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This paper considers an OFDM wiretap channel with a legitimate transmitter (Alice), multiple legitimate receivers (Bobs), and an eavesdropper (Eve). Alice simultaneously transmits confidential message to each individual Bob. The timedomain Artificial noise (AN) is firstly employed to the wiretap OFDM channel with multiple Bobs. Under the proposed AN approach, a nonconvex sum secrecy rate maximization...
The security of the three-phase two-way relaying system with an eavesdropper is investigated in this paper. A cooperative jamming and power allocation scheme is proposed to enhance the system secrecy capacity. When a source node transmits user signals to the relay node, the other source node interferes the relay node with pre-defined jamming signals simultaneously. Optimum power allocation between...
With the development of Wireless sensor networks, secure communication among sensors by establishing pair-wise keys becomes a critical issue for many sensor network applications. Due to sensors' special uses, limited capabilities and declining connection probability, the random key pre-distribution schemes are no longer suitable for networks with large size. Multi-path key establishment scheme becomes...
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