To secure today's computer systems, it is critical to have different intrusion detection sensors embedded in them. The complexity of distributed computer systems makes it difficult to determine the appropriate choice and placement of these detectors because there are many possib…
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The objective of this research is to devise algorithms for video-based face recognition based on spatio-temporal manifolds. The primary focus is to better represent nonlinear face patterns on a data manifold, while incorporating spatio-temporal information that is inherent in vi…
Over the years, the focus of information security has evolved from technical issue to business issue. Heightened competition from globalization compounded by emerging technologies such as cloud computing has given rise to new threats and vulnerabilities which are not only comple…
This thesis contributes to the study of the usability and security of visuo-cognitive authentication techniques, particularly those relying on recognition of abstract images, an area little researched. Many usability and security problems with linguistic passwords (including tra…
The traditional approach to a digital investigation when a computer system is encountered in a running state is to remove the power, image the machine using a write blocker and then analyse the acquired image. This has the advantage of preserving the contents of the computer’s h…
Electromagnetic (EM) threats are a specialised subset of offensive threats to the confidentiality, integrity, and availability of information and to information security (INFOSEC) in general. Two broad classifications of threat types; EM interceptors (interception of compromisin…
Running critical applications, such as e-commerce, in a distributed environment requires assurance of the identities of the participants communicating with each other. Providing such assurance in a distributed environment is a di The Distributed Temporal Protocol Logic (DTPL) pr…
Most research discussing malware detection completely dismisses signatures as being a thing of the past, accusing signatures of suffering from a weak ability to detect zero-day malware. This indeed could be the case if we are still referring to the classic definition of signatur…
The main focus of this thesis is on the design and analysis of undeniable signature schemes in certificate-free settings, namely, identity-based setting and certificateless setting. Undeniable signature is a special type of digital signatures which is not universally verifiable.…
Internet users rely on the availability of websites and digital services to engage in political discussions, report on newsworthy events in real-time, watch videos, etc. However, sometimes those who control networks, such as governments, censor certain websites, block specific a…
The transition process to ICT (Information and Communication Technology) has had significant influence on different aspects of society. Although the computerisation process has motivated the alignment of different technical and human factors with the expansion process, the techn…
After a physical crime occurs, an important action typically takes place: the reporting of the crime to the police. However, this action becomes more complex for a victim to properly execute when a cybercrime is experienced, which can be partly explained by a lack of knowledge a…