521 redundancies in routing protocols mandating

Info icon This preview shows pages 68–70. Sign up to view the full content.

View Full Document Right Arrow Icon
5.2.1. Redundancies in Routing Protocols Mandating authentication reduces the degrees of freedom for attackers. For example, if authentication is not mandated, any node can send any packet claiming any fictitious identity. With authentication, S cannot send routing data impersonating some node X . Cryptographic authentication appended by S provides an assurance that the information does indeed originate from the claimed sender S (or more specifically, some entity with access to the secrets of S ), and that it has not e Du et al. have 23 propose such a strategy where the secret is conveyed to two-hop nodes using pairwise secrets established using public key schemes. Using MLS or KSSC for this purpose renders the overhead for this purpose substantially lower. Copyright © 2010. World Scientific Publishing Company. All rights reserved. May not be reproduced in any form without permission from the publisher, except fair uses permitted under U.S. or applicable copyright law. EBSCO Publishing : eBook Collection (EBSCOhost) - printed on 2/16/2016 3:46 AM via CGC-GROUP OF COLLEGES (GHARUAN) AN: 340572 ; Beyah, Raheem, Corbett, Cherita, McNair, Janise.; Security in Ad Hoc and Sensor Networks Account: ns224671
Image of page 68

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
56 M. Ramkumar been modified en route. However, the fact that the routing data from S has been authenticated does not imply that the information itself is accurate. In a scenario where the information sent by S is that “node D is five hops from S ” there is nothing to convince the receiver that this information is indeed true. A malicious S can send some routing data indicating “ D is 10 hops away” or some non-existent node “ Y is 3 hops away”. However, if the verifier (the receiver of the routing data from S ) can independently verify from sources other than S , that D , is indeed 5 hops away from S , then the verifier has more confidence in the routing information sent by S . Without such redundancies , there is nothing that prevents a node from sending deliberately misleading routing information. One common approach to include this desirable redundancy (with rea- sonable overhead) is by carrying over authentication. In such a scenario, the information sent by S may be of the form “node D is five hops from S , and the next node in the path to S is Q .” To support its claim, node S also provides a message sent by Q claiming that “ D is four hops from Q , and S is a neighbor of Q ,” duly authenticated by Q . Thus the authentication appended by Q is carried over such that two-hop neighbors of Q can verify the appended authentication. 5.2.2. Distance Vector Protocols For DV based approaches the routing data disseminated by a node to its neighbors consists of several rows, each row indicating the distance to some node in the subnet. Unlike LS approaches where the routing data (LS packet) originating from a node is carried without any modifications to all nodes in the network, the routing table advertised by a node (in DV) is only sent to its neighbors. As every node will be aware of its neighbors, and the
Image of page 69
Image of page 70
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern