SENSOR NETWORK, SENSOR MANAGEMENT SERVER, KEY UPDATING METHOD AND KEY UPDATING PROGRAM

摘要

A sensor network includes a sensor management server which is mutually connected with many sensor terminals. The sensor management server includes: a key delivery module for transmitting a key update message to the respective sensor terminals; a communication volume detection module for detecting a communication volume used for transmitting the key update message; and a multiplicity determination module for specifying a numerical value as a multiplicity, which represents the lower limit number of key update messages transmitted to the respective sensor terminals, according to the detected communication volume. The multiplicity determination module specifies the multiplicity such that the communication volume for transmitting or retransmitting the key update message takes the minimum value, and the key delivery module transmits the key update message by using the minimum communication volume that corresponds to the specified multiplicity.

主权项

1. A sensor network comprising a large number of sensor terminals each storing an element key and a sensor management server connected mutually, in which the sensor management server transmits a key update message to each of the sensor terminals, and each of the sensor terminals updates the element key according to the received key update message and performs encrypted communication with the sensor management server by utilizing the element key, wherein
the sensor management server comprises a key delivery module which transmits the key update message with a multiplicity that is a lower limit value of number the update messages transmitted to each of the sensor terminals.