Zambian copper mines have embraced the use of information technologies for strategic operations and competitive advantage. This dependence on these technologies has not only been seen in the physical aspects of business operations but also in the use of information systems such as Enterprise Resource Planning Systems (ERPs) for strategic decision making and increased usage of Industrial Control Systems (ICS’) that are meant to enhance operational efficiency in production areas. A survey was conducted to explore leadership perceptions on information security practices in Zambian copper mines and an ISO/IEC 27002 Audit Tool was administered to middle management in a particular mine for an in-depth analysis of their information security practices. Results revealed that although information security controls may have been put in place in these organisations, there are still areas that require attention. Senior management and middle management have different perceptions as to the extent to which information security practices are conducted in these copper mines. This implies that management may not be fully involved in certain aspects of these organisations’ information security practices. The results concluded that management needs to be fully involved and provide support for information security programs. Furthermore, these information security programs should be standardised so as to effectively protect these organisations’ information assets. This should also include the involvement of personnel as key players in the information security process.

Enterprise networks present very high value targets in the eyes of malicious actors who seek to exfiltrate sensitive proprietary data, disrupt the operations of a particular organization, or leverage considerable computational and network resources to further their own illicit goals. For this reason, enterprise networks typically attract the most determined of attackers. These attackers are prone to using the most novel and difficult-to-detect approaches so that they may have a high probability of success and continue operating undetected. Many existing network security approaches that fall under the category of intrusion detection systems (IDS) and intrusion prevention systems (IPS) are able to detect classes of attacks that are well-known. While these approaches are effective for filtering out routine attacks in automated fashion, they are ill-suited for detecting the types of novel tactics and zero-day exploits that are increasingly used against the enterprise. In this thesis, a solution is presented that augments existing security measures to provide enhanced coverage of novel attacks in conjunction with what is already provided by traditional IDS and IPS. The approach enables honeypots, a class of tech- nique that observes novel attacks by luring an attacker to perform malicious activity on a system having no production value, to be deployed in a turn-key fashion and at large scale on enterprise networks. In spite of the honeypot’s efficacy against tar- geted attacks, organizations can seldom afford to devote capital and IT manpower to integrating them into their security posture. Furthermore, misconfigured honeypots can actually weaken an organization’s security posture by giving the attacker a stag- ing ground on which to perform further attacks. A turn-key approach is needed for organizations to use honeypots to trap, observe, and mitigate novel targeted attacks.

published_or_final_version / Electrical and Electronic Engineering / Doctoral / Doctor of Philosophy

published_or_final_version / abstract / Electrical and Electronic Engineering / Doctoral / Doctor of Philosophy

published_or_final_version / Computer Science / Doctoral / Doctor of Philosophy

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M.Com. / Information and the IT systems that support it are important business assets. Their availability, integrity and confidentiality are essential to maintain an organisations competitive edge, cash flow, profitability, company image and compliance with legal requirements. Organisations world-wide are now facing increased security threats from a wide range of sources. Information systems may be the target of a range of serious threats including computer-based fraud, espionage, sabotage, vandalism and other sources of failure or disaster ...

M.Com. / The auditor has the objective to express an opinion on the financial statements on which he is reporting. It is important for the auditor to know that the data which he is auditing has not been changed without the necessary authority or been lost and that the data meets the three Information Security Objectives (IS0s) ...

M.Com. (Informatics) / Cyber issues are global phenomena in a world of inter-related systems, and as such, the discussion on cybersecurity frameworks, policies and strategies inevitably requires reference to, and benchmarking with regional, continental and global trends and solutions. This, in the context of the effects of globalisation on developing countries, with specific reference to areas such as Africa as a developing continent with regard to the protection of its cyberspace. More drastic measures, such as the utilization of cyber warfare techniques and pre-emptive cyber strike-teams in addition to traditional cybersecurity mechanisms as an essential part of a national security effort to protect cyberspace has become more prevalent within the developed worlds. Likewise, developing nations need to gear themselves in a structured, coordinated and responsible way in order to do their part to secure their own environments. Cyberspace is a dynamic global environment with cyber related issues being a global concern. Although countries generally regulate their own cyber environment through policy; cross-border cyber issues are difficult to resolve and the lack of international cyber laws impede cybersecurity efforts. Cybercrime and the management of cross-border cyber incidents are becoming a growing national security concern as the lack of effective controls leave critical infrastructure and the cyber-connected environment vulnerable to attack. Some developing countries are on track with the maturity of their cybersecurity initiatives, but appropriate cybersecurity frameworks for many developing countries require careful consideration, especially due to the lack of resources, infrastructure and local technology development capabilities.

The convenience of IEEE 802.11-based wireless access networks has led to widespread deployment. However, these applications are predicated on the assumption of availability and confidentiality. Error-prone wireless networks afford an attacker considerable flexibility to exploit the vulnerabilities of 802.11-based mechanism. Two of most famous misbehaviors are selfish and malicious attacks. In this thesis we investigate two attacks: Spurious CTS attack (SCTS) and Jamming ACK attack (JACK). In the SCTS, malicious nodes may send periodic Spurious CTS packets to force other nodes to update their NAV values and prevent them from using the channel. In the JACK, an attacker ruins legitimate ACK packets for the intention of disrupting the traffic flow and draining the battery energy of victim nodes quickly. Correspondingly, we propose solutions: termed Carrier Sensing based Discarding (CSD), and Extended Network Allocation Vector (ENAV) scheme. We further demonstrate the performance of our proposed schemes through analysis and NS2 simulations.