Physical separation between the network and user

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Physical separation between the network and user agents is indeed ex- isting practice in mobile telephone networks, where the network agent of a mobile A is the SIM card provided by the network operator. The user agent can choose any mobile phone operated, manufactured by any vendor. The SIM card, provided by the network operator, is what carries the secrets necessary for the user to take part in the network. Obviously different sets of secrets will be needed for the user and network agents of the same mobile device. More specifically, the secrets assigned to the user agent should be used only for securing application layer data exchanged between end-points. The user agent secrets can be privy to the owner of the mobile. Thus no hardware protection of such secrets are required. It is also desirable that the network operators do not have access to the user’s application layer secrets. After all, end-users rely on the network only for delivering the packets. The network agent secrets should be used for authenticating routing data. It is obviously desirable to ensure that the end-user does not have d Tamper-responsive computers respond to intrusions by zeroizing their secrets. 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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Key Distribution 51 access to the network agent secrets. Thus, computations using the net- work agent secrets should be performed only inside the SIM card. The network agent secrets can, however, be stored encrypted outside the SIM card (encrypted using a secret stored inside the SIM card). In such scenarios, it is desirable to reduce the computational overhead inside the tamper-responsive boundary. Obviously, limiting the network agent to only symmetric primitives has some compelling advantages. In such scenarios the SIM card can consist of an elementary processor with a hardware block-cipher or hash function, which could be re-used for all computations. Low computational overhead translates to low heat dissipa- tion, which in turn implies that strategies for shielding the SIM card from intrusions (aimed at exposing the network agent secrets) will be less con- strained. Furthermore, lowering the complexity of the computing engine in the SIM card will also permit easier verification of the integrity of the SIM card. This will permit realization of trustworthy SIM cards, at a low cost. 4.4. User Agent and Network Agent KDSs KSSC and MLS are ideally suited for the network agent as 1) storage for encrypted secrets for KSSC, or public values for MLS, is not an issue; and 2) KSSC and MLS impose very low computational burden inside the SIM card - a few tens of hashes for KSSC, and one hash for MLS.
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