1,459 research outputs found
The Private Key Capacity of a Cooperative Pairwise-Independent Network
This paper studies the private key generation of a cooperative
pairwise-independent network (PIN) with M+2 terminals (Alice, Bob and M
relays), M >= 2. In this PIN, the correlated sources observed by every pair of
terminals are independent of those sources observed by any other pair of
terminal. All the terminals can communicate with each other over a public
channel which is also observed by Eve noiselessly. The objective is to generate
a private key between Alice and Bob under the help of the M relays; such a
private key needs to be protected not only from Eve but also from individual
relays simultaneously. The private key capacity of this PIN model is
established, whose lower bound is obtained by proposing a novel random binning
(RB) based key generation algorithm, and the upper bound is obtained based on
the construction of M enhanced source models. The two bounds are shown to be
exactly the same. Then, we consider a cooperative wireless network and use the
estimates of fading channels to generate private keys. It has been shown that
the proposed RB-based algorithm can achieve a multiplexing gain M-1, an
improvement in comparison with the existing XOR- based algorithm whose
achievable multiplexing gain is about [M]/2.Comment: 5 pages, 3 figures, IEEE ISIT 2015 (to appear
Principles of Physical Layer Security in Multiuser Wireless Networks: A Survey
This paper provides a comprehensive review of the domain of physical layer
security in multiuser wireless networks. The essential premise of
physical-layer security is to enable the exchange of confidential messages over
a wireless medium in the presence of unauthorized eavesdroppers without relying
on higher-layer encryption. This can be achieved primarily in two ways: without
the need for a secret key by intelligently designing transmit coding
strategies, or by exploiting the wireless communication medium to develop
secret keys over public channels. The survey begins with an overview of the
foundations dating back to the pioneering work of Shannon and Wyner on
information-theoretic security. We then describe the evolution of secure
transmission strategies from point-to-point channels to multiple-antenna
systems, followed by generalizations to multiuser broadcast, multiple-access,
interference, and relay networks. Secret-key generation and establishment
protocols based on physical layer mechanisms are subsequently covered.
Approaches for secrecy based on channel coding design are then examined, along
with a description of inter-disciplinary approaches based on game theory and
stochastic geometry. The associated problem of physical-layer message
authentication is also introduced briefly. The survey concludes with
observations on potential research directions in this area.Comment: 23 pages, 10 figures, 303 refs. arXiv admin note: text overlap with
arXiv:1303.1609 by other authors. IEEE Communications Surveys and Tutorials,
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