For many practical networks the total number of

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For many practical networks the total number of subscribers may be limited. For example, for networks within the scope of a large organization, the total number of subscribers may rarely exceed a few million. Almost any conceivable network-enabled mobile device can afford several GBs of pluggable flash storage. Given that storage for a million 64-bit secrets is a mere 8 MB, for many networks the need for O ( N ) storage may not be the limiting factor. Unfortunately, even in scenarios where O ( N ) storage requirement is not a limiting factor, scalable key distribution schemes are preferable, as the term “scalability” refers to much more than simply the “number of subscribers” that a network can support. Scalable key distribution schemes typically permit seamless induction of new subscribers into the network. For example, with the basic KPS, if a new node is added to the network, the KDC has to provide all existing nodes with a secret to authenticate the new node. While providing the new node with secrets to authenticate all existing nodes is not an issue, it is certainly not convenient to provide all existing nodes with a secret corresponding to the new node. Furthermore, scalable schemes include mechanisms for binding a unique subscriber identifier with the credentials of the user. For certificates based schemes this is achieved by signing certificates that bind the public key with different credentials. For ID based schemes this is achieved by choosing the ID as a one-way function of credentials, or simply by using some special bits in the ID to succinctly represent some credentials associated with the device/user. Note that for scalable ID based KPSs where the secrets as- signed to any entity is tied to the ID, an entity with ID A can compute K AB irrespective of when the entity B was inducted to the network. For basic KPS we cannot tie secrets to IDs as the credentials of entities who may be inducted in the future (and thus their IDs) is not known when existing entities are provided with secrets. The modified Leighton-Micali scheme (MLS) proposed recently 13 over- comes many of the deficiencies of the basic KPS. Like basic KPS 1) the MLS scheme is not susceptible to collusions; and 2) the total achievable 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
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46 M. Ramkumar network size N is limited by storage overhead that can be borne by the devices. However MLS permits seamless induction of new subscribers and ID based allocation of secrets.
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