| 摘要 |
A system for generating a common encryption key for secure communication between devices; the system including: a plurality of devices, each associated with at least one unique device identifier; the plurality of devices being arranged in subgroups Si(i=1 . . . n) of devices, with at least one of the subgroups including a plurality of devices; and a central device including an algorithm generator for generating a key generating algorithm KGA1 for each of the plurality of devices based on its associated unique device identifier; each of the key generating algorithms KGAi being unique for a respective associated subgroup Si with the key generating algorithms KGAi being the same for each device of the same subgroup Si; for each subgroup Si the associated key generating algorithm KGAi being operative to generate for devices of each subgroup Sj a common subgroup key SGKi,j for use in communication between a device of subgroup Si and a device of subgroup Sj; the common subgroup key SGKi,j being generated in response to receiving any one of the device identifiers associated with devices in the subgroup Sj; each device being associated with a respective storage for storing its associated key generating algorithm and including a processor for executing the associated key generating algorithm.
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