WO2023017597A1 - 秘密計算システム、方法、記録媒体、及び、情報処理システム - Google Patents
秘密計算システム、方法、記録媒体、及び、情報処理システム Download PDFInfo
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- WO2023017597A1 WO2023017597A1 PCT/JP2021/029709 JP2021029709W WO2023017597A1 WO 2023017597 A1 WO2023017597 A1 WO 2023017597A1 JP 2021029709 W JP2021029709 W JP 2021029709W WO 2023017597 A1 WO2023017597 A1 WO 2023017597A1
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- 230000010365 information processing Effects 0.000 title claims description 15
- 238000000034 method Methods 0.000 title claims description 6
- 238000004364 calculation method Methods 0.000 claims description 71
- 238000010586 diagram Methods 0.000 description 10
- 238000004458 analytical method Methods 0.000 description 6
- 238000004891 communication Methods 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 230000006870 function Effects 0.000 description 4
- 238000012935 Averaging Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
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- 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
- G06F21/62—Protecting access to data via a platform, e.g. using keys or access control rules
- G06F21/6218—Protecting access to data via a platform, e.g. using keys or access control rules to a system of files or objects, e.g. local or distributed file system or database
- G06F21/6245—Protecting personal data, e.g. for financial or medical purposes
- G06F21/6254—Protecting personal data, e.g. for financial or medical purposes by anonymising data, e.g. decorrelating personal data from the owner's identification
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q40/00—Finance; Insurance; Tax strategies; Processing of corporate or income taxes
Definitions
- the present disclosure relates to secure computing systems and the like.
- Patent Literature 1 discloses a secure computing system capable of performing computation while encrypting data.
- Patent Literature 2 discloses a system that utilizes data without disclosing details of data held by each company to other companies.
- the financial institution can compare the information held by the financial institution with the information held by other financial institutions, the results of the comparison can be used in future marketing. However, it is difficult to pass information held by one financial institution to another financial institution.
- the purpose of this disclosure is to provide a secure calculation system, etc. that facilitates understanding of financial transaction trends of multiple financial institutions.
- a secure computing system includes acquisition means for acquiring financial transaction information held by each of a plurality of financial institutions in an anonymized format; It comprises secure calculation means for calculating and output means for outputting the index.
- a method acquires financial transaction information held by each of a plurality of financial institutions in an anonymized format, calculates an index based on the financial transaction information of the plurality of financial institutions by secure calculation, and calculates the index to output
- a program acquires financial transaction information held by each of a plurality of financial institutions in an anonymized format, calculates an index based on the financial transaction information of the plurality of financial institutions by secure calculation, and calculates the index Let the computer do what is output.
- FIG. 1 is a block diagram showing the configuration of an information processing system 10;
- FIG. 4 is a flow chart showing an example of operation of the secure computing system 100.
- FIG. FIG. 10 is a diagram showing an example of an index;
- FIG. 10 is a diagram showing an example of a comparison report;
- FIG. 10 is a diagram showing another example of a comparison report;
- 4 is a flow chart showing an example of the operation of the information processing system 10;
- 5 is a block diagram showing an example of the hardware configuration of computer 500.
- FIG. 1 is a block diagram showing the configuration of an information processing system 10 according to one embodiment.
- the information processing system 10 is a system for analyzing financial transaction trends based on financial transaction information held by each financial institution.
- Financial institutions include, for example, banks (including city banks, Japan Post Bank, regional banks, credit unions, and credit unions), securities companies, and insurance companies that handle financial products, as well as credit card companies and cashless Includes payment service providers that handle payments.
- the financial institution in one embodiment also includes an article lessor that engages in the leasing and rental business of automobiles and home electric appliances.
- Financial products include, for example, deposits, bonds, investment trusts, foreign currencies, insurance, stocks, futures trading, FX, virtual currency, and the like.
- Financial transaction information is information related to transactions conducted by financial institutions. Since financial transaction information is confidential information, it is difficult to share financial transaction information among multiple financial institutions. Financial transaction information includes, for example, one or both of sales information of financial institutions and customer information of customers of financial institutions. However, the financial transaction information is not limited to the information described above as long as it is related to transactions conducted by financial institutions.
- Financial institution sales information indicates, for example, information about the sales of one financial institution.
- the sales information may include, for example, the amount or number of sales of financial products sold by financial institutions, the amount of trust fees, the amount of income from commissions and interest, or the amount of gains from trading of bonds and stocks.
- the sales information may indicate the amount of money or the number of sales, but is not limited to these, and may indicate the rate of increase in the amount of money or the rate of increase in the number of sales.
- Sales information may indicate sales of one type of financial product, but is not limited to this. Sales information may indicate sales of two or more types of financial instruments.
- the customer information is information about customers who have transactions with the financial institution, and may include, for example, at least one of the number of customers, past transaction status, and customer attributes.
- the number of customers may be the total number of customers with whom the financial institution has conducted transactions so far, the number of customers with whom the financial institution currently has transactions, or the number of customers targeted in the future.
- the past transaction status is, for example, past account deposit/withdrawal information and information on financial products purchased by the customer in the past.
- Customer attributes include, in the case of individual customers, attributes such as the customer's occupation, gender, age, place of residence, and family composition. For corporate customers, customer attributes include attributes such as business content, business scale, and location.
- the financial transaction information is information related to past transactions
- an index indicating trends in the performance of financial transactions of a plurality of financial institutions, which is to be compared with the performance of one financial institution can be obtained.
- financial transaction information is not limited to information on past transactions, and may be information on forecasts and targets for future transactions. Forecasts and targets may be set by, for example, executives of financial institutions.
- the financial transaction information may not include at least part of the information described above, and may include information other than the information described above.
- the information processing system 10 includes a secure computing system 100 and a plurality of financial institution systems 200 (200a, 200b).
- the secure computing system 100 is operated, for example, by a service provider that provides financial analysis service tools and the like to each financial institution.
- the service provider provides a financial analysis service that analyzes trends of multiple financial institutions based on financial institution information acquired from each financial institution system 200 .
- the financial institution system 200 is owned and operated by individual financial institutions. Although the number of financial institution systems 200 is two in FIG. 1, it is not limited to this. A plurality of financial institution systems 200 may be included as many as the number of financial institutions participating in analysis by the information processing system 10 .
- Financial institution system 200 is an example of a first system.
- Each financial institution system 200 includes storage units 201 (201a, 201b), anonymization units 202 (202a, 202b), and output units 203 (203a, 203b).
- the financial institution system 200 may further include a request section 204 (204a, 204b).
- the storage unit 201, the anonymization unit 202, the output unit 203, and the request unit 204 are examples of storage means, anonymization means, first output means, and request means, respectively.
- the storage unit 201 stores financial transaction information.
- the anonymization unit 202 anonymizes the financial transaction information stored in the storage unit 201 .
- the anonymity providing unit 202 may analyze the stored financial transaction information, which is raw data, and generate new financial transaction information.
- the anonymization unit 202 may anonymize financial transaction information newly obtained through analysis.
- the output unit 203 transmits the financial transaction information anonymized by the anonymization unit 202 in an anonymized format to the secure computing system 100 via the communication network.
- the request unit 204 requests the secure computing system 100 to transmit the result of secure computation. Further, the request unit 204 receives calculation results from the secure computing system 100 . The received calculation results are displayed, for example, on any display.
- Secure computing system 100 is an example of a second system.
- Secure computing system 100 includes acquisition unit 101 , secure computing unit 102 , and output unit 103 .
- Acquisition unit 101, secure calculation unit 102, and output unit 103 are examples of acquisition means, secure calculation means, and output means (or second output means), respectively.
- the acquisition unit 101 acquires financial transaction information held by each of a plurality of financial institutions in an anonymized format.
- the acquisition unit 101 may acquire financial transaction information from the output unit 203 provided in each of the plurality of financial institution systems 200, for example.
- the secure calculation unit 102 uses secure calculation to calculate indices based on financial transaction information of multiple financial institutions.
- Secure computation is computation performed while keeping data confidential.
- secure computation here means executing computation while keeping financial transaction information confidential. Since the calculation is performed while keeping the financial transaction information confidential, each financial institution can provide the financial transaction information it possesses for analysis.
- An example of secure computation and an example of indices will be described later.
- the secure calculation unit 102 calculates an index that cannot be specified by financial institutions.
- “Financial institution is unidentifiable” means that individual financial transaction information or a value obtained based on individual financial transaction information regarding a specific financial institution among multiple financial institutions involved in the calculation of the indicator cannot be determined. include. Since the financial institution cannot be identified from the index and the original financial transaction information cannot be identified, each financial institution can use the index without disclosing the original information to other financial institutions.
- the output unit 103 outputs the index, which is the calculation result of the secure calculation unit 102 .
- the output unit 103 outputs the index to the financial institution system 200, for example. More specifically, the output unit 103 outputs the index to the request unit 204 of the financial institution system 200, for example.
- the secure computation unit 102 may perform computation based on a request from the request unit 204 of the financial institution system 200. Also, the output unit 103 may output the index based on a request from the request unit 204 .
- FIG. 2 is a flow chart showing an example of the operation of the secure computing system 100 according to one embodiment.
- the acquisition unit 101 acquires financial transaction information held by each of a plurality of financial institutions in an anonymized format (step S101).
- the secure computation unit 102 performs secure computation while keeping the financial transaction information acquired by the acquisition unit 101 confidential (step S102).
- Secure calculation unit 102 obtains an index based on financial transaction information of a plurality of financial institutions as a result of secure calculation (step S103).
- the secure calculation unit 102 may perform calculation by secure calculation using, for example, financial transaction information anonymized by secret sharing.
- the anonymized data a is secret-divided into shared values x, y, . . . , and x, y, .
- each server communicates with each other while proceeding with the calculation while keeping the anonymized data a secret-shared.
- the result of this calculation serves as an index based on financial transaction information of multiple financial institutions. Therefore, when multi-party calculation is used as the secure calculation method, the secure calculation unit 102 is realized by a plurality of servers. Multi-party computation does not require cryptographic key management or an isolated environment, and is generally faster to compute.
- the index calculated by the secure calculation unit 102 based on financial transaction information of multiple financial institutions is an index that indicates trends in financial transactions of multiple financial institutions.
- An index based on financial transaction information of multiple financial institutions is an index in which the financial institution cannot be identified and the financial transaction information cannot be identified.
- the index may be information obtained by integrating financial transaction information or a value obtained by statistically processing financial transaction information.
- the index may be an index that allows the position of one financial institution to be grasped among a plurality of financial institutions.
- Indicators based on financial transaction information of a plurality of financial institutions serve as targets for comparison with the situation of the financial institution to which the person in charge belongs.
- the secure calculation unit 102 may calculate, as an index, the sum or average of the sales amounts of a plurality of financial institutions for sales of financial products in a predetermined period. Also, the index calculated by the secure calculation unit 102 may be the average rate of increase in the amount of sales of each financial institution.
- the index may be an index obtained by averaging the ratio of the transaction amount for each financial product to the total transaction amount for each financial institution for multiple financial institutions.
- the index may be calculated for each type of financial product. If the major categories of investment trusts, foreign currencies, and insurance are further divided into minor categories according to type, the index may be calculated for each major category or for each minor category.
- FIG. 3 is a diagram showing examples of indicators.
- the index in FIG. 3 is calculated from the financial transaction information of the three financial institutions. This index indicates that the average increase rate of the three financial institutions A, B, and C is 5% in terms of the increase rate of the transaction amount of a certain type of financial product X such as mutual funds from the previous month. Individual financial institutions are not identified from the 5% growth rate indicator. Also, the original financial transaction information is not specified.
- the secure calculation unit 102 may calculate the total or average number of customers of a plurality of financial institutions as an index based on customer information including the number of customers. Also, the index calculated by the secure calculation unit 102 may be the average rate of increase in the number of customers of each financial institution.
- the index may be an index obtained by averaging the percentage of customer attributes for each financial institution. If the financial transaction information includes both the status of past transactions and customer attributes, the index may be an index that averages the ratio of attributes of customers who have purchased a given financial product for each financial institution. Specifically, for example, the secure calculation unit 102 obtains the percentage of customers aged between 40 and 49 among the investment trust purchasers based on the financial transaction information held by each financial institution. The secure calculation unit 102 may calculate the average ratio obtained for each financial institution as an index. The secure calculation unit 102 may similarly calculate indices for the ratios of other age groups. The secure calculation unit 102 may calculate the index based on, for example, annual income class instead of age group.
- the financial transaction information used in the calculation of the index by the secure calculation unit 102 is not limited to the sales amount of financial products and customer attributes in the above example, and other financial transaction information may be used.
- the secure calculator 102 can calculate various indicators based on various financial transaction information.
- the index calculated by the secure calculation unit 102 may be one, but is not limited to one.
- the secure calculation unit 102 may calculate multiple indices.
- the requesting unit 204 of the financial institution system 200 may receive input from the person in charge of the financial institution regarding what index is requested.
- the request unit 204 may request the secure calculation unit 102 to calculate the index of the accepted type.
- the secure calculation unit 102 calculates the requested type of index based on the request.
- the output unit 103 outputs the index calculated by the secure calculation unit 102 (step S104).
- the output unit 103 may output one index, but the number is not limited to one.
- the output unit 103 may output multiple indices calculated by the secure calculation unit 102 .
- the output unit 103 may output the index as a numerical value.
- the output unit 103 may output the index in the form of a table or any graph.
- Graphs include, for example, pie charts, band graphs, bar graphs, and line graphs.
- the person in charge at the financial institution looks at the output indicators and compares them with the situation at the financial institution to which they belong. Using the comparison result, for example, the future marketing policy and the management strategy of the financial institution are determined.
- the output unit 103 may extract and output information related to the index from a website or SNS (Social Networking Service) together with the index.
- the information related to the index is, for example, information about the time indicated by the index.
- the output unit 103 outputs, for example, economic trends such as market prices, press releases of financial institutions, press releases of companies related to investment trusts, personnel announcements of financial institutions, or news of implemented campaigns and advertisements, together with indicators. may
- the acquisition unit 101 acquires financial transaction information held by each of a plurality of financial institutions in an anonymized format.
- a secure calculation unit 102 calculates an index based on financial transaction information of a plurality of financial institutions by secure calculation.
- the output unit 103 outputs the calculated index. Therefore, it becomes easy to grasp the trend of financial transactions of a plurality of financial institutions.
- the output unit 103 may also output an index based on financial transaction information of one financial institution.
- the index based on financial transaction information of one financial institution may be an index that can be compared with the index calculated by the secure calculation unit 102 based on financial transaction information of a plurality of financial institutions.
- the financial transaction information of one financial institution to be compared may or may not be used for the calculation of the index based on the financial transaction information of a plurality of financial institutions.
- the secure computation unit 102 can perform computations based on requests from the request unit 204 of one financial institution.
- the output unit 103 may output the index of the financial institution that requested the calculation and the indices of the plurality of financial institutions to the financial institution.
- An output example that includes an index based on financial transaction information of one financial institution and an index based on financial transaction information of multiple financial institutions is hereinafter referred to as a comparison report.
- the secure calculation unit 102 may calculate an index based on financial transaction information of a single financial institution as well as an index based on financial transaction information of a plurality of financial institutions.
- the comparison report may be generated by other elements of the secure computing system 100, such as a report generator (not shown). Secure computation may not be used to generate the comparison report.
- the output unit 103 may output a comparison report for one type of index, but the output report is not limited to this.
- the output unit 103 may output a comparison report for multiple types of indices.
- FIG. 4 is a diagram showing an example of a comparison report.
- FIG. 4 shows the indicators for Financial Institution A and the indicators for Financial Institutions A, B, and C in a comparable manner.
- the indicator for Financial Institution A shows that the rate of increase in transaction value from the previous month was 8%.
- the indicators for financial institutions A, B, and C are the same as those shown in FIG.
- FIG. 5 is a diagram showing another example of a comparison report.
- FIG. 6 shows the ratio of financial institution A and the average ratio of all financial institutions participating in the analysis with respect to the age ratio of purchasers of financial product X.
- the ratio for financial institutions is an example of an index based on financial transaction information of one financial institution.
- the average ratio for all financial institutions is an example of an indicator based on financial transaction information of multiple financial institutions.
- the operation of the information processing system 10 when the secure computing system 100 outputs the comparison report includes the operation when the secure computing system 100 outputs the index.
- FIG. 6 is a flow chart showing an example of the operation of the information processing system 10 when outputting a comparison report.
- the anonymization unit 202 of each financial institution system 200 anonymizes financial transaction information (step S201). Also, the output unit 203 of each financial institution system 200 outputs the confidential financial transaction information to the secure computing system 100 (step S202).
- the acquisition unit 101 of the secure computing system 100 acquires anonymized financial transaction information transmitted from a plurality of financial institution systems 200 (step S203).
- the request unit 204 of at least one financial institution system 200 requests the output of the comparison report (step S204).
- Secure calculation unit 102 executes secure calculation based on the request and generates a comparison report (step S205). Specifically, the secure calculation unit 102 calculates an index based on financial transaction information of a single financial institution as well as an index based on financial transaction information of a plurality of financial institutions. Furthermore, the secure calculation unit 102 generates a comparison report with which indices can be compared.
- the output unit 103 outputs the generated comparison report to the financial institution system 200 (step S206).
- the request unit 204 acquires a comparison report from the secure computing system 100 (step S207).
- the obtained comparison report is displayed on a display such as a personal computer or a tablet used by the person in charge of the financial institution, and presented to the person in charge of the financial institution.
- each financial institution is usually able to calculate its own indicators based on the financial transaction information it possesses. Therefore, the secure calculation unit 102 does not need to calculate indices based on the financial transaction information of one financial institution.
- the output unit 203 of the financial institution system 200 may transmit the index of one financial institution together with the financial transaction information.
- the requesting unit 204 may transmit the index of one financial institution along with the request for the comparison report.
- the index of one financial institution may be stored in the storage unit 201 in advance, or may be calculated by the anonymization unit 202 or other elements of the financial institution system 200 .
- the index of one financial institution may be anonymized by the anonymization unit 202, or may not be anonymized.
- the acquisition unit 101 may acquire an index based on financial transaction information of one financial institution from the financial institution system 200 .
- the output unit 103 may output the comparison report using the calculated index and the acquired index.
- the plurality of financial institutions are not limited to financial institutions of the same type of industry, and may be composed of banks and financial institutions other than banks, such as banks, securities companies, and insurance companies. Even when a plurality of financial institutions are composed of banks, they may be composed of banks of different sizes such as a city bank and a regional bank.
- each component of the secure computing system 100 and financial institution system 200 represents a functional unit block.
- a part or all of each component of each device may be realized by any combination of the computer 500 and a program.
- FIG. 7 is a block diagram showing an example of the hardware configuration of computer 500.
- computer 500 includes, for example, CPU (Central Processing Unit) 501, ROM (Read Only Memory) 502, RAM (Random Access Memory) 503, program 504, storage device 505, drive device 507, communication interface 508 , an input device 509 , an input/output interface 511 and a bus 512 .
- CPU Central Processing Unit
- ROM Read Only Memory
- RAM Random Access Memory
- the program 504 includes instructions for realizing each function of each device.
- the program 504 is stored in advance in the ROM 502 , RAM 503 and storage device 505 .
- the CPU 501 implements each function of each device by executing instructions included in the program 504 .
- the functions of the secure computing system 100 are implemented by the CPU 501 of the secure computing system 100 executing instructions included in the program 504 .
- the RAM 503 may store data processed in each function of each device.
- the drive device 507 reads from and writes to the recording medium 506 .
- Communication interface 508 provides an interface with a communication network.
- the input device 509 is, for example, a mouse, a keyboard, or the like, and receives input of information from the person in charge of the financial institution.
- the output device 510 is, for example, a display, and outputs (displays) information to the person in charge or the like.
- the input/output interface 511 provides an interface with peripheral devices.
- a bus 512 connects each of these hardware components.
- the program 504 may be supplied to the CPU 501 via a communication network, or may be stored in the recording medium 506 in advance, read by the drive device 507 and supplied to the CPU 501 .
- FIG. 7 the hardware configuration shown in FIG. 7 is an example, and components other than these may be added, and some components may be omitted.
- each device may be implemented by any combination of a computer and a program that are different for each component.
- a plurality of components included in each device may be realized by any combination of a single computer and a program.
- each component of each device may be realized by a general-purpose or dedicated circuit including a processor or the like, or a combination thereof. These circuits may be composed of a single chip, or may be composed of multiple chips connected via a bus. A part or all of each component of each device may be realized by a combination of the above-described circuits and the like and programs.
- each component of each device when a part or all of each component of each device is realized by a plurality of computers, circuits, etc., the plurality of computers, circuits, etc. may be centrally arranged or distributed.
- Appendix 2 The secure computing system according to appendix 1, wherein the indicator is an indicator that cannot be specified by the financial institution.
- Appendix 3 3. The secure computing system according to appendix 1 or 2, wherein the index is an index in which the financial transaction information cannot be specified.
- the secure computing means performs computation based on a request from one financial institution, 4.
- the secure computing system according to any one of appendices 1 to 3, wherein the output means outputs the index to the one financial institution that has made the request.
- Appendix 5 The secret according to any one of appendices 1 to 4, wherein said output means outputs an index based on financial transaction information of one financial institution, which is comparable with said index based on financial transaction information of said plurality of financial institutions. calculation system.
- Appendix 6 The secure computing system according to appendix 5, wherein the output means outputs a comparison report including the index based on the financial transaction information of the plurality of financial institutions and the index based on the financial transaction information of the one financial institution.
- Appendix 7 The secure computing system according to any one of appendices 1 to 6, wherein the financial transaction information includes one or both of sales information of the financial institution and customer information of customers of the financial institution.
- Appendix 8 8. The secure computing system according to any one of appendices 1 to 7, wherein the secure computing means performs computation by secure computation using the financial transaction information concealed by secret sharing.
- Appendix 10 Acquire financial transaction information held by each of multiple financial institutions in an anonymized format, calculating an index based on the financial transaction information of the plurality of financial institutions by secure calculation;
- a recording medium for non-temporarily recording a program that causes a computer to output the index.
- An information processing system having a plurality of first systems and a second system, each said first system comprising: a storage means for storing financial transaction information held by a financial institution; anonymization means for anonymizing the financial transaction information; a first output means for transmitting the financial transaction information to the second system in an anonymized format;
- the second system comprises: Acquisition means for acquiring the financial transaction information of a plurality of financial institutions from the plurality of first systems in an anonymized format; Secure calculation means for calculating an index based on the financial transaction information of the plurality of financial institutions by secure calculation; and a second output means for outputting the index.
- the first system further comprises request means for requesting the output of the indicator from the second system,
- the output means of the second system transmits an index based on the financial transaction information transmitted by the first system to the first system comprising the request means that requested the output of the index, and the plurality of financial 12.
- the information processing system according to appendix 11, wherein the index based on the financial transaction information of the institution is output in a comparable manner.
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Abstract
Description
図1は、一実施形態における情報処理システム10の構成を示すブロック図である。情報処理システム10は、各金融機関が保有する金融取引情報に基づいた金融取引の動向に関する分析を行うためのシステムである。
金融機関システム200は、第1のシステムの一例である。金融機関システム200のそれぞれは、記憶部201(201a、201b)、秘匿化部202(202a、202b)、及び、出力部203(203a、203b)を備える。金融機関システム200は、さらに、要求部204(204a、204b)を備えてもよい。記憶部201、秘匿化部202、出力部203、及び、要求部204は、それぞれ記憶手段、秘匿化手段、第1出力手段、要求手段の一例である。
次に、本実施形態の基本構成である秘密計算システム100について詳しく説明する。秘密計算システム100は、第2のシステムの一例である。秘密計算システム100は、取得部101、秘密計算部102、及び、出力部103を備える。取得部101、秘密計算部102、及び、出力部103は、それぞれ取得手段、秘密計算手段、及び、出力手段(または第2出力手段)の一例である。
秘密計算方法としては、準同型暗号等の特定の処理に対応した特殊な暗号化、ハードウェア上で隔離された状態で処理する高信頼実行環境(Trusted Execution Environment)、又は複数のサーバで秘密分散したまま計算処理(秘密分散計算)するマルチパーティ計算等を用いることができる。秘密計算部102は、例えば、秘密分散により秘匿化された金融取引情報を用いて秘密計算により計算してもよい。
秘密計算部102が計算する、複数の金融機関の金融取引情報に基づく指標とは、複数の金融機関の金融取引の動向を示す指標である。複数の金融機関の金融取引情報に基づく指標は、金融機関が特定不可能であり、金融取引情報が特定不可能な指標である。指標は、金融取引情報を統合した情報、または、金融取引情報を統計的に処理した値であってもよい。指標は、複数の金融機関の中での一の金融機関の位置づけが把握できる指標であってもよい。複数の金融機関の金融取引情報に基づく指標は、金融機関の担当者にとって、担当者が所属する金融機関の状況との比較対象となる。
出力部103が出力する指標は1つであってもよいが、1つには限られない。出力部103は、秘密計算部102が計算した複数の指標を出力してもよい。出力部103は指標を数値として出力してもよい。あるいは、出力部103は、指標をテーブルまたは任意のグラフの形式で出力してもよい。グラフには、例えば、円グラフ、帯グラフ、棒グラフ、折れ線グラフが含まれる。
<比較レポートの出力>
一実施形態において、出力部103は、さらに、一の金融機関の金融取引情報に基づく指標を出力してもよい。一の金融機関の金融取引情報に基づく指標は、秘密計算部102が計算した複数の金融機関の金融取引情報に基づく指標と、比較可能な指標であってもよい。ここで、複数の金融機関の金融取引情報に基づく指標の計算には、対比される一の金融機関の金融取引情報が用いられてもよいし、用いられなくてもよい。秘密計算部102は、一の金融機関の要求部204からの要求に基づいて計算を実行しうる。出力部103は、計算を要求した一の金融機関と、複数の金融機関との指標を該一の金融機関に出力してもよい。
一実施形態において、複数の金融機関は、同じ業種体の金融機関に限られず、銀行、証券会社又は保険会社といった、銀行と銀行以外の金融機関とで構成されていても構わない。複数の金融機関が銀行同士で構成されている場合であっても、都市銀行と地方銀行等の規模の異なる銀行の同士で構成されていても構わない。
上述した各実施形態において、秘密計算システム100及び金融機関システム200の各構成要素は、機能単位のブロックを示している。各装置の各構成要素の一部又は全部は、コンピュータ500とプログラムとの任意の組み合わせにより実現されてもよい。
複数の金融機関の各々が保有する金融取引情報を秘匿化した形式で取得する取得手段と、
前記複数の金融機関の前記金融取引情報に基づく指標を秘密計算により計算する秘密計算手段と、
前記指標を出力する出力手段と、
を備える秘密計算システム。
前記指標は、前記金融機関が特定不可能な指標である
付記1に記載の秘密計算システム。
前記指標は、前記金融取引情報が特定不可能な指標である
付記1または2に記載の秘密計算システム。
前記秘密計算手段は、一の金融機関からの要求に基づいて計算を実行し、
前記出力手段は、前記要求をした前記一の金融機関に前記指標を出力する
付記1乃至3のいずれか1つに記載の秘密計算システム。
前記出力手段は、前記複数の金融機関の金融取引情報に基づく前記指標と比較可能な、一の金融機関の金融取引情報に基づく指標を出力する
付記1乃至4のいずれか1つに記載の秘密計算システム。
前記出力手段は、前記複数の金融機関の金融取引情報に基づく前記指標と、前記一の金融機関の金融取引情報に基づく前記指標とを含む比較レポートを出力する
付記5に記載の秘密計算システム。
前記金融取引情報は、前記金融機関の売上情報、及び、前記金融機関の顧客の顧客情報の一方又は両方を含む
付記1乃至6のいずれか1つに記載の秘密計算システム。
前記秘密計算手段は、秘密分散により秘匿化された前記金融取引情報を用いて秘密計算により計算する
付記1乃至7のいずれか1つに記載の秘密計算システム。
複数の金融機関の各々が保有する金融取引情報を秘匿化した形式で取得し、
前記複数の金融機関の前記金融取引情報に基づく指標を秘密計算により計算し、
前記指標を出力する、
方法。
複数の金融機関の各々が保有する金融取引情報を秘匿化した形式で取得し、
前記複数の金融機関の前記金融取引情報に基づく指標を秘密計算により計算し、
前記指標を出力する、ことをコンピュータに実行させるプログラムを非一時的に記録する記録媒体。
複数の第1のシステムと、第2のシステムとを有する情報処理システムであって、
各々の前記第1のシステムは、
金融機関が保有する金融取引情報を記憶する記憶手段と、
前記金融取引情報を秘匿化する秘匿化手段と、
前記金融取引情報を秘匿化された形式で前記第2のシステムへ送信する第1出力手段、を備え、
前記第2のシステムは、
前記複数の第1のシステムから複数の金融機関の前記金融取引情報を秘匿化した形式で取得する取得手段と、
前記複数の金融機関の前記金融取引情報に基づく指標を秘密計算により計算する秘密計算手段と、
前記指標を出力する第2出力手段と、を備える
情報処理システム。
前記第1のシステムは、前記第2のシステムに前記指標の出力を要求する要求手段、をさらに備え、
前記第2のシステムの出力手段は、前記指標の出力を要求した前記要求手段を備える前記第1のシステムに、該第1のシステムが送信した前記金融取引情報に基づく指標と、前記複数の金融機関の前記金融取引情報に基づく指標と、を比較可能に出力する
付記11に記載の情報処理システム。
101 取得部
102 秘密計算部
103 出力部
200 金融機関システム
201 記憶部
202 秘匿化部
203 出力部
204 要求部
Claims (12)
- 複数の金融機関の各々が保有する金融取引情報を秘匿化した形式で取得する取得手段と、
前記複数の金融機関の前記金融取引情報に基づく指標を秘密計算により計算する秘密計算手段と、
前記指標を出力する出力手段と、
を備える秘密計算システム。 - 前記指標は、前記金融機関が特定不可能な指標である
請求項1に記載の秘密計算システム。 - 前記指標は、前記金融取引情報が特定不可能な指標である
請求項1または2に記載の秘密計算システム。 - 前記秘密計算手段は、一の金融機関からの要求に基づいて計算を実行し、
前記出力手段は、前記要求をした前記一の金融機関に前記指標を出力する
請求項1乃至3のいずれか1項に記載の秘密計算システム。 - 前記出力手段は、前記複数の金融機関の金融取引情報に基づく前記指標と比較可能な、一の金融機関の金融取引情報に基づく指標を出力する
請求項1乃至4のいずれか1項に記載の秘密計算システム。 - 前記出力手段は、前記複数の金融機関の金融取引情報に基づく前記指標と、前記一の金融機関の金融取引情報に基づく前記指標とを含む比較レポートを出力する
請求項5に記載の秘密計算システム。 - 前記金融取引情報は、前記金融機関の売上情報、及び、前記金融機関の顧客の顧客情報の一方又は両方を含む
請求項1乃至6のいずれか1項に記載の秘密計算システム。 - 前記秘密計算手段は、秘密分散により秘匿化された前記金融取引情報を用いて秘密計算により計算する
請求項1乃至7のいずれか1項に記載の秘密計算システム。 - 複数の金融機関の各々が保有する金融取引情報を秘匿化した形式で取得し、
前記複数の金融機関の前記金融取引情報に基づく指標を秘密計算により計算し、
前記指標を出力する、
方法。 - 複数の金融機関の各々が保有する金融取引情報を秘匿化した形式で取得し、
前記複数の金融機関の前記金融取引情報に基づく指標を秘密計算により計算し、
前記指標を出力する、ことをコンピュータに実行させるプログラムを非一時的に記録する記録媒体。 - 複数の第1のシステムと、第2のシステムとを有する情報処理システムであって、
各々の前記第1のシステムは、
金融機関が保有する金融取引情報を記憶する記憶手段と、
前記金融取引情報を秘匿化する秘匿化手段と、
前記金融取引情報を秘匿化された形式で前記第2のシステムへ送信する第1出力手段、を備え、
前記第2のシステムは、
前記複数の第1のシステムから複数の金融機関の前記金融取引情報を秘匿化した形式で取得する取得手段と、
前記複数の金融機関の前記金融取引情報に基づく指標を秘密計算により計算する秘密計算手段と、
前記指標を出力する第2出力手段と、を備える
情報処理システム。 - 前記第1のシステムは、前記第2のシステムに前記指標の出力を要求する要求手段、をさらに備え、
前記第2のシステムの出力手段は、前記指標の出力を要求した前記要求手段を備える前記第1のシステムに、該第1のシステムが送信した前記金融取引情報に基づく指標と、前記複数の金融機関の前記金融取引情報に基づく指標と、を比較可能に出力する
請求項11に記載の情報処理システム。
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