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公开(公告)号：US20180048467A1
公开(公告)日：2018-02-15
申请号：US15544937
申请日：2016-03-02
Applicant: Hitachi, Ltd.
Inventor： Masayuki YOSHINO , Hisayoshi SATO , Ken NAGANUMA
CPC classification number: H04L9/0869 , G09C1/00 , H04L9/008 , H04L9/0662 , H04L9/085 , H04L2209/08 , H04L2209/24
Abstract: When data analysis is made in a server to which data is entrusted according to the technique disclosed in JP 5679018, individual cipher text is required to be decrypted in the server. That is, when basic statistics are computed in the server, a problem occurs that plain text of individual data is disclosed to the server side. The key generator according to the present invention transmits the sum of random numbers which is a key used when individual plaintext data is encrypted to the server as a key for decrypting the sum of ciphertext data, and the server decrypts the sum of ciphertext data using the key.
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2.发明申请公开(公告)号：US20220391518A1
公开(公告)日：2022-12-08
申请号：US17832103
申请日：2022-06-03
Applicant: Hitachi, Ltd.
Inventor： Yukie MOTOMIYA , Takayuki HABUCHI , Kenta TAKAHASHI , Ken NAGANUMA , Non KAWANA
Abstract: A first computer, in data registration processing: determines a type of biometric information for encryption with which the data is to be encrypted; acquires the determined type of biometric information for encryption from a user of the first computer; generates, from each piece of the acquired biometric information for encryption, a public key based on a predetermined algorithm; transmits the public key to a second computer; and transmits the data encrypted with the public key to the third computer, the first computer, in data presentation processing: acquires the encrypted data from a third computer; acquires the determined type of biometric information for decryption from the user of the first computer; generates, from each piece of the acquired biometric information for decryption, a private key based on the predetermined algorithm; decrypts the encrypted data with use of the private key; and presents each piece of the decrypted registered data.
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公开(公告)号：US20190318104A1
公开(公告)日：2019-10-17
申请号：US16379457
申请日：2019-04-09
Applicant: Hitachi, Ltd.
Inventor： Masayuki YOSHINO , Hisayoshi SATO , Ken NAGANUMA , Takayuki SUZUKI
Abstract: A data analysis server holds base-point-added information, wherein the base-point-added information includes a value of an explanatory variable encrypted by first high-performance encryption, a value of a response variable encrypted by a predetermined encryption scheme, and a base point based on frequencies of the value of the explanatory variable in information for learning are associated with one another, wherein the data analysis server: executes decision tree generation processing for generating a decision tree having a leaf node associated with the value of the response variable encrypted by the predetermined encryption scheme, which is included in the base-point-added information; and execute branching rule determine processing in decision tree generation processing without decrypting the value of the explanatory variable and the base point corresponding.
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公开(公告)号：US20190238344A1
公开(公告)日：2019-08-01
申请号：US16318501
申请日：2016-07-21
Applicant: HITACHI, LTD.
Inventor： Yosuke KAGA , Kenta TAKAHASHI , Masakazu FUJIO , Ken NAGANUMA
CPC classification number: H04L9/3268 , G06F21/32 , G06F21/33 , G06F21/64 , H04L9/0891 , H04L9/0894 , H04L9/32 , H04L9/3247 , H04L2209/38
Abstract: A database management method for controlling, by a computer including a processor, a memory, and a storage device, an in-memory database for storing all tables and indices in the memory and a disk type database for storing a part of a table stored in the storage device in a buffer included in the memory, in which the computer acquires information of the tables and the indices of the in-memory type database, determines the type of reduction operation for reducing an area on the memory used by the indices, executes the type of reduction operation determined for the indices, and adds, to the buffer, an area reduced from the area of the memory used by the indices of the in-memory type database by the reduction operation to expand the buffer of the disk type database.
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5.发明申请公开(公告)号：US20190228413A1
公开(公告)日：2019-07-25
申请号：US16313484
申请日：2017-03-22
Applicant: Hitachi, Ltd.
Inventor： Ken NAGANUMA , Hisayoshi SATO
Abstract: This auditing equipment includes a processor and a memory. The processor accepts a first transaction including information pertaining to a remittance source, an electronic value, and a cipher text, accepts a second transaction including information pertaining to a remittance destination, the electronic value, and a first preimage value, calculates a first plain text using a prescribed parameter and the first preimage value in the second transaction, calculates a second plain text by decrypting the cipher text in the first transaction, compares the first plain text to the second plain text, and associates the information pertaining to the remittance source in the first transaction with the information pertaining to the remittance destination in the second transaction if the first plain text matches the second plain text.
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Patent Agency Ranking
6.发明申请公开(公告)号：US20170322977A1
公开(公告)日：2017-11-09
申请号：US15524145
申请日：2014-11-07
Applicant: HITACHI, LTD.
Inventor： Ken NAGANUMA , Yoshinori SATOU , Hisayoshi SATO , Masayuki YOSHINO , Kunihiko KIDO
CPC classification number: G06F16/24553 , G06F16/9024 , G06F21/6227 , G09C1/00
Abstract: A system for retrieving an encrypted graph, in which a first computer generates an encrypted graph, and a second computer retrieves the encrypted graph, wherein: the first computer generates a secret key, encrypts a graph that includes a start point, an edge, and an end point to generate an encrypted graph, generates an encryption query, transmits encrypted graph data in which the encrypted graph and the encryption query are correlated for each edge and a searchable encryption matching function to the second computer, generates an encrypted graph retrieval query in which a graph to be retrieved is encrypted by the retrievable cryptogram query function, and transmits the generated retrieval query to the second computer; and the second computer, accepts the received encrypted graph retrieval query and encrypted graph data as inputs, and executes a retrieval process using the searchable encryption matching function.
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公开(公告)号：US20190260715A1
公开(公告)日：2019-08-22
申请号：US16276798
申请日：2019-02-15
Applicant: Hitachi, Ltd.
Inventor： Takayuki SUZUKI , Toshirou YAMAYOSHI , Hisayoshi SATO , Masayuki YOSHINO , Ken NAGANUMA , Dai WATANABE
IPC: H04L29/06 , H04L9/06 , G06F16/2455 , H04L9/30 , G06F17/18
Abstract: A computer system includes a plurality of processing nodes constituting a blockchain network and a connection apparatus connecting to the blockchain network. The processing node holds information. The connection apparatus includes a connection processing unit that transmits a transaction to the processing node. The connection processing unit includes an encryption processing unit that generates searchable ciphertext from a keyword based on a probabilistic encryption method. The encryption processing unit generates, from the keyword, the searchable ciphertext to be used as an address indicating a transmission source or a transmission destination of the transaction, and generates the transaction including the searchable ciphertext.
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8.发明申请SEARCHABLE ENCRYPTION PROCESSING SYSTEM AND SEARCHABLE ENCRYPTION PROCESSING METHOD 审中-公开可搜索的加密处理系统和可搜索的加密处理方法公开(公告)号：US20160335450A1
公开(公告)日：2016-11-17
申请号：US15111747
申请日：2015-01-14
Applicant: HITACHI, LTD.
Inventor： Masayuki YOSHINO , Hisayoshi SATO , Ken NAGANUMA , Yoshinori SATO
CPC classification number: G06F21/6227 , G06F16/334 , G06F16/35 , H04L9/008 , H04L9/0894
Abstract: A searchable encryption processing system includes a server including: a communication device to communicate with another device; a storage device configured to store as search target data, secret data obtained by concealing plaintext data, and a secret index obtained by concealing a plaintext index to classify the plaintext data; and an arithmetic device to execute a process including receiving, from a search client, a secret data query obtained by concealing a plaintext query, and a secret index query obtained by concealing a plaintext index, searching the storage device for a secret index matching the secret index query based on a predetermined searchable encryption technique, searching a secret data group classified by the matching secret index for secret data matching the secret data query, and returning the searched secret data to the search client.
Abstract translation: 一种可搜索加密处理系统，包括：服务器，包括：与另一设备通信的通信设备; 存储装置，被配置为存储作为搜索目标数据，通过隐藏明文数据获得的秘密数据和通过隐藏明文索引而获得的秘密索引来对明文数据进行分类; 以及执行包括从搜索客户端接收通过隐藏明文查询获得的秘密数据查询和通过隐藏明文索引而获得的秘密索引查询的处理的算术装置，搜索与所述秘密相匹配的秘密索引的存储设备 基于预定的可搜索加密技术的索引查询，搜索通过匹配秘密索引分类的秘密数据组用于与秘密数据查询匹配的秘密数据，并将搜索的秘密数据返回到搜索客户端。
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公开(公告)号：US20240378284A1
公开(公告)日：2024-11-14
申请号：US18144714
申请日：2023-05-08
Applicant: HITACHI, Ltd.
Inventor： Kaiho FUKUCHI , Takayuki SUZUKI , Takatoshi OHARA , Shin TEZUKA , Nobutaka KAWAGUCHI , Ken NAGANUMA
IPC: G06F21/55
Abstract: A method for generating blockchain bug bounty. The method may include performing, by a first processor, bug detection by issuing a transaction for execution in runtime of a private blockchain system, wherein the private blockchain system is set in a first node of a plurality of nodes, and the first node is a private blockchain node; monitoring the transaction in the runtime and outputting first feature values associated with the transaction, wherein the first feature values are generated by performing feature extraction on the transaction.
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公开(公告)号：US20190147770A1
公开(公告)日：2019-05-16
申请号：US15759532
申请日：2015-12-14
Applicant: Hitachi, Ltd.
Inventor： Masayuki YOSHINO , Hisayoshi SATO , Ken NAGANUMA
Abstract: Provided is a data processing system having a processor and a storage apparatus coupled to the processor, wherein: the storage apparatus holds a plurality of encrypted data that are generated by encrypting a plurality of plain text data, and a plurality of encrypted queries for retrieving the plurality of encrypted data directly in an encrypted state; and the processor retrieves each of the encrypted data using each of the encrypted queries and thereby calculates the number of appearances of encrypted data that are retrieved using each of the encrypted queries, changes at least two of the plurality of encrypted data on the basis of the number of appearances of encrypted data that are retrieved using each of the encrypted queries so that predetermined anonymity is satisfied, and outputs a plurality of encrypted data.
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