Security for Multihop Wireless Networks

288  ◾  Security for Multihop Wireless Networks

and comparing them with predefined fixed threshold. e main flaw of the scheme

is that it only considers univariate data. Furthermore, recollecting histograms incurs

network communication overhead that is not suitable for low-resource SNs.

Alternatively in nonparametric techniques, statistical anomaly-detection kernel

function-based approaches are used. Typically, a kernel is a weighting function that

is used for estimation techniques in nonparametric statistics [37]. Over the years,

several kernel function-based anomaly-detection schemes were proposed for WSNs.

Palpanas et al. [34] suggested a kernel function-based scheme to identify anoma-

lies in sensor data. e suggested scheme requires no prio ...