Mathematical Analysis of Secrecy Amplification in Key Infection: The Whispering Mode


IEICE TRANSACTIONS on Information and Systems   Vol.E102-D   No.12   pp.2599-2602
Publication Date: 2019/12/01
Online ISSN: 1745-1361
DOI: 10.1587/transinf.2019EDL8055
Type of Manuscript: LETTER
Category: Information Network
sensor network,  smart dust,  key management,  key infection,  secrecy amplification,  

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A wireless sensor network consists of spatially distributed devices using sensors to monitor physical and environmental conditions. Key infection is a key distribution protocol for wireless sensor networks with a partially present adversary; a sensor node wishing to communicate secretly with other nodes simply sends a symmetric encryption key in the clear. The partially present adversary can eavesdrop on only a small fraction of the keys. Secrecy amplification is a post-deployment strategy to improve the security of key infection by combining multiple keys propagated along different paths. The previous mathematical analysis of secrecy amplification assumes that sensor nodes always transmit packets at the maximum strength. We provide a mathematical analysis of secrecy amplification where nodes adjust their transmission power adaptively (a.k.a. whispering mode).