公开(公告)号：US20200028834A1

公开(公告)日：2020-01-23

申请号：US16511244

申请日：2019-07-15

Applicant: DENSO CORPORATION ,  TOHOKU UNIVERSITY

Inventor： Tsuneo NAKATA ,  Naoki IWATA ,  Masao SAKAI ,  Masayuki FUKUMITSU ,  Shingo HASEGAWA ,  Shuji ISOBE ,  Junya IWAZAKI ,  Eisuke KOIZUMI

IPC: H04L29/06 ,  H04L9/08 ,  H04L9/06

Abstract: An information intermediating apparatus in an information transaction system including an information providing apparatus, an information acquiring apparatus and the information intermediating apparatus connected to a communication network, includes: a first receiver that receives second information, of first and second information necessary for restoring transaction object information, and first feature information indicating a feature of the first information; a second receiver that receives second feature information from the information acquiring apparatus, the second feature information being calculated from the first information transmitted to the information acquiring apparatus from the information providing apparatus; a feature information determination unit that determines whether an identity is present between the first feature information and the second feature information; and a transmitter that transmits the second information to the information acquiring apparatus, when the feature information determination unit determines that the identity is present between the first feature information and the second feature information.

公开(公告)号：US20200153637A1

公开(公告)日：2020-05-14

申请号：US16674379

申请日：2019-11-05

Applicant: TOHOKU UNIVERSITY

Inventor： Masao SAKAI ,  Junya IWAZAKI ,  Eisuke KOIZUMI ,  Shingo HASEGAWA ,  Shuji ISOBE ,  Masayuki FUKUMITSU

IPC: H04L9/32 ,  G06Q20/40 ,  G06Q20/38

Abstract: An information processing system 100 includes a first node 1 that stores data; a second node 2 that receives the data from the first node 1; at least one storage node 3; and a blockchain 4. The first node 1 includes a first identification information generation unit 152, a template acquisition unit 153, a contract document preparation unit 154, a contract document release unit 155, and a storage request unit 156, wherein a template is provided with an address area in which a data-receiving address of a node that wishes to obtain the data is entered. The second node 2 includes a contract document selection unit 251, an address entry unit 252, a signature unit 253, and a registration unit 254. The at least one storage node 3 includes a storage execution unit 353, a contract completion determination unit 354, and a data transmission unit 355.

公开(公告)号：US20200153628A1

公开(公告)日：2020-05-14

申请号：US16674353

申请日：2019-11-05

Applicant: TOHOKU UNIVERSITY

Inventor： Masao SAKAI ,  Junya IWAZAKI ,  Eisuke KOIZUMI ,  Shingo HASEGAWA ,  Shuji ISOBE ,  Masayuki FUKUMITSU

IPC: H04L9/30

Abstract: An information processing system 100 comprising at least one first node 1, second nodes 2 for providing a public key change assistance service, and a blockchain 3, wherein the first node 1 comprises a new public key creation unit 151, a second node group selection unit 152, an old and new key information request unit 153, a draft contract preparation unit 154, a signature request unit 155, a first signature execution unit 156, and a registration unit 157; each second node 2 comprises an old and new key information transmission unit 251, a second signature execution unit 252, and a draft contract return unit 253; the draft contract preparation unit 154 randomly determines the order of new public keys as transmission destinations; and the signature request unit 155 and the first signature execution unit 156 perform signature request and execution, respectively, so that the order of the nodes that sign a draft transaction contract is random.