Abstract
The exchange of confidential messages is an inherent problem in wireless communication due to the broadcast nature of the radio channel. In this paper, we enhance standard cryptography with information-theoretic techniques by exploiting relays to increase the confidentiality of wireless communication in the presence of one or more eavesdroppers with low-noise receivers. To achieve this, we present a protocol which makes use of relays in two ways. First, the relays re-transmit disjoint encrypted chunks of a message. Second, the relays utilize cooperative jamming techniques to generate pseudo-random signals in order to increase the interference level in the propagation domain. Chunks and interference levels are allocated over relays in such a way that the message can only be decoded within a critical area around the intended receiver. Our simulation results show that this area can be minimized under realistic assumptions on propagation environment and channel knowledge.
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