Nec Corporation

Nec C Orporation

Takahiro Kakumaru

Shinichi Morimoto

Yuya Yamada

Hideki Kurokawa

Naoki Sasamura

Takaaki Ohara

The rule learning unitperforms rough sets analysis using training data that includes threat information including a plurality of explanatory variables representing a threat event and a discrimination result of discriminating the threat information, to learn a decision rule specifying the discrimination result depending on a combination of the explanatory variables. The input unitinputs the threat information to be analyzed. The analysis unitapplies the input threat information to the decision rule to identify the discrimination result of the threat information, and the explanatory variable as a basis for the discrimination result.

Threat analysis system, threat analysis device, threat analysis method and threat analysis program

Provided is a security system or the like with which security can be improved. A security system according to one embodiment of the present invention is provided with: a packet reception means that receives a request from an intruding device that is attempting intrusion; a dummy resource characteristic information storage means that stores characteristic information for a plurality of virtual dummy resources; a dummy response generation means that generates a dummy response on the basis of the characteristic information in response to the request directed to the dummy resource; a dummy response transmission control means that controls a request end flag, which indicates the presence/absence of untransmitted dummy resources, on the basis of a timer value; and a dummy response transmission means that, on the basis of the request end flag, transmits the dummy response to the intruding device that transmits the request.

Network security system, method, recording medium and program for preventing unauthorized attack using dummy response

Provided is a security system or the like with improved security. A security system according to one embodiment of the present invention is provided with: a packet reception means that receives a request from an intruding device that is attempting intrusion; a dummy resource characteristic information storage means that stores characteristic information for a plurality of virtual dummy resources; a dummy resource operation management means that manages whether or not to operate the dummy resources on the basis of the characteristic information; a dummy resource management means that determines whether or not the dummy resources which are virtually operated by the operation management means should respond that said resources are present; a dummy response generation means that, for each dummy resource that the dummy resource management means has determined should respond, generates a dummy response on the basis of the characteristic information in response to the request directed to the dummy resource; and a dummy response transmission means that transmits the dummy response to the intruding device.

Security system, security method, and recording medium for storing program

A communication device selects a layer 2 address to be changed, and transmits a presence check request message via a network to which the communication device is connected. The communication device determines, based on a received result of the presence check request message, whether the layer 2 address is duplicated with another communication device connected to the network. When the communication device confirms the layer 2 address is not duplicated, the communication device changes the layer 2 address of the communication device.

Communication device, communication method and communication control program

A wireless communication terminal () which performs handover control of wireless base stations acquires a layer 2 address concerning a new wireless base station () from a wireless communication interface unit (A) before handover. A presence confirmation request transmitting unit (D) transmits a presence confirmation request message to the layer 2 address acquired by an address acquisition unit (B) via a currently connected wireless base station (). Based on the presence confirmation response message reception result of a presence confirmation response receiving unit (E), a subnet determination unit (F) determines whether the new wireless base station () belongs to the same subnet as that of the wireless communication terminal ().

Wireless communication terminal, method, program, recording medium, and wireless communication system

The object is to prevent a third party from specifying a condition of data communication executed by a radio terminal in a radio network using a radio communication device easily accessible to anyone such as WLAN. The radio base stationcomprises a unit which determines whether to transmit a pseudo data frame assumed to be actual data communication according to a condition of data communication with the radio terminaland a unit which stores information which is information for generating a pseudo data frame and based on actual data communication with the radio terminal, thereby generating and transmitting a pseudo data frame based on the stored information when starting pseudo data frame transmission.

Communication device, communication system, communication method and communication program

A wireless communication terminal includes a first detecting section for detecting whether or not a reception signal level indicating a level of a received signal from a base station currently in connection as the first base station reduces to be equal to or lower than a first threshold level, a second detecting section for detecting whether or not a communication situation of a communication application program currently in communication is a situation suitable for handover, a third detecting section for detecting whether or not a predetermined handover forcedly performing condition is established, a determining section for determining whether or not the handover control is necessary, based on detection results of the first to third detecting section, and a communication control section for performing a handover control to switch from the first base station to a second base station when the switching to the handover control is necessary.

Wireless communication terminal, wireless communication network system and handover timing determining method

A radio terminal unit and a radio communication system, enabling power savings, the improvement of the quality of real-time communication such as voice communication, and the reduction of transmission delays which often occur when a plurality of radio terminal units are connected to one radio base station. A radio terminal unit comprises an operation mode of communication application determination unit for determining operation mode of one or more communication which is operated at the radio terminal unit, a control packet changing unit for changing a timing of transmission of the control packet according to the operation mode of one or more communication applications determined by the operation mode of communication application determination unit, and a communication control section for sending the control packet according to the timing of transmission changed by the control packet changing unit after the transmission of data from the application.

Radio terminal unit, radio communication system and communication control method

A radio terminal unit and a radio communication system, enabling power savings, the improvement of the quality of real-time communication such as voice communication, and the reduction of transmission delays which often occur when a plurality of radio terminal units are connected to one radio base station. A radio terminal unit comprises a communication control section for controlling a radio interface section to transmit a control packet using a timer value.

A radio terminal and a radio communication system using the same, which enables power saving, the improvement of the quality of real-time communication such as voice communication, and a reduction of packet delay. An intermittent receiving interval for each radio terminal is set according to the operation mode of each application running on the radio terminal. Consequently, the intermittent receiving interval can be changed in cooperation with the operation mode of each application. Thus, power-saving control for the radio terminal can be carried out precisely. In addition, the radio terminal can assign priorities to data transmitted from the radio base station. The priorities are set according to the operation mode of each application running on the radio terminal, and the packets of real-time communication can be transmitted preferentially.

Radio terminal and radio communication system using same

There is provided a wireless communication system including a radio-signal base station, and a mobile wireless terminal operating in a power-saving mode in which the mobile wireless terminal intermittently receives packet signals, and in a normal mode in which the mobile wireless terminal regularly receives packet signals. When the radio-signal base station receives packet signals addressed to a mobile wireless terminal being in the power-saving mode, the radio-signal base station temporarily stores the received packet signals. The mobile wireless terminal requests the radio-signal base station to transmit the packet signals thereto, receives a part of the packet signal from the radio-signal base station, and, if the mobile wireless terminal judges that it would be necessary to carry out real-time communication for receiving entirety of the packet signals, the mobile wireless terminal transfers to the normal mode from the power-saving mode for receiving entirety of the packet signals.

Wireless communication system and method of making wireless communication

A radio terminal unit and a radio communication system, enabling power savings, the improvement of the quality of real-time communication, and the reduction of transmission delays. An operation mode determination section determines whether real-time processing is necessary or unnecessary based on parameters of all active communication applications set by a communication application section. When real-time processing is necessary, a communication control section transmits a PS-Poll as a control packet for requesting delivery of packets to a radio base station, and turns on the power of a radio interface section so as to receive packets buffered by the radio base station. When real-time processing is unnecessary, the communication control section turns off the power of the radio interface section, and carries out intermittent receiving operation based on beacons transmitted from the radio base station.

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Tokyo, Japan

Takahiro Kakumaru