Packet format inference apparatus and computer readable medium
AssigneeMitsubishi Electric Corporation
InventorsKeisuke KITO, Takumi YAMAMOTO, Hiroki NISHIKAWA, Kiyoto KAWAUCHI
Life of this patent
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Abstract
A packet format inference apparatus includes a classification unit and an inference unit. The classification unit classifies, among a plurality of packets which are included in a packet data set as packet data and of which formats are unknown, relevant packets transmitted in a fixed cycle, as a packet group having a same arrival cycle. The inference unit infers a packet format for each packet group having the same arrival cycle.
Claims12
A packet format inference apparatus comprising:
- processing circuitry
- to classify, among a plurality of packets that have arrived, relevant packets transmitted in a fixed cycle, as a packet group having a same arrival cycle;
- and
- to infer a packet format for each packet group having the same arrival cycle.
The packet format inference apparatus according to claim
- the processing circuitry
- selects one packet among the plurality of packets as a sample, calculates a value obtained by subtracting, from a value common to each packet, a hamming distance between the sample and each packet included in at least a portion of the packets among the plurality of packets, and generates first time series data indicating the value that has been calculated, as an amplitude corresponding to an arrival time of each packet;
- performs frequency transformation of the first time series data generated and output a first frequency spectrum;
- extracts, from the first frequency spectrum output, frequency component corresponding to the fixed cycle and output a second frequency spectrum;
- and
- performs inverse frequency transformation of the second frequency spectrum output and output second time series data,
- wherein the processing circuitry identifies the relevant packets by referring to the second time series data output.
A computer readable medium having a packet format inference program to cause a computer to execute:
- a process of classifying, among a plurality of packets that have arrived, relevant packets transmitted in a fixed cycle, as a packet group having a same arrival cycle;
- and
- a process of inferring a packet format for the packet group having the same arrival cycle.
Dependencies are inferred from the claim text.