Abstract: A communication device according to the present invention includes: a memory; and at least one processor coupled to the memory. The processor performs operations. The operations includes: storing device information that is information stored commonly in one or more communication devices; generating clock information representing timing by using a periodic clock signal; selecting at least a part of the device information according to the clock information; generating selection information that is different information for each piece of the clock information from at least a part of the device information selected; generating an encryption key by using at least the clock information and the selection information generated; and executing at least one of encryption processing and decryption processing on communication data by using the encryption key generated.

Abstract: A processor (103) in a wireless terminal (10) executes a communication service application to thereby perform an operation as a client for using a communication service. Further, in an abnormal situation where the wireless terminal (10) cannot access a server system (50) of an operator of the communication service, the processor (103) executes a predetermined activation procedure in the wireless terminal (10) without passing through the server system (50) to thereby activate a special account in the wireless terminal (10). This makes it possible, for example, to perform communication by the special account using an online service application installed in the wireless terminal during an abnormal situation where the wireless terminal cannot access the online service server.

Abstract: A node in a DTN includes: a memory; and a processor coupled to the memory and configured to execute data transfer processing for the DTN, wherein the data transfer processing including: receiving a plurality of bundles to be transferred to a same destination node on the DTN, each of the plurality of bundles including any one of a plurality of data segments acquired by dividing data of a content; deleting a part of the bundles from among the plurality of bundles without transferring to any other node or compressing a data size of a payload of the part of the bundles in accordance with a communication status of the DTN; and transmitting either a rest of the bundles excluding the deleted part of the bundles or the plurality of bundles including the part of the bundles having the compressed payloads to the DTN for transmitting to the destination node.

Abstract: A wireless terminal device (1) for use in a store-and-forward type wireless network includes a wireless communication unit (11), a memory (12), and a control unit (13). The memory (12) is coupled to the wireless communication unit (11) and is configured to store messages transferred via the wireless network. The control unit (13) is configured to adjust, based on first information, at least one of a maximum number and maximum retention time of messages stored in the memory (12). The first information relates to a degree of contribution of the wireless terminal device (1) to success in sending messages from a source node to a destination node via the wireless network. It is thus possible to provide, for example, an efficient memory control method suitable for a store-and-forward type wireless network.

Abstract: A node in a DTN includes: a memory; and a processor coupled to the memory and configured to execute data transfer processing for the DTN, wherein the data transfer processing including: receiving a plurality of bundles to be transferred to a same destination node on the DTN, each of the plurality of bundles including any one of a plurality of data segments acquired by dividing data of a content; deleting a part of the bundles from among the plurality of bundles without transferring to any other node or compressing a data size of a payload of the part of the bundles in accordance with a communication status of the DTN; and transmitting either a rest of the bundles excluding the deleted part of the bundles or the plurality of bundles including the part of the bundles having the compressed payloads to the DTN for transmitting to the destination node.

Abstract: A communication device according to the present invention includes: a memory; and at least one processor coupled to the memory. The processor performs operations. The operations includes: storing device information that is information stored commonly in one or more communication devices; generating clock information representing timing by using a periodic clock signal; selecting at least a part of the device information according to the clock information; generating selection information that is different information for each piece of the clock information from at least a part of the device information selected; generating an encryption key by using at least the clock information and the selection information generated; and executing at least one of encryption processing and decryption processing on communication data by using the encryption key generated.

Abstract: A communication device according to the present invention includes: a memory; and at least one processor coupled to the memory. The processor performs operations. The operations includes: according to synchronization accuracy representing a frequency of timings at which a cryptosystem used for encryption communication between the communication device and another communication device can be changed, selecting the cryptosystem with different processing load on cryptographic processing in the encryption communication; and executing at least one of encryption processing and decryption processing on communication data with the another communication device by using the cryptosystem selected.

Abstract: A node in a DTN includes: a memory; and a processor coupled to the memory and configured to execute data transfer processing for the DTN, wherein the data transfer processing including: receiving a plurality of bundles to be transferred to a same destination node on the DTN, each of the plurality of bundles including any one of a plurality of data segments acquired by dividing data of a content; deleting a part of the bundles from among the plurality of bundles without transferring to any other node or compressing a data size of a payload of the part of the bundles in accordance with a communication status of the DTN; and transmitting either a rest of the bundles excluding the deleted part of the bundles or the plurality of bundles including the part of the bundles having the compressed payloads to the DTN for transmitting to the destination node.

Abstract: A processor (102) implemented in a wireless terminal (1) is configured to perform gateway processing by executing a first application program (34) stored in a memory (19). The gateway processing includes: (a) receiving transmission data of other application programs (31-33); (b) selecting, from a plurality of communication interfaces (51-55), at least one communication interface to which the transmission data is to be transmitted; and (c) sending the transmission data to the selected at least one communication interface. This contributes, for example, to allowing an application program to easily communicate via a communication interface (i.e., communication path) conforming to a communication protocol that is additionally installed on a wireless terminal (e.g., smartphone).

Abstract: A radio wave jamming system (1) comprises a plurality of radio transmitters (10) that are adapted to transmit respective jamming signals (11) including substantially the same frequency. The plurality of radio transmitters (10) are further adapted to temporally change at least one of the transmission phases of the jamming signals (11), which are to be transmitted from the plurality of radio transmitters (10), so as to temporally change the phase differences among the jamming signals (11) when the jamming signals (11) transmitted from the plurality of radio transmitters (10) arrive at a particular site (50). Thus, for example, a radio wave jamming system that can be constituted by small-output radio devices can be provided.

Abstract: A processor (103) in a wireless terminal (10) executes a communication service application to thereby perform an operation as a client for using a communication service. Further, in an abnormal situation where the wireless terminal (10) cannot access a server system (50) of an operator of the communication service, the processor (103) executes a predetermined activation procedure in the wireless terminal (10) without passing through the server system (50) to thereby activate a special account in the wireless terminal (10). This makes it possible, for example, to perform communication by the special account using an online service application installed in the wireless terminal during an abnormal situation where the wireless terminal cannot access the online service server.

Abstract: A processor (102) implemented in a wireless terminal (1) is configured to perform gateway processing by executing a first application program (34) stored in a memory (19). The gateway processing includes: (a) receiving transmission data of other application programs (31-33); (b) selecting, from a plurality of communication interfaces (51-55), at least one communication interface to which the transmission data is to be transmitted; and (c) sending the transmission data to the selected at least one communication interface. This contributes, for example, to allowing an application program to easily communicate via a communication interface (i.e., communication path) conforming to a communication protocol that is additionally installed on a wireless terminal (e.g., smartphone).

Abstract: A node in a DTN includes: a memory; and a processor coupled to the memory and configured to execute data transfer processing for the DTN, wherein the data transfer processing including: receiving a plurality of bundles to be transferred to a same destination node on the DTN, each of the plurality of bundles including any one of a plurality of data segments acquired by dividing data of a content; deleting a part of the bundles from among the plurality of bundles without transferring to any other node or compressing a data size of a payload of the part of the bundles in accordance with a communication status of the DTN; and transmitting either a rest of the bundles excluding the deleted part of the bundles or the plurality of bundles including the part of the bundles having the compressed payloads to the DTN for transmitting to the destination node.

Abstract: A radio wave jamming system (1) comprises a plurality of radio transmitters (10) that are adapted to transmit respective jamming signals (11) including substantially the same frequency. The plurality of radio transmitters (10) are further adapted to temporally change at least one of the transmission phases of the jamming signals (11), which are to be transmitted from the plurality of radio transmitters (10), so as to temporally change the phase differences among the jamming signals (11) when the jamming signals (11) transmitted from the plurality of radio transmitters (10) arrive at a particular site (50). Thus, for example, a radio wave jamming system that can be constituted by small-output radio devices can be provided.

Abstract: A wireless terminal device (1) for use in a store-and-forward type wireless network includes a wireless communication unit (11), a memory (12), and a control unit (13). The memory (12) is coupled to the wireless communication unit (11) and is configured to store messages transferred via the wireless network. The control unit (13) is configured to adjust, based on first information, at least one of a maximum number and maximum retention time of messages stored in the memory (12). The first information relates to a degree of contribution of the wireless terminal device (1) to success in sending messages from a source node to a destination node via the wireless network. It is thus possible to provide, for example, an efficient memory control method suitable for a store-and-forward type wireless network.

Abstract: Sounding a buzzer a plurality of times can be controlled with few commands, the processor load is reduced when sounding the buzzer, and the buzzer can be sounded at the desired timing. A printer 1 having a buzzer 40 receives print data containing four types of data, a print configuration command A, a buzzer configuration command B, a printing control command C, and a stop printing command D, from a host device 2. The buzzer configuration command B is a command that sets the conditions and method of sounding the buzzer 40. The buzzer configuration command B sets the new page command C2 as the command that triggers sounding the buzzer 40 from among commands and data contained in the printing control command. When the control unit 10 of the printer 1 detects the new page command C2 while executing a print job, the control unit 10 causes the buzzer 40 to sound at the specified timing in the new page process.

Abstract: In a hybrid vehicle including an engine; a generator for generating electrical power from the engine; a battery charged with electrical power generated by the generator; and a motor driven by electrical power generated by the generator or by electrical power output by the battery, and with a view to reducing energy consumption from the battery without using complicated control operations while preventing overcharging of the battery, the hybrid vehicle further includes a motoring control unit for starting motoring, i.e., mechanical driving of the engine, in addition to regenerative power generation when a state of charge of the battery reaches a first set value and stopping the motoring of the engine when the state of charge of the battery reaches a second set value.

Abstract: Sounding a buzzer a plurality of times can be controlled with few commands, the processor load is reduced when sounding the buzzer, and the buzzer can be sounded at the desired timing. A printer 1 having a buzzer 40 receives print data containing four types of data, a print configuration command A, a buzzer configuration command B, a printing control command C, and a stop printing command D, from a host device 2. The buzzer configuration command B is a command that sets the conditions and method of sounding the buzzer 40. The buzzer configuration command B sets the new page command C2 as the command that triggers sounding the buzzer 40 from among commands and data contained in the printing control command. When the control unit 10 of the printer 1 detects the new page command C2 while executing a print job, the control unit 10 causes the buzzer 40 to sound at the specified timing in the new page process.