Instant Messaging (IM) has grown tremendously over the last few years. Even though IM was originally developed as a social chat system, it has found a place in many companies, where it is being used as an essential business tool. However, many businesses rely on free IM and have not implemented a secure corporate IM solution. Most free IM clients were never intended for use in the workplace and, therefore, lack strong security features and administrative control. Consequently, free IM clients can provide attackers with an entry point for malicious code in an organization’s network that can ultimately lead to a company’s information assets being compromised. Therefore, even though free IM allows for better collaboration in the workplace, it comes at a cost, as the title of this dissertation suggests. This dissertation sets out to answer the question of how free IM can facilitate an attack on a company’s information assets. To answer the research question, the dissertation defines an IM attack model that models the ways in which an information system can be attacked when free IM is used within an organization. The IM attack model was created by categorising IM threats using the STRIDE threat classification scheme. The attacks that realize the categorised threats were then modelled using attack trees as the chosen attack modelling tool. Attack trees were chosen because of their ability to model the sequence of attacker actions during an attack. The author defined an enhanced graphical notation that was adopted for the attack trees used to create the IM attack model. The enhanced attack tree notation extends traditional attack trees to allow nodes in the trees to be of different classes and, therefore, allows attack trees to convey more information. During the process of defining the IM attack model, a number of experiments were conducted where IM vulnerabilities were exploited. Thereafter, a case study was constructed to document a simulated attack on an information system that involves the exploitation of IM vulnerabilities. The case study demonstrates how an attacker’s attack path relates to the IM attack model in a practical scenario. The IM attack model provides insight into how IM can facilitate an attack on a company’s information assets. The creation of the attack model for free IM lead to several realizations. The IM attack model revealed that even though the use of free IM clients may seem harmless, such IM clients can facilitate an attack on a company’s information assets. Furthermore, certain IM vulnerabilities may not pose a great risk by themselves, but when combined with the exploitation of other vulnerabilities, a much greater threat can be realized. These realizations hold true to what French playwright Jean Anouilh once said: “What you get free costs too much”.

Information plays a vast contributing role to all resources within an organisation. Organisations should recognise the importance of information and implement information security controls to protect their information as this will ensure that the organisation‟s information retains its confidentiality, integrity and availability. Information security controls, which are the means of managing information risks, rely heavily on the user‟s knowledge regarding the use of these controls for their effectiveness, and as such, users should be educated in order to maximise effectiveness of these controls. Current information security educational programmes are created without necessarily taking into account the target audience, who comprises of all employees, stakeholders, suppliers, third parties, customers or other external parties or third party that requires access to the organisation‟s information. This results in programmes that are not linguistically appropriate; or that present knowledge at an inappropriate level for the target audience. This could leave users bored or confused, without successfully changing their behaviour or improving knowledge. This dissertation identifies a baseline for information security knowledge targeted at end users. This was done by means of a Delphi Study, where a profile of “generic” end users comprised of information security topics and concepts were rated by experts from the field of information security education. This resulted in the elimination of inappropriate topics and concepts and retaining the relevant and appropriate aspects. This baseline for information security knowledge can be characterised as a minimum standard that everybody should be educated on as an introductory or refresher course. This can also serve as the foundation phase to educate end users with knowledge of the basic topics and concepts to enable them to fulfil their responsibilities in order to protect information. If needed, topics and concepts could be added to the baseline for information security knowledge for specialised target audiences (e.g. specialised End Users, ICT Staff or Top Management).

Information and the related assets form critical business assets for most organizations. Organizations depend on their information assets to survive and to remain competitive. However, the organization’s information assets are faced with a number of internal and external threats, aimed at compromising the confidentiality, integrity and/or availability (CIA) of information assets. These threats can be of physical, technical, or operational nature. For an organization to successfully conduct its business operations, information assets should always be protected from these threats. The process of protecting information and its related assets, ensuring the CIA thereof, is referred to as information security. To be effective, information security should be viewed as critical to the overall success of the organization, and therefore be included as one of the organization’s Corporate Governance sub-functions, referred to as Information Security Governance. Information Security Governance is the strategic system for directing and controlling the organization’s information security initiatives. Directing is the process whereby management issues directives, giving a strategic direction for information security within an organization. Controlling is the process of ensuring that management directives are being adhered to within an organization. To be effective, Information Security Governance directing and controlling depend on the organization’s Information Security Policy Architecture. An Information Security Policy Architecture is a hierarchical representation of the various information security policies and related documentation that an organization has used. When directing, management directives should be issued in the form of an Information Security Policy Architecture, and controlling should ensure adherence to the Information Security Policy Architecture. However, this study noted that in both literature and organizational practices, Information Security Policy Architectures are not comprehensively addressed and adequately managed. Therefore, this study argues towards a more comprehensive Information Security Policy Architecture, and the proper management thereof.

Organisations are increasingly dependent on their information. Compromise to this information in terms of loss, inaccuracy or competitors gaining unauthorised access could have devastating consequences for the organisation. Therefore, information security governance has become a major concern for all organisations, large and small. Information security governance is based on a set of policies and internal controls by which organisations direct and manage their information security. An effective information security governance programme should be based on a recognised framework, such as the Control Objectives for Information and related Technology (COBIT). COBIT focuses on what control objectives must be achieved in order to effectively manage the information technology environment. It has become very clear that if a company is serious about information security governance, it needs to apply the COBIT framework that deals with information security. The problem in some medium-sized organisations is that they do not realise the importance of information security governance and are either unaware of the risks or choose to ignore these risks as they do not have the expertise or resources available to provide them with assurance that they have the right information security controls in place to protect their organisation against threats.

A new access control model incorporating the notion of time and events is introduced. It allows the specification of fine-grained and flexible security policies which are sensitive to the operating environment. The system constraints, expressed in terms of access windows and obligations, are stored in extended access control lists. The addition of a capability mechanism gives another dimension of protection and added flexibility, so that the flexibility and expressive power of the system constraints is fully supported by the underlying mechanism. The approach is compared to several existing models and its' expressive power is demonstrated by showing the new model can be used to specify different existing security models as well as some special problems. The model is then adapted to work in a distributed environment. / Science, Faculty of / Computer Science, Department of / Graduate

Information Security is becoming a high-priority issue in most organizations. Management is responsible for the implementation of security in the organization. Information Security is a multi-dimensional discipline. A well-defined Information Security Management strategy will enable managers to manage security effectively and efficiently in the organization. Management must be able to assess the current security status of the organization. Currently, no comprehensive, integrated assessment tool or model exists to assess the total security posture of an organization. The study will address the problem by proposing a high-level integrated assessment model for Information Security. The study is divided into 4 parts. Part one: Introduction to Information Security Management consists of three chapters. Chapter 1 provides the user with an introduction and background to the study. In chapter 2, the study discusses Information Security as a multi-dimensional discipline. The dimensions identified are the Corporate Governance (Strategic and Operational), Policy, People, Risk Management, Legal, Compliance and Technology dimensions. Information Security is no longer a technical issue, it must be managed. The need for an Information Security Management strategy is discussed in chapter 3 of the study. A successful management strategy should be based on a well-defined Information Security Architecture. Part 2: Information Security Architectures, of the study consists of one chapter. Chapter 4 of the study discusses and compares different Information Security Architectures. The study uses the information gathered from the comparative study and best practices: CobiT and ISO17799, to propose a new Information Security Architecture: RISA. The study uses this architecture as a framework for the assessment model. Part 3: Assessing security consists of five chapters. Chapter 5 discusses the characteristics of assessment and proposes an assessment framework. The study recognizes that assessment on the different levels of an organization will be different, as the assessment requirements on management level will differ from the requirements on a technical level. It is important to use best practices in the assessment model as it enables organizations to prove their security readiness and status to business partners. Best practices and standards enable organizations to implement security in a structured way. Chapter 6 discusses the ISO17799 and CobiT as best practices and their role in the assessment process. Chapter 7 of the study discusses various factors that will influence security assessment in an organization. These factors are the size of the organization, the type of organization and the resources that need to be secured. The chapter briefly discusses the various dimensions of Information Security and identifies deliverables to assess for every dimension. The chapter proposes a high-level, integrated assessment plan for Information Security, using the deliverables identified for each dimension. The study refines the assessment plan for the Policy Dimension in chapter 8. The chapter proposes various checklists to determine the completeness of the policy set, correct format of every documented policy and if supporting documentation exist for every documented policy. A policy status result will be allocated to each policy that the organization needs. The status results of all the individual policies will be combined to determine the security status of the Policy dimension. The study proposes an integrated high-level assessment model in chapter 9 of the study. This model uses the RISA and assessment plan as proposed in chapter 7. It includes all the specified dimensions of Information Security. The assessment model will enable management to obtain a comprehensive high-level picture of the total security posture of an organization. Chapter 10 will summarize the research done and propose further research to be done. / Prof. S.H. von Solms

Information security has become a much discussed subject all over the world in the last few years. This is because information security is no longer a luxury, but a necessity in all organisations. The securing of information is not an easy task because information security is flexible and always seems to be in a state of development. This means that information security has undergone different development changes due to new technologies in the past few years. Information security became prominent around 50 years ago and had a very strict technical approach. In this approach, industries mainly worked with mainframes, with little or no concept of management aspects such as security policies or awareness programmes. The technical approach thus included little or no management effort in terms of information security. The need to manage information security began when new technologies such as the Internet and the World Wide Web were introduced to the information security environment. This caused information security to shift from the technical to the more managerial approach. The move of information security from the technical to the managerial approach may be identified through different development trends. These development trends have occurred mainly to improve information security management in any organisation. The primary purpose of this dissertation is therefore to identify and investigate different development trends that have an influence on information security, especially from a managerial point of view. / Prof. J.H.P. Eloff

Two recent shifts in computing are challenging the effectiveness of traditional approaches to data protection. Emerging machine learning workloads have complex access patterns and unique leakage characteristics that are not well supported by existing protection approaches. Second, mobile operating systems do not provide sufficient support for fine grained data protection tools forcing users to rely on individual applications to correctly manage and protect data. My thesis is that these emerging workloads have unique characteristics that we can leverage to build new, more effective data protection abstractions. This dissertation presents two new data protection systems for machine learning work-loads and a new system for fine grained data management and protection on mobile devices. First is Sage, a differentially private machine learning platform addressing the two primary challenges of differential privacy: running out of budget and the privacy utility tradeoff. The second system, Pyramid, is the first selective data system. Pyramid leverages count featurization to reduce the amount of data exposed while training classification models by two orders of magnitude. The final system, Pebbles, provides users with logical data objects as a new fine grained data management and protection primitive allowing data management at a higher level of abstraction. Pebbles, leverages high level storage abstractions in mobile operating systems to discover user recognizable application level data objects in unmodified mobile applications.

Criminal law aspects of data electronization in healthcare Abstract Continuous spread of information and communication technologies into all aspects of everyday life goes hand in hand with importance of data and information. This trend can be also observed in the healthcare sector which has recently experienced massive electronization. However, along with electronization, respective criminal law aspects are developing as well. Relevancy of this issue can be clearly demonstrated on the recent cyber-attacks on healthcare providers, which seriously jeopardize valuable data in healthcare. The aim of this work is to set forth comprehensive summary of criminal aspects of data electronization in healthcare with emphasis on the importance of electronization phenomenon, the issue of cybercrime and selected crimes that may be committed in connection with data electronization. This work also aims at highlighting negative impact of electronization in the global information society. In terms of content, the work consists of five structured chapters, in which the author defined relevant theory behind the issue and subsequently performed her own analysis thereof. The first chapter defines the term "data" as well as its categories and legislative framework with emphasis on area of criminal law and related protection of...

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