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 d

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.

Abstract: An information processing system 100 includes a client node 1 and an issuing node 2 for issuing a coupon having terms of use Q1. The client node 1 includes a use request unit 155 that requests to use the coupon by presenting user data D held by a user of the client node 1. The issuing node 2 includes: a use request verification unit 253 for verifying whether the information included in the user data D satisfies the terms of use Q1 upon the use request from the use request unit 155; and a use authorization unit 254 that authorizes the client node 1 to use the coupon when the information satisfies the terms of use Q1.

Abstract: An information processing system 100 includes a client node 1 and an issuing node 2 for issuing a coupon having terms of use Q1. The client node 1 includes a use request unit 155 that requests to use the coupon by presenting user data D held by a user of the client node 1. The issuing node 2 includes: a use request verification unit 253 for verifying whether the information included in the user data D satisfies the terms of use Q1 upon the use request from the use request unit 155; and a use authorization unit 254 that authorizes the client node 1 to use the coupon when the information satisfies the terms of use Q1.

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.

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.

Abstract: 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.

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 d

Abstract: 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.

Abstract: 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.

Abstract: 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.