Secrecy Throughput of MANETs Under Passive and Active Attacks

• Published in: IEEE transactions on information theory Vol. 57; no. 10; pp. 6692 - 6702
• Main Authors: Yingbin Liang, Poor, H. V., Lei Ying
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.10.2011; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Ad hoc networks; Applied sciences; Data transmission; Delay; Encoding; Equipments and installations; Erasure channel; Exact sciences and technology; Information theory; Information, signal and communications theory; Mathematical models; mobile ad hoc network (MANET); Mobile communications networks; Mobile computing; Mobile radiocommunication systems; mobility model; Network security; Radiocommunications; Receivers; secrecy; Secret; Security; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Throughput; throughput scaling; Transmission and modulation (techniques and equipments); wiretap channel; Mobile radiocommunication; Mobile ad hoc network; Wireless telecommunication; Information rate; Erasure channel; Information transmission; mobile ad hoc network (MANET); Eavesdropping; throughput scaling; mobility model; Delay time; wiretap channel; Secrecy; Telecommunication security; Information theory
• DOI: 10.1109/TIT.2011.2165800
• ISSN: 0018-9448

The secrecy throughput of mobile ad hoc networks (MANETs) with malicious nodes is investigated. The MANET consists of n legitimate mobile nodes and m malicious nodes. Transmissions between legitimate nodes are subject to a delay constraint D . A model under passive attack is first studied, in which the malicious nodes are assumed to be eavesdroppers that only listen to transmission without actively injecting signals. An information-theoretic approach for security is applied to achieve secure communication among legitimate nodes in MANETs with transmissions being kept perfectly secure from eavesdroppers. A critical threshold on the number of malicious nodes ( m ) is identified such that when m = o (√{ nD }), i.e., lim n→∞ m /√{ nD } = 0, the optimal secrecy throughput equals that of MANETs without malicious nodes, i.e., the impact of the presence of malicious nodes on the network throughput is negligible; and when m = Ω(√{ nD }poly( n )), i.e., lim n→∞ m /(√{ nD }poly( n )) ≥ c for a positive constant c, the optimal secrecy throughput is limited by the number of malicious nodes. A model under active attack is further studied, in which the malicious nodes actively attack the network by transmitting modified packets to the destination nodes. It is shown that to guarantee the same throughput as the model under passive attack, the model under active attack needs to satisfy more stringent condition on the number of malicious nodes.