DelaylDisruption tolerant networks (DTNs) are wireless networks where a complete path from source to destination is not in existence most of the time, and even when it does exist, it is highly unstable and unpredicted. This together with limited computing and storage capacity, heterogeneity and high error rate amongst others violate most of the internet assumptions. This necessitated the design of DTN architecture to relax some of the Internet assumptions and provide interoperabilijy across heterogeneous networks with different network characteristics. The identified security threats in these networks this work is designed to address are masquerading, modification, replay and unauthorized access/use of resources. This work proposes a novel access control scheme that is based on both secret-key and public-key cryptography. The scheme is designed to be independent of server availability and recipient network connectivity during post trust establishment communication. The main contributions in this thesis are: Propose and implement a lightweight asymmetric based Authorization Pass (APass) as an alternative to digital certificate; Design and implement a PKI-based trust management scheme that facilitates secure exchange of public keys without binding it to credential, access control implementation and flexible trust termination process; Propose and implement a trust based authentication scheme that employs Hash-based Message Authentication Code (HMAC) for message authentication and integrity, and APass for source authentication; Investigate and establish the applicability of the push messaging sequence of the generic AAA (Authentication, Authorization and Accounting) architecture with modification, and extend the proposed authentication scheme to implement policy; Propose and implement generic AAA architecture concepts based access control decision making process using DTN Bundle Node. The proposed solutions are extensively discussed with their efficiency and effectiveness as well as comparative advantage demonstrated through simulations.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:553704 |
| Date | January 2012 |
| Creators | Johnson, Enyenihi Henry |
| Publisher | University of Surrey |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
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