Key storage device, key storage method, and program

A technology for saving devices and keys, applied to key distribution, can solve the problems of not saving keys, reducing the efficiency of network formation, and being unable to flexibly correspond to irregular distribution points or multiple distribution methods, and to achieve network effect

Inactive Publication Date: 2008-01-16
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the case of irregular scattering points or when multiple scattering methods are used together, the existing method cannot flexibly respond to irregular scattering points or multiple scattering methods, and occurs when nodes do not have There is a problem that the efficiency of network formation 103 is lowered in the case of saving the key necessary for communication with nearby nodes

Method used

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  • Key storage device, key storage method, and program
  • Key storage device, key storage method, and program
  • Key storage device, key storage method, and program

Examples

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Embodiment approach 1

[0064] First, the content of this embodiment will be briefly described.

[0065] In the present embodiment, the ground surface of the area to be distributed with nodes is divided into fine areas, and keys are distributed to each area on a computer. Next, the distributed node arrangement is predicted from a previously determined probability distribution (probability density function), and keys assigned to positions within a predetermined distance from the predicted position are stored in the nodes. The above processing is repeated for the necessary key amount, and the storage of the key for one node ends. Then, the same processing is performed for each node, and the overall processing is completed.

[0066] The main feature of this embodiment is that the key stored in the node is specifically determined by predicting the position where the node is scattered and the key distributed in advance by a computer at the position. As a result, the probability that two nodes that are p...

Embodiment approach 2

[0096] Fig. 13 shows an initial key storage / node that has two functions of storing keys to nodes and distributing them in a system where a large number of nodes are scattered in a certain area and a network is formed with each node to collect sensing information A block diagram of a configuration example of the distributing device 1801 . In addition, the initial key storage and node distribution device 1801 of this embodiment can be mounted on a mobile body such as a helicopter and moved, and can perform node distribution while moving.

[0097] In FIG. 13 , area division unit 611 , key generation unit 612 , key reserve storage area 613 , configuration sampling unit 614 , and key writing unit 615 are the same as those shown in Embodiment 1, and description thereof will be omitted.

[0098] The position obtaining unit 1811 is a unit for obtaining information on the spatial position of the initial key storage and node distribution device 1801, and can be realized using a position...

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Abstract

In a system where a plurality of sensor nodes are distributed and communication is performed between the distributed nodes by using an encryption key, a key required for communication is flexibly specified for each node and stored even when node arrangement is irregular or a plurality of distribution methods are used. An area dividing unit (611) divides a space as a node distribution object into predetermined small spaces. A key generation unit (612) generates an identical number of keys to the number of small spaces, causes a key pool storage area (613) to store the keys while correlating the small spaces to the keys. An arrangement sampling unit (614) predicts arrangement points of the respective nodes according to the probability density function, selects small spaces within a range communicable from the arrangement point of each predicted node, and specifies the key assigned for the selected small space as a storage object. This processing is repeated until a predetermined number of keys are specified for one node and a key write unit (615) writes the key specified by the arrangement sampling unit (614) in the node.

Description

technical field [0001] The present invention relates to a technique for storing an initial key in a system that measures temperature, detects air leaks, finds survivors, etc., collects environmental information, rescues at the time of a disaster, etc., using distributed sensor nodes. Multiple sensor nodes that fail to correctly determine the location of the setup communicate securely. Background technique [0002] In a sensor network composed of a large number of sensor nodes (hereinafter, simply referred to as nodes), ensuring the security of communication between nodes is a problem. Therefore, encrypted communication using an encryption key (hereinafter simply referred to as a key) stored in the node in advance is used. [0003] Fig. 15 is a graphic diagram of a system in which a large number of nodes are dispersed in a certain area and each node forms a network to collect sensory information. [0004] In FIG. 15 , in node generation 101, keys are stored in each node, in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/08
CPCH04L9/08H04L9/0894H04L2209/805
Inventor 伊藤隆米田健太田英宪
Owner MITSUBISHI ELECTRIC CORP
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