Abstract: A communication apparatus configured to acquire information in a distributed ledger shared in a network, the communication apparatus includes a memory; and a processor coupled to the memory and configured to acquire one or more digital certificates used by a user of another apparatus to apply to the communication apparatus from the other apparatus, acquire type information that identifies a combination of the user and the type of information certified by the one or more digital certificates, by using the distributed ledger, acquire certificate issue history that is recorded in the distributed ledger in association with the type information, and determine whether the issue history contains information of another digital certificate that has not been acquired from the other apparatus.

Abstract: The power control unit sets a drive interval for driving the sensor by providing power intermittently to the sensor to a first time interval when no change is detected in the sine-wave signal and the cosine-wave signal, sets to the second time interval that is shorter than the first time interval when a change in only one of the sine-wave signal and the cosine-wave signal is detected, and sets to the third time interval that is shorter than the second time interval when a change in one of the sine-wave signal and the cosine-wave signal is detected and then a change in the other is detected.

Abstract: A non-transitory computer-readable storage medium storing a transmission support program that causes at least one computer to execute a process, the process includes generating a management identifier of a message in response to reception of the message; returning the management identifier to a transmitter of the message; when receiving the management identifier and lists of personal identifiers of individuals who have attributes according to conditions regarding the attributes, from each of a plurality of companies that holds information on the attributes of the individuals, based on reception of the conditions and the management identifier from the transmitter, specifying the personal identifiers that are duplicate between the lists that have the management identifier that is common; and transmitting the specified personal identifiers and the received message.

Abstract: A communication method is used in a communication system that includes a plurality of nodes. Two or more authentication nodes among the plurality of nodes respectively receive account information of a user and a public key of the user from the user. The two or more authentication nodes respectively transmit a massage that indicates the account information is correct and the public key of the user to the plurality of nodes when it is decided that the account information is correct. Each of the plurality of nodes registers the public key of the user in a public key list that stores public keys of users who have been allowed to participate in the communication system, when detecting according to messages received from other nodes that a specified number of authentication nodes or more have decided that the account information is correct.

Abstract: The power control unit sets a drive interval for driving the sensor by providing power intermittently to the sensor to a first time interval when no change is detected in the sine-wave signal and the cosine-wave signal, sets to the second time interval that is shorter than the first time interval when a change in only one of the sine-wave signal and the cosine-wave signal is detected, and sets to the third time interval that is shorter than the second time interval when a change in one of the sine-wave signal and the cosine-wave signal is detected and then a change in the other is detected.

Abstract: A rotation angle detection device including: an angular position calculation unit configured to calculate angular position information representing an angular position of the motor rotation shaft based on a first sensor signal of the first sensor; an rotation number detection unit configured to detect a rotation number of the motor rotation shaft based on a second sensor signal of a second sensor and outputs rotation number information representing the rotation number; a rotation angle calculation unit configured to calculate rotation angle information indicating a rotation angle of the motor rotation shaft based on the angular position information and the rotation number information; and a power supply unit configured to stop supplying power to the first sensor, the angular position calculation unit and the rotation angle calculation unit and to supply power to the second sensor and the rotation number detection unit when the power switch is off.

Abstract: According to one embodiment, a reading device is configured to read information from an RFID tag attached to a product. The reading device includes a housing, an antenna, an opening-and-closing lid, a detector, a reading unit, and an alert unit. The housing includes an opening portion, and therein a space for accommodating the product. The antenna is provided within the space. The opening-and-closing lid is opening and closing the opening portion. The detector is configured to detect an open or closed state of the opening-and-closing lid. The reading unit is configured to read the information from the RFID tag. The alert unit is configured to issue an alert on an operation method in accordance with the open or closed state of the opening-and-closing lid and an operation state of the reading unit.

Abstract: The power control unit sets a drive interval for driving the sensor by providing power intermittently to the sensor to a first time interval when no change is detected in the sine-wave signal and the cosine-wave signal, sets to the second time interval that is shorter than the first time interval when a change in only one of the sine-wave signal and the cosine-wave signal is detected, and sets to the third time interval that is shorter than the second time interval when a change in one of the sine-wave signal and the cosine-wave signal is detected and then a change in the other is detected.

Abstract: The power management unit supplies first power that is continuous power to the second sensor when the power switch is on, supplies second power that is intermittent power having a voltage lower than the first power to the second sensor when the power switch is off, and outputs rotation number information representing a rotation number of the motor rotation shaft based on the second sensor signal. The power management unit includes a comparator that operates using the second power as the power source when the power switch is off and compare the second sensor signal and the reference voltage, and a counter that detects the rotation number of the motor rotation shaft by counting the output of the comparators.

Abstract: A non-transitory computer-readable storage medium storing a program that causes a computer to execute a process, the process includes receiving a certification of a first communication device from a second communication device which issues the certification to the first communication device; receiving, from the second communication device, policy information which indicates whether the certificate is permitted to be sent; when the first communication device requests that the certificate be sent to the third communication device, determining whether the certificate is permitted to be sent to the third communication device, the third communication device requesting the first communication device to send the certificate; when determining that the certificate is permitted to be sent to the third communication device, sending, to the third communication device, the certificate.

Abstract: A control device that controls a transfer device, includes a memory and a processor coupled to the memory and configured to evaluate, for each of a plurality of processing rules to be used to process a packet in the transfer device, a processing load caused upon identification of a packet matching the processing rule, based on the type of an application requirement identifying the packet to which the processing rule is applied, generate, as a table to be used by the transfer device, a rule table storing the plurality of processing rules in order from the lowest processing load to the highest processing load, and transmit, to the transfer device, a control packet to request the transfer device to set the rule table.

Abstract: A relay device includes a communicator configured to transmit and receive a message to and from the communication device, and a processor configures to acquire a public key of a communication device that is a transmission source of the message from the node and authenticates a signature included in the message with the acquired public key, wherein the processor causes, when receiving a communication message including communication data to be transmitted to a second communication device by a first communication device, the processor to perform authentication on the communication message, and the communicator transmits the communication message to the second communication device when the authentication is successful.

Abstract: A communication apparatus configured to acquire information in a distributed ledger shared in a network, the communication apparatus includes a memory; and a processor coupled to the memory and configured to acquire one or more digital certificates used by a user of another apparatus to apply to the communication apparatus from the other apparatus, acquire type information that identifies a combination of the user and the type of information certified by the one or more digital certificates, by using the distributed ledger, acquire certificate issue history that is recorded in the distributed ledger in association with the type information, and determine whether the issue history contains information of another digital certificate that has not been acquired from the other apparatus.

Abstract: A communication device includes circuitry configured to acquire a digital certificate including information associated with a first attribute from a first device coupled to any of a plurality of devices sharing a distributed ledger having recorded therein a correspondence between an attribute of user information included in the digital certificate and a definition of the attribute, receive a request for information associated with a second attribute from a second device coupled to any of the plurality of devices, acquire a first definition associated with the first attribute, and a second definition associated with the second attribute, from any of the plurality of devices, and transmit a digital certificate including information associated with the first attribute to the second device together with a message notifying that the first attribute and the second attribute have the same definition, when the first definition and the second definition match.

Abstract: A non-transitory computer-readable recording medium stores therein a communication program for causing a communication apparatus which participates in a data distribution network to execute a process including: generating history information of transactions by analyzing a distributed ledger that is shared among apparatuses which participate in the data distribution network, and that records information of the transactions having been performed through the data distribution network; calculating credit-worthiness of each of users who has performed transactions through the data distribution network, by using the history information; and transmitting the calculated credit-worthiness, in response to a request from a terminal configured to perform transactions via the communication apparatus, to the terminal.

Abstract: A communication method is used in a communication system that includes a plurality of nodes. Two or more authentication nodes among the plurality of nodes respectively receive account information of a user and a public key of the user from the user. The two or more authentication nodes respectively transmit a massage that indicates the account information is correct and the public key of the user to the plurality of nodes when it is decided that the account information is correct. Each of the plurality of nodes registers the public key of the user in a public key list that stores public keys of users who have been allowed to participate in the communication system, when detecting according to messages received from other nodes that a specified number of authentication nodes or more have decided that the account information is correct.

Abstract: A communication device provides data to a data acquiring node based on a consensus of a plurality of participating nodes. The communication device includes a processor. The processor divides the data into N data components. N is an integer equal to or larger than two. When the N data components are stored in different storage areas, the processor encrypts addresses of storage areas in which the data components are respectively stored with respective public keys of N participating nodes among the plurality of participating nodes. The processor transmits access right information that indicates the data acquiring node has a right to access the data and the encrypted N addresses to the plurality of participating nodes.

Abstract: A control device that controls a transfer device, includes a memory and a processor coupled to the memory and configured to evaluate, for each of a plurality of processing rules to be used to process a packet in the transfer device, a processing load caused upon identification of a packet matching the processing rule, based on the type of an application requirement identifying the packet to which the processing rule is applied, generate, as a table to be used by the transfer device, a rule table storing the plurality of processing rules in order from the lowest processing load to the highest processing load, and transmit, to the transfer device, a control packet to request the transfer device to set the rule table.

Abstract: A communication device including a memory, and a processor coupled to the memory and the processor configured to determine a transmission order such that at least one of a maximum value of a common key generation time from among two or more communication devices and a number of times of key generation processing by the two or more communication devices becomes a minimum value, instruct another communication device from among the two or more communication devices to transmit a partial key in accordance with the transmission order determined, and transmit a partial key generated, in accordance with the determined transmission order.

Abstract: A firewall control device controls a plurality of firewall devices provided between a core network and a plurality of sub-networks respectively, the firewall control device is configured to receive, from the plurality of firewall devices, data amount information indicating an amount of the data discarded in the plurality of firewall devices respectively and node information indicating a transmission source node of the discarded data, identify, based on the data amount information and the node information, a data flow including the discarded data which is transmitted from an information processing device indicated by the node information and of which total amount of the discarded data exceeds a threshold value, and set, in a first firewall device which is included in the plurality of firewall devices and which is coupled to the information processing device, a first discarding flow entry defining discarding of data of the identified data flow.