Abstract: A communication apparatus includes a processor and a memory. The memory is configured to store computer-readable instructions that, when executed, instruct the communication apparatus to execute steps comprising acquiring a type of transmission data referring to information about the transmission data, and limiting a search range of a network bandwidth, in response to the acquired type of the transmission data, wherein the network bandwidth is measured by a transmission interval of a transmission of a plurality of packets via a network, and a reception interval of a reception of the plurality of packets via a network. The memory is configured to store computer-readable instructions that further instruct the communication apparatus to execute steps comprising setting the search range according to the limited search range, and transmitting a packet within the limited search range for measuring the network bandwidth.

Abstract: An encrypted-traffic discrimination device includes an input interface, a flow discrimination section, a data accumulation section, a selective data calculation section, a calculation result determination section, and an output interface. The flow discrimination section discriminates the input traffic into separate flows based on at least a transmission origin address and a transmission destination address. The data accumulation section accumulates characteristic amount data of the traffic for each of the separate flows. The selective data calculation section executes an evaluation computation utilizing specific data from the characteristic amount data. The calculation result determination section that, based on a calculated evaluation computation value, executes threshold value determination to determine whether or not the traffic is encrypted, and, if the traffic is determined to be encrypted, which encryption format the traffic is encrypted with.

Abstract: A communication apparatus may comprise a processor and a memory. The memory is configured to store computer-readable instructions that, when executed, instruct the communication apparatus to execute steps comprising acquiring a type of transmission data referring to information about the transmission data, and limiting a search range of a network bandwidth, in response to the acquired type of the transmission data, wherein the network bandwidth is measured by a transmission interval of a transmission of a plurality of packets via a network, and a reception interval of a reception of the plurality of packets via a network. The memory is configured to store computer-readable instructions that further instructs the communication apparatus to execute steps comprising setting the search range according to the limited search range, and transmitting a packet within the limited search range for measuring the network bandwidth.

Abstract: An encrypted-traffic discrimination device includes an input interface, a flow discrimination section, a data accumulation section, a selective data calculation section, a calculation result determination section, and an output interface. The flow discrimination section discriminates the input traffic into separate flows based on at least a transmission origin address and a transmission destination address. The data accumulation section accumulates characteristic amount data of the traffic for each of the separate flows. The selective data calculation section executes an evaluation computation utilizing specific data from the characteristic amount data. The calculation result determination section that, based on a calculated evaluation computation value, executes threshold value determination to determine whether or not the traffic is encrypted, and, if the traffic is determined to be encrypted, which encryption format the traffic is encrypted with.