  Two-hop wireless network serves as the basic net-work model for the study of
general wireless networks, while cooperative jamming is a promising scheme to
achieve the physi-cal layer security. This paper establishes a theoretical
framework for the study of eavesdropper-tolerance capability (i.e., the exact
maximum number of eavesdroppers that can be tolerated) in a two-hop wireless
network, where the cooperative jamming is adopted to ensure security defined by
secrecy outage probability (SOP) and opportunistic relaying is adopted to
guarantee relia-bility defined by transmission outage probability (TOP). For
the concerned network, closed form modeling for both SOP and TOP is first
conducted based on the Central Limit Theorem. With the help of SOP and TOP
models and also the Stochastic Ordering Theory, the model for
eavesdropper-tolerance capability analysis is then developed. Finally,
extensive simulation and numerical results are provided to illustrate the
efficiency of our theoretical framework as well as the eavesdropper-tolerance
capability of the concerned network from adopting cooperative jamming and
opportunistic relaying.
