Tohoku University

Denso Corporation

Panasonic Corporation

Junya Iwazaki

Masao Sakai

Shingo Hasegawa

Eisuke Koizumi

Shuji Isobe

Masayuki Fukumitsu

Yuji Unagami

Natsume Matsuzaki

Yuichi Futa

Tsuneo Nakata

Hiroki Shizuya

Daiki Takahashi

Naoki Iwata

Masashi Hisai

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.

Information intermediating apparatus, information providing apparatus, and information acquiring apparatus

An information processing systemcomprising at least one first node, second nodesfor providing a public key change assistance service, and a blockchain, wherein the first nodecomprises a new public key creation unit, a second node group selection unit, an old and new key information request unit, a draft contract preparation unit, a signature request unit, a first signature execution unit, and a registration unit; each second nodecomprises an old and new key information transmission unit, a second signature execution unit, and a draft contract return unit; the draft contract preparation unitrandomly determines the order of new public keys as transmission destinations; and the signature request unitand the first signature execution unitperform signature request and execution, respectively, so that the order of the nodes that sign a draft transaction contract is random.

Information processing system, method for changing public key, program, and method for building information processing system

An information processing systemincludes a client nodeand an issuing nodefor issuing a coupon having terms of use Q. The client nodeincludes a use request unitthat requests to use the coupon by presenting user data D held by a user of the client node. The issuing nodeincludes: a use request verification unitfor verifying whether the information included in the user data D satisfies the terms of use Qupon the use request from the use request unit; and a use authorization unitthat authorizes the client nodeto use the coupon when the information satisfies the terms of use Q

Information processing system, method for providing service data, and method for building information processing system

An information processing system including multiple memory devices and a processor configured to select one node group associated with a time point included in a time period between a current time point and a time point before a predetermined time including the current time point among multiple node groups each associated with one of multiple time points, and store the N pieces of distributed data one to each of N memory devices included in the selected node group. The information processing system carries out a restoring process on at least one of the multiple node groups, and if the restoring results in failure, carries out the restoring process on a second node group associated with a time point before a time point associated with the first node group that causes the failure among the plurality of node groups.

Information processing system, information processing apparatus, method for information processing, and non-transitory computer-readable recording medium having stored therein information processing program

The present invention aims to perform tamper detection on a protection control module without having detection modules come to know the key data and functions thereof. The detection modules of the present invention perform tamper detection by verifying whether or not the correspondence between the input and output data of the application decryption process performed by the protection control module is correct. Furthermore, the present invention offers improved security against leaks of the application output data by the detection modules by having a plurality of detection modules verify different data blocks.

Method and device that verifies application program modules

Growing community of inventors

Sendai, Japan

Junya Iwazaki