE-Frodo. It is possible to support the various homomorphic encryption libraries described above so that Homomorphic encrypted data may be data encrypted with some homomorphic encryption (SHE) based on a lattice encryption algorithm. Alternatively, the homomorphically encrypted data may be data encrypted by Fully Homomorphic Encryption (FHE) based on a lattice encryption algorithm.

There are three types of homomorphic encryption: Partially Homomorphic Encryption (PHE), Somewhat Homomorphic Encryption (SHE), and Fully Homomorphic Encryption (FHE). Partially Homomorphic Encryption (PHE) allows only one type of mathematical operation for an unlimited amount of time on a given data set. Slight Homomorphic Encryption (SHE) is more permissive than Partial Homomorphic Encryption (PHE), but still restrictive, allowing only a few additions and multiplications for a given data set. Fully Homomorphic Encryption (FHE) allows various types of operations on a data set without limit. Therefore, some homomorphic encryption (SHE) or full homomorphic encryption (FHE) can be applied depending on the type of analysis service.

The user terminal 300 may perform an electronic signature on the smart contract distributed in the blockchain network 500. Regardless of the order, the user terminal 300 or the service provider terminal can perform a digital signature on the distributed smart contract, and the smart contract can be created as a multi-signature wallet, and the quantum or analysis service brokerage server 200 It can be configured to enable a third party's electronic signature including.

After performing the digital signature, the user terminal 300 may receive an analysis result for the homomorphically encrypted data from the analysis service provider terminal 400 . The user terminal 300 may decrypt the analysis result using a private key provided by the dedicated application. Through this, the user can know the analysis result for the desired data by checking the decrypted analysis result.

Upon receiving the analysis result, the user terminal 300 may generate a contract execution condition completion signal and transmit it to the smart contract. When the smart contract receives the contract execution condition completion signal, the user terminal 300 performs the electronic signature on the smart contract, and the pre-deposited cryptocurrency corresponding to the value of the analysis cost is the cryptocurrency of the analysis service provider terminal 400. The contract is completed by sending it to the wallet address and paying the fee.

The analysis service provider terminal 400 may register the types of analysis services that can be provided with the analysis service mediation server 200 . In addition, the analysis service provider terminal 400 may additionally provide information related to the analysis service, such as analysis cost, service execution period, analysis item, cryptocurrency wallet address for payment processing, to the analysis service brokerage server 200. can

The analysis service provider terminal 400 may perform an analysis service by receiving homomorphically encrypted data from the analysis service mediation server 200 . for teeth, The analysis service provider terminal 400 may be a computing device capable of processing and performing data at a level capable of analyzing data for service provision. That is, the analysis service provider terminal 400 may be configured to enable operations on homomorphically encrypted data.

The analysis service provider terminal 400 may provide at least one analysis service among medical analysis, financial analysis, legal analysis, and machine learning-based analysis service.

The analysis service provider terminal 400 may perform an electronic signature on the smart contract distributed by the analysis service mediation server 200. Regardless of the order, the user terminal 300 or the service provider terminal can perform a digital signature on the distributed smart contract, and the smart contract can be created as a multi-signature wallet, and the quantum or analysis service brokerage server 200 It can be configured to enable a third party's electronic signature including.

The blockchain network 500 is It can be a public blockchain network 500, such as Ethereum, where smart contracts can be deployed and executed, or a private blockchain network 500, such as an open source based Hyperledger Fabric for enterprises.

An example of network communication connecting the analysis service mediation server 200, the user terminal 300, the analysis service provider terminal 400, and the blockchain network 500 according to this embodiment is the technical standards for mobile communication Or communication method (eg, GSM (Global System for Mobile communication), CDMA (Code Division Multi Access), CDMA2000 (Code Division Multi Access 2000), EV-DO (Enhanced Voice-Data Optimized or Enhanced Voice-Data Only) , WCDMA (Wideband CDMA), HSDPA (High Speed Downlink Packet Access), HSUPA (High Speed Uplink Packet Access), LTE (Long Term Evolution), LTE-A (Long Term Evolution-Advanced), 5G, etc.) It may include a mobile communication network, but is not particularly limited. In addition, an example of the wired communication network may be a closed network such as a local area network (LAN) and a wide area network (WAN), preferably an open network such as the Internet. The Internet is based on the TCP/IP protocol and several services that exist on its upper layer, such as HTTP (HyperText Transfer Protocol), Telnet, FTP (File Transfer Protocol), DNS (Domain Name System), SMTP (Simple Mail Transfer Protocol), SNMP ( Simple Network Management Protocol), Network File Service (NFS), and Network Information Service (NIS).

The analysis service mediation server 200 may include a service information storage unit 210, an application providing unit 220, an analysis request receiving unit 230, and a smart contract providing unit 240.

The service information storage unit 210 may store the one or more analysis service providers and types of analysis services that can be provided. The service information storage unit 210 may store the types of available analysis services registered by the at least one analysis service provider terminal 400 in a storage means such as a database.

The application provider 220 may provide a dedicated application for homomorphic encryption to the user terminal 300 . Here, a dedicated application for homomorphic encryption may be installed in the user terminal 300 and may include a homomorphic encryption library for supporting homomorphic encryption of personal data that the user wants to receive analysis services from. As an example of a library that supports such homomorphic encryption, Microsoft SEAL library supporting BFV and CKKS (approximate homomorphic encryption) schemes, MIT's PALISADE library supporting homomorphic encryption schemes such as BGV, BFV, CKKS, TFHE and FHEW, IBM's HElib library supporting CKKS and BGV, fixed HeaAn library that implements the CKKS scheme supporting decimal point approximation arithmetic, Haskell library for ring-based lattice encryption, cuHE and CUFHE library, which are high-speed homomorphic encryption libraries through GPU developed by WPI, NFLlib library developed by Sorbonne in Europe, and KU There are TFHE library, a TFHE scheme support library developed by Leuven, and Lattigo, a multi-user library developed by EPFL.

The analysis request receiving unit 230 provides a list of the at least one analysis service provider to the user terminal 300, receives the analysis request and homomorphically encrypted data, and transfers the homomorphically encrypted data to the selected analysis service provider. It can be transmitted to the terminal 400. Upon receiving a request from the user terminal 300, the analysis request receiving unit 230 may provide the user terminal 300 with an analysis service provider and a type of analysis service that can be provided in the form of a list or a list. In addition, the analysis request reception unit 230 provides analysis services such as analysis cost, service execution period, analysis item, cryptocurrency wallet address for payment processing, together with the types of analysis services that can be provided from at least one analysis service provider terminal 400. Information related to may be additionally received and stored, and may be provided to the user terminal 300 along with an analysis service provider and a type of analysis service that can be provided. The analysis request receiving unit 230 may transmit the homomorphically encrypted data to the selected analysis service provider terminal 400 .

The smart contract provider 240 may generate the smart contract based on the analysis request and distribute it to the blockchain network 500. More specifically, the smart contract providing unit 240 may generate the smart contract in which the wallet address of the user and the selected analysis service provider, analysis cost, and contract execution conditions are set, and distribute it to the blockchain network 500.

The smart contract provider 240 may request an audit of the smart contract in conjunction with an external smart contract audit agency server before creating the smart contract and distributing it to the blockchain network 500. Smart contracts are executed irreversibly when specified conditions are executed, and it is difficult to reverse if there is a problem with the code stored on the smart contract or a logical error. It can be audited for potential problems or vulnerabilities in the contract. If a problem is found as a result of the external smart contract audit agency server auditing the smart contract, it can transmit the problem and the proposed solution to the smart contract provider 240. When the smart contract providing unit 240 receives the problem of the smart contract and the proposed solution, it can modify the smart contract based on the proposed solution and distribute it to the blockchain network 500.

Referring to FIG. 3, a data analysis service mediation method based on blockchain and homomorphic encryption according to another embodiment of the present invention includes an analysis service registration step, an application provision step, an analysis service provider display step, a request acceptance step, and a smart contract. It may include a generation step, a digital signature step, an analysis result providing step, a contract execution step, and an analysis result decryption step.

In the analysis service registration step, the analysis service mediation server 200 may store types of analysis services that can be provided from at least one analysis service provider terminal 400 . In this step, the analysis service brokerage server 200 determines the analysis cost, service performance period, analysis item, cryptocurrency for payment processing together with the type of analysis service registered from the at least one analysis service provider terminal 400. Information related to the analysis service, such as a wallet address, may be stored in a storage means such as a database.

In the application providing step, a dedicated application for homomorphic encryption may be provided to the user terminal 300 by the analysis service mediation server 200 . Here, a dedicated application for homomorphic encryption may be installed in the user terminal 300 and may include a homomorphic encryption library for supporting homomorphic encryption of personal data that the user wants to receive analysis services from. As an example of a library that supports such homomorphic encryption, Microsoft SEAL library supporting BFV and CKKS (approximate homomorphic encryption) schemes, MIT's PALISADE library supporting homomorphic encryption schemes such as BGV, BFV, CKKS, TFHE and FHEW, IBM's HElib library supporting CKKS and BGV, fixed HeaAn library that implements the CKKS scheme supporting decimal point approximation arithmetic, Haskell library for ring-based lattice encryption, cuHE and CUFHE library, which are high-speed homomorphic encryption libraries through GPU developed by WPI, NFLlib library developed by Sorbonne in Europe, and KU There are TFHE library, a TFHE scheme support library developed by Leuven, and Lattigo, a multi-user library developed by EPFL.

Here, personal data or data refers to data that a user wants to receive an analysis service for. Examples of such data may include personal sensitive information such as genetic information, medical information, financial information, shopping information, educational background information, and photo information of the user.

In the analysis service provider display step, the analysis service mediation server 200 may provide a list of at least one analysis service provider to the user terminal 300 . When there is a request from the user terminal 300, the analysis service brokerage server 200 may provide analysis service providers and types of analysis services that can be provided to the user terminal 300 in the form of a list or a list. In addition, the analysis service mediation server 200 analyzes the type of analysis service that can be provided from at least one analysis service provider terminal 400, analysis cost, service execution period, analysis item, cryptocurrency wallet address for payment processing, etc. You may provide additional information related to the service.

In the request receiving step, the analysis service mediation server 200 may receive an analysis request and homomorphically encrypted data from the user terminal 300 . Here, the analysis request may include the analysis service provider selected by the user, the type of analysis service, and the user's cryptocurrency wallet address for payment.

In the smart contract creation step, a smart contract is created based on the analysis request and homomorphically encrypted data, distributed to the blockchain network 500, and the homomorphically encrypted data can be transmitted to the analysis service provider terminal 400. . To this end, the analysis service mediation server 200 first transmits the homomorphically encrypted data to the selected analysis service provider terminal 400, and based on the received analysis request, the wallet address of the selected analysis service provider, analysis cost, and contract execution conditions. A smart contract set to can be created and distributed to the blockchain network (500). At this time, the smart contract can be created as a multi-signature wallet. Here, the contract execution condition may mean that the analysis result generated by performing the analysis service in the analysis service provider terminal 400 is provided to the user terminal 300 .

In the electronic signature step, the user terminal 300 and the selected analysis service provider terminal 400 may each perform an electronic signature on the smart contract.

In the analysis result providing step, the selected analysis service provider terminal 400 may generate an analysis result for the homomorphically encrypted data and provide it to the user terminal 300 .

In the contract execution step, when the user terminal 300 receives the analysis result, a contract execution condition completion signal may be generated and transmitted to the smart contract.

In the analysis result decoding step, the user terminal 300 may decode the analysis result. Here, the analysis result means processed data generated by the analysis service provider terminal 400 performing analysis service on the homomorphically encrypted data. The processed data, that is, the analysis result, is decrypted with a private key in the user terminal 300 so that the user can check it.

Before the request acceptance step, the user terminal 300 may further include generating a private key and the homomorphically encrypted data based on a library environment dedicated to homomorphic encryption provided by the dedicated application.

In the analysis result decoding step, the user terminal 300 may decrypt and check the received analysis result with the private key.

In the smart contract creation step, the analysis service brokerage server 200 may generate and distribute the smart contract in which the wallet address, analysis cost, and contract execution conditions of the user and the selected analysis service provider are set.

Here, the homomorphically encrypted data may be data encrypted by Somewhat Homomorphic Encryption (SHE) or Fully Homomorphic Encryption (FHE) based on a lattice encryption algorithm.

In the above, preferred embodiments according to the present invention have been shown and described. However, the present invention is not limited to the above-described embodiments, and various modifications can be made by anyone having ordinary knowledge in the technical field to which the present invention belongs without departing from the gist of the present invention appended within the scope of the claims. .

100: data analysis service mediation system
200: analysis service brokerage server
210: service information storage unit
220: application providing unit
230: Analysis request reception department
240: smart contract provision unit
300: user terminal
400: analysis service provider terminal
500: blockchain network

Claims (10)

a user terminal selecting one analysis service provider from among one or more analysis service providers and providing homomorphically encrypted data together with an analysis request;
at least one analysis service provider terminal registering a type of analysis service that can be provided and providing an analysis result for the homomorphically encrypted data to the user terminal; and
An analysis service mediation server that receives and provides the at least one type of analysis service to the user terminal, and mediates a smart contract between the user terminal and a selected analysis service provider based on the analysis request and homomorphically encrypted data.
including,
The analysis service brokerage server
a service information storage unit for storing the at least one analysis service provider and types of analysis services that can be provided;
an application providing unit providing a dedicated application for homomorphic encryption to the user terminal;
an analysis request receiving unit for providing a list of the at least one analysis service provider to the user terminal, receiving the analysis request and homomorphically encrypted data, and transmitting the homomorphically encrypted data to the selected analysis service provider terminal; and
A smart contract providing unit that creates the smart contract based on the analysis request and distributes it to the blockchain network
Including,
The smart contract provider
Before distributing the smart contract to the blockchain network, request an audit of the smart contract to an external smart contract audit agency server linked in advance, and from the external smart contract audit agency server, the smart contract problem and proposed When receiving a solution, a data analysis service brokerage system based on blockchain and homomorphic encryption that modifies the smart contract based on the proposed solution and distributes it to the blockchain network. delete According to claim 1,
The homomorphic encrypted data is data encrypted with some homomorphic encryption (Somewhat Homomorphic Encryption, SHE) based on a lattice encryption algorithm, a data analysis service brokerage system based on block chain and homomorphic encryption. According to claim 1,
The homomorphic encrypted data is data encrypted with Fully Homomorphic Encryption (FHE) based on a lattice encryption algorithm, data analysis service brokerage system based on block chain and homomorphic encryption. According to claim 1,
The at least one analysis service provider terminal is a data analysis service mediation system based on blockchain and homomorphic encryption providing at least one analysis service of medical analysis, financial analysis, legal analysis, and machine learning-based analysis service. According to claim 1,
The smart contract provider
Create and distribute the smart contract in which the wallet address, analysis cost, and contract execution conditions of the user and the selected analysis service provider are set, and distributed to the blockchain network;
The user terminal and the selected analysis service provider terminal each perform a digital signature on the smart contract,
When the user terminal receives the analysis result, the data analysis service brokerage system based on block chain and homomorphic encryption for generating the contract execution condition completion signal and transmitting it to the smart contract. According to claim 6,
The user terminal
Brokerage of data analysis service based on block chain and homomorphic encryption that generates a private key and the homomorphically encrypted data based on a library environment dedicated to homomorphic encryption provided by the dedicated application and decrypts the received analysis result with the private key system. An analysis service registration step of storing, by an analysis service mediation server, a type of analysis service that can be provided from at least one analysis service provider terminal;
An application providing step of providing a dedicated application for homomorphic encryption to a user terminal by the analysis service mediation server;
an analysis service provider display step of providing a list of the at least one analysis service provider to the user terminal by the analysis service mediation server;
a request acceptance step of receiving an analysis request and homomorphically encrypted data from the user terminal by the analysis service mediation server;
A smart contract creation step of generating, by the analysis service mediation server, a smart contract based on the analysis request, distributing it to a blockchain network, and transmitting the homomorphically encrypted data to the analysis service provider terminal;
An electronic signature step in which the user terminal and the selected analysis service provider terminal respectively perform digital signatures on the smart contract;
an analysis result providing step in which the selected analysis service provider terminal generates an analysis result for the homomorphically encrypted data and provides it to the user terminal;
a contract execution step of generating and transmitting a contract execution condition completion signal to the smart contract when the user terminal receives the analysis result; and
The user terminal decoding and confirming the analysis result
including,
The smart contract creation step of generating a smart contract based on the analysis request by the analysis service mediation server, distributing it to a blockchain network, and transmitting the homomorphically encrypted data to the analysis service provider terminal,
Prior to distributing the smart contract to the blockchain network, requesting an audit of the smart contract to an external smart contract audit agency server interlocked in advance; and
Modifying the smart contract based on the proposed solution and distributing it to the blockchain network when receiving the problem of the smart contract and the proposed solution from the external smart contract audit agency server
A data analysis service brokerage method based on block chain and homomorphic encryption further comprising. According to claim 8,
The homomorphic encrypted data is data encrypted with Somewhat Homomorphic Encryption (SHE) or Fully Homomorphic Encryption (FHE) based on a lattice encryption algorithm, data based on blockchain and homomorphic encryption. Analytical service brokerage method. According to claim 8,
Prior to the request acceptance step,
Generating, by the user terminal, a private key and the homomorphically encrypted data based on a library environment dedicated to homomorphic encryption provided by the dedicated application;
The step of the user terminal decoding and confirming the analysis result,
Decrypting the received analysis result with the private key;
The smart contract creation step,
A data analysis service mediation method based on blockchain and homomorphic encryption in which the analysis service mediation server generates and distributes the smart contract in which the wallet addresses, analysis costs, and contract execution conditions of the user and the selected analysis service provider are set.

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