Abstract: A detecting device includes: a verification information acquiring unit (400) configured to acquire second verification information about block data recorded in a central server that generates and distributes block data configuring a block chain and first verification information about block data recorded in a plurality of participant servers that record the distributed block data in a ledger of each of the plurality of participant servers; and a comparison unit (401) configured to determine the presence or absence of tampering of the block data in the central server by comparing the first verification information with the second verification information.

Abstract: The integrated circuit includes a CPU configured to operate according to a program, a PUF information output unit configured to output PUF information while power is being supplied, a key pair output unit configured to output a public key and a private key based on the PUF information while power is being supplied, a public key transmitter configured to transmit the public key output from the key pair output unit to the outside, and a shared encryption key decryption unit configured to decrypt encrypted information produced through encryption with the public key and received from the outside with the private key output from the key pair output unit.

Abstract: A monitoring device is configured to monitor a monitoring target device. The monitoring device includes a circuit information distribution program configured to distribute circuit information for programming a physically unclonable function (PUF) circuit to the monitoring target device; a transmission processing program configured to transmit a challenge value to the monitoring target device to which circuit information is distributed; a reception processing program configured to receive a response value corresponding to the challenge value of the PUF circuit programmed in the monitoring target device; and an authentication processing program configured to authenticate the monitoring target device based on input and output correspondence information of the PUF circuit programmed in the monitoring target device and the response value which has been received.

Abstract: An information distribution device configured to distribute an encrypted update program to a control device connected through a wide-area communication network includes: a physically unclonable function (PUF) information acquiring unit configured to acquire PUF information of the control device recorded in advance; an additional information acquiring unit configured to specify and acquire any of a plurality of pieces of additional information recorded in advance; an encryption processing unit configured to encrypt protection target information based on the PUF information and the additional information that are acquired; and a transmission processing unit configured to transmit the encrypted update program to the control device, wherein the additional information acquiring unit is configured to change the additional information to be specified in accordance with a time.

Abstract: A monitoring device includes: a PUF-information acquiring unit acquiring PUF-information; a first PUF-information change value calculating unit calculating a degree of change from PUF-information acquired at a previous time to PUF-information acquired at a current time as a first PUF-information change value; a second PUF-information change value calculating unit calculating a degree of change from initial PUF-information to the PUF-information acquired at the current time as a second PUF-information change value; an unauthorized use determining unit comparing the first PUF-information change value with a first threshold and determining that there is unauthorized use of the predetermined monitoring target device when the first PUF-information change value is greater than the first threshold; and a deterioration determining unit comparing the second PUF-information change value with a second threshold and determining that the predetermined monitoring target device has deteriorated when the second PUF-informati

Abstract: A monitoring device includes: a PUF-information acquiring unit acquiring PUF-information; a first PUF-information change value calculating unit calculating a degree of change from PUF-information acquired at a previous time to PUF-information acquired at a current time as a first PUF-information change value; a second PUF-information change value calculating unit calculating a degree of change from initial PUF-information to the PUF-information acquired at the current time as a second PUF-information change value; an unauthorized use determining unit comparing the first PUF-information change value with a first threshold and determining that there is unauthorized use of the predetermined monitoring target device when the first PUF-information change value is greater than the first threshold; and a deterioration determining unit comparing the second PUF-information change value with a second threshold and determining that the predetermined monitoring target device has deteriorated when the second PUF-informati

Abstract: An information distribution device configured to distribute an encrypted update program to a control device connected through a wide-area communication network includes: a PUF information acquiring unit configured to acquire PUF information of the control device recorded in advance; an additional information acquiring unit configured to specify and acquire any of a plurality of pieces of additional information recorded in advance; an encryption processing unit configured to encrypt protection target information on the basis of the PUF information and the additional information that are acquired; and a transmission processing unit configured to transmit the encrypted update program to the control device, wherein the additional information acquiring unit is configured to change the additional information to be specified in accordance with a time.

Abstract: A monitoring device that is included in a monitoring system constituting a distributed ledger system and monitors a monitoring target device includes a circuit information distribution unit configured to distribute circuit information for forming a predetermined PUF circuit to the monitoring target device; a transmission processing unit configured to transmit a predetermined challenge value to the monitoring target device to which circuit information is distributed; a reception processing unit configured to receive a response value corresponding to the challenge value of the PUF circuit formed in the monitoring target device; and an authentication processing unit configured to authenticate the monitoring target device based on input and output correspondence information of the PUF circuit formed in the monitoring target device and the received response value.

Abstract: The integrated circuit includes a CPU configured to operate according to a program, a PUF information output unit configured to output PUF information while power is being supplied, a key pair output unit configured to output a public key and a private key based on the PUF information while power is being supplied, a public key transmitter configured to transmit the public key output from the key pair output unit to the outside, and a shared encryption key decryption unit configured to decrypt encrypted information produced through encryption with the public key and received from the outside with the private key output from the key pair output unit.

Abstract: A control arithmetic device controls so that an approval-receiving device displays a content of a new control program that the control arithmetic device received from the editing device. The approval-receiving device receives input of approval information that indicates whether a change of a control program is approved or not from an manager. The control arithmetic device changes the control program to the new control program in the case where the approval information received from the approval-receiving device indicates approval of the control program.

Abstract: A Plant safety design assistance device (100) is configured by a communication device (140), a diagnostics and monitoring device (110), a fault inspection management device (120), and a design and manufacturing device (130) being interconnected via network (150). The diagnostics and monitoring device (110) receives plant status information (dc) from a plant control system (1) and carries out monitoring and diagnostics an the plant. The fault inspection management device (120) maintains fault inspection information (D2) of an apparatus which is used in the plant. The design and manufacturing device (130) maintains design and manufacturing information of the apparatus which is used in the plant. The design and manufacturing devise (130) receives the fault inspection information (D2) from the fault inspection management device (120), and carries out a plant safety design which takes the fault inspection information into account.

Abstract: The reliability of output data is enhanced, and the frequency of stopping arithmetic devices is reduced. A redundant system includes an input device; a plurality of arithmetic devices that receive input data from the input device; and an output device that receives output data output from the arithmetic devices, the redundant system causing the arithmetic devices to perform the same processing. Each of the arithmetic devices includes: a first communication unit that acquires the input data from the input device; and a second communication unit that sends the input data acquired by the first communication unit to other arithmetic device and receives the input data acquired by the other arithmetic device from the other arithmetic device.

Abstract: A Plant safety design assistance device (100) is configured by a communication device (140), a diagnostics and monitoring device (110), a fault inspection management device (120), and a design and manufacturing device (130) being interconnected via network (150). The diagnostics and monitoring device (110) receives plant status information (dc) from a plant control system (1) and carries out monitoring and diagnostics an the plant. The fault inspection management device (120) maintains fault inspection information (D2) of an apparatus which is used in the plant. The design and manufacturing device (130) maintains design and manufacturing information of the apparatus which is used in the plant. The design and manufacturing devise (130) receives the fault inspection information (D2) from the fault inspection management device (120), and carries out a plant safety design which takes the fault inspection information into account.

Abstract: A control arithmetic device controls so that an approval-receiving device displays a content of a new control program that the control arithmetic device received from the editing device. The approval-receiving device receives input of approval information that indicates whether a change of a control program is approved or not from an manager. The control arithmetic device changes the control program to the new control program in the case where the approval information received from the approval-receiving device indicates approval of the control program.

Abstract: The reliability of output data is enhanced, and the frequency of stopping arithmetic devices is reduced. A redundant system includes an input device; a plurality of arithmetic devices that receive input data from the input device; and an output device that receives output data output from the arithmetic devices, the redundant system causing the arithmetic devices to perform the same processing. Each of the arithmetic devices includes: a first communication unit that acquires the input data from the input device; and a second communication unit that sends the input data acquired by the first communication unit to other arithmetic device and receives the input data acquired by the other arithmetic device from the other arithmetic device.