During the initialization of a sensor network, each node must discover all of the half-key spaces shared with its neighboring nodes within its wireless communi cation range. The discovery of shared half-key spaces may be accomplished by the broadcasting of key-space identifiers among nodes. If the number of half-key spaces shared between two neighboring nodes is more than a user-defined
threshold q, then we say that these two nodes could establish a communication link; otherwise, there is no communication link between these two nodes. The rationale behind this setting is to avoid potential attacks, due to an insufficient number of session key candidates.
Security and Privacy in Internet of Things - Edited by Fei Hu
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