KEY STORAGE DEVICE, KEY STORAGE METHOD, AND PROGRAM

摘要

In a system in which multiple sensor nodes is distributed and communication using an encryption key is carried out between the respective distributed nodes, a key necessary for communication is flexibly specified and stored for each node even if node arrangement is irregular or if multiple distribution methods are used in combination. An area dividing unit 611 divides a node distribution target space which is a target of node distribution into predetermined sub-spaces; a key generating unit 612 generates the same number of keys as the number of the sub-spaces; the sub-spaces and the keys are made corresponding and stored in a key pool memory region 613; an arrangement sampling unit 614 predicts an arranged point of each node based on a probability density function, selects one of the sub-spaces located within a communicable range from the predicted arranged point of each node, specifies the key assigned to the selected sub-space, and repeats the same process until a predetermined number of keys are specified for one node; and a key writing unit 615 writes the keys specified by the arrangement sampling unit 614 in the node.