While the millimeter-wave (mmWave) communication is robust against the
conventional wiretapping attack due to its short transmission range and
directivity, this paper proposes a new opportunistic wiretapping and jamming
(OWJ) attack model in mmWave wireless networks. With OWJ, an eavesdropper can
opportunistically conduct wiretapping or jamming to initiate a more hazardous
attack based on the instantaneous costs of wiretapping and jamming. We also
provide three realizations of the OWJ attack, which are mainly determined by
the cost models relevant to distance, path loss and received power,
respectively. To understand the impact of the new attack on mmWave network
security, we first develop novel approximation techniques to characterize the
irregular distributions of wiretappers, jammers and interferers under three OWJ
realizations. With the help of the results of node distributions, we then
derive analytical expressions for the secrecy transmission capacity to depict
the network security performance under OWJ. Finally, we provide extensive
numerical results to illustrate the effect of OWJ and to demonstrate that the
new attack can more significantly degrade the network security performance than
the pure wiretapping or jamming attack