Thesis (DTech. degree in Computer Science and Data Processing: Software Development.)--Tshwane University of Technology, 2012. / Based on the fundamental assumption that individuals view their privacy differently, this study attempts to find a solution on how to protect the personal information of an individual stored in a relational database system against privacy violations. Secondly, to determine how the Hippocratic principles can be effectively applied to give individuals better control over their personal information, while at the same time allowing the organisation to process its transactions on the same personalised information. In answering these problems, the study established a set of extended principles to which the collection and the use of personal data should strictly hold.

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This thesis represents a tolerance near set approach to detect similarity between digital images. Two images are considered as sets of perceptual objects and a tolerance relation defines the nearness between objects. Two perceptual objects resemble each other if the difference between their descriptions is smaller than a tolerable level of error. Existing tolerance near set approaches to image similarity consider both images in a single tolerance space and compare the size of tolerance classes. This approach is shown to be sensitive to noise and distortions. In this thesis, a new tolerance-based method is proposed that considers each image in a separate tolerance space and defines the similarity based on differences between histograms of the size of tolerance classes. The main advantage of the proposed method is its lower sensitivity to distortions such as adding noise, darkening or brightening. This advantage has been shown here through a set of experiments.

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This thesis represents a tolerance near set approach to detect similarity between digital images. Two images are considered as sets of perceptual objects and a tolerance relation defines the nearness between objects. Two perceptual objects resemble each other if the difference between their descriptions is smaller than a tolerable level of error. Existing tolerance near set approaches to image similarity consider both images in a single tolerance space and compare the size of tolerance classes. This approach is shown to be sensitive to noise and distortions. In this thesis, a new tolerance-based method is proposed that considers each image in a separate tolerance space and defines the similarity based on differences between histograms of the size of tolerance classes. The main advantage of the proposed method is its lower sensitivity to distortions such as adding noise, darkening or brightening. This advantage has been shown here through a set of experiments.

Thesis (M. Phil.)--University of Hong Kong, 1999. / Includes bibliographical references (leaves 139-144).

The phrase 'Internet of Things' refers to the pervasive instrumentation of physical objects with sensors and actuators, and the connection of those sensors and actuators to the Internet. These sensors and actuators are generally based on similar hardware as, and have similar capabilities to, wireless sensor network nodes. However, they operate in a completely different network environment: wireless sensor network nodes all generally belong to a single entity, whereas Internet of Things endpoints can belong to different, even competing, ones. This difference has profound implications for the design of security mechanisms in these environments. Wireless sensor network security is generally focused on defence against attack by external parties. On the Internet of Things, such an insider/outsider distinction is impossible; every entity is both an endpoint for legitimate communications, and a possible source of attack. We argue that that under such conditions, the centralised models that underpin current networking standards and protocols for embedded systems are simply not appropriate, because they require such an insider/outsider distinction. This thesis serves as an exposition in the design of decentralised security mechanisms, applied both to applications, which must perform access control, and networks, which must guarantee communications security. It contains three main contributions. The first is a threat model for Internet of Things networks. The second is BottleCap, a capability-based access control module, and an exemplar of decentralised security architecture at the application layer. The third is StarfishNet, a network-layer protocol for Internet of Things wireless networks, and a similar exemplar of decentralised security architecture at the network layer. Both are evaluated with microbenchmarks on prototype implementations; StarfishNet's association protocol is additionally validated using formal verification in the protocol verification tool Tamarin.

Cloud computing is one of the most promising technologies for backup and data storage that provides flexible access to data. Cloud computing plays a vital role in remote backup. It is so unfortunate that this computing technique has flaws that thrilled and edgy end users in implementing it effectively. These flaws include factors like lack of integrity, confidentiality and privacy to information. A secure cloud is impossible unless the computer-generated environment is appropriately secured. In any form of technology it is always advisable that security challenges must be prior identified and fixed before the implementation of that particular technology. Primarily, this study will focus on finding security issues in cloud computing with the objective of finding concerns like credential theft and session management in the ―Cloud‖. Main arguments like HTTP banner disclosure, Bash ―ShellShock‖ Injection and password issues were discovered during the stages of study implementation. These challenges may provide information that will permit hackers in manipulating and exploiting cloud environment. Identifying credential theft and session management in cloud-based file sharing technologies a mixed method approach was implemented throughout the course of the study due to the nature of study and unity of analysis. Penetration tests were performed as security testing technique. Prevention and guideline of security threats leads to a friendly and authentic world of technology.

Thesis (Masters Diploma (Technology))--Cape Technikon, Cape Town, 1995 / The development of a 200 MeV clinical proton therapy facility at the National Accelerator Centre required an interlock and control system to supervise the delivery of radiation to a patient. The interlock and control system is responsible for ensunng that nobody enters the treatment vault during an irradiation, the extraction of the beamstop devices 'from the beam-line to allow the irradiation of the patient and the insertion of those beam-stop devices when an error condition is detected. Because of its nature, the interlock and control system should be designed so that in the event of an error condition being detected, it should fail to a safe state. This is achieved by modelling the interlock and control system with an appropriate modeling method. This thesis describes a graphical modelling method called Petri-nets, which was used to model the system, and the software developed from the model.

M.Tech. / Mobile handheld devices are moving from being peripheral devices and are now fulfilling functionality provided by laptops and desktops. The capability and functionality of handheld devices have improved. This makes the devices more prominent within public and private environments, allowing information to be processed inside and outside of the organisation’s network. Of all mobile handheld devices, the personal digital assistant (PDA) is seen to be more robust and powerful, increasing its use and popularity among users. PDAs offer wireless connectivity like Bluetooth and operate with multiple operating systems, also allowing them to be considered as a private or organisational enterprise tool. Bluetooth connectivity allows workers to access information anywhere, including both personal and corporate information. Software and applications have been specifically developed for handheld devices such as PDAs, giving users a high level of usability and functionality. The purpose of this dissertation is to present an information security evaluation of a Bluetooth-enabled handheld device, such as a PDA. The use of Bluetooth wireless technology and functionality provides added benefits, but also brings new information security threats to an organisation’s information assets. The research attempts to understand the implications of using a Bluetooth-enabled handheld device in both public and private environments. Five high-level layers are defined for this discussion. Information security risks are evaluated based on current research into vulnerabilities, attacks and tools that exist to compromise a Bluetooth-enabled handheld device. A Bluetooth penetration testing methodology is suggested for the identified vulnerabilities, attacks and tools, where a practical assessment is performed for a critical analysis of the information security mechanisms implemented by the Bluetooth-enabled handheld device (PDA). Possible recommendations to mitigate identified information security risks are also made. This study motivates the necessity of understanding the risks presented by a mobile workforce using Bluetooth connectivity in mobile handheld devices which can be used in both private and public environments.