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Fingerprinting Codes and Separating Hash Families
Get PDFThe thesis examines two related combinatorial objects, namely fingerprinting codes and separating hash families. Fingerprinting codes are combinatorial objects that have been studied for more than 15 years due to their applications in digital data copyright protection and their combinatorial interest. Four well-known types of fingerprinting codes are studied in this thesis; traceability, identifiable parent property, secure frameproof and frameproof. Each type of code is named after the security properties it guarantees. However, the power of these four types of fingerprinting codes is limited by a certain condition. The first known attempt to go beyond that came out in the concept of two-level traceability codes, introduced by Anthapadmanabhan and Barg (2009). This thesis extends their work to the other three types of fingerprinting codes, so in this thesis four types of two-level fingerprinting codes are defined. In addition, the relationships between the different types of codes are studied. We propose some first explicit non-trivial con- structions for two-level fingerprinting codes and provide some bounds on the size of these codes. Separating hash families were introduced by Stinson, van Trung, and Wei as a tool for creating an explicit construction for frameproof codes in 1998. In this thesis, we state a new definition of separating hash families, and mainly focus on improving previously known bounds for separating hash families in some special cases that related to fingerprinting codes. We improve upper bounds on the size of frameproof and secure frameproof codes under the language of separating hash families
A Betrayed Promise? The Politics of the Everyday State and the Resettling of Refugees in Pakistani Punjab, 1947-1962
No full textLahore, Anarkali, mid-1950s. A distinguished-looking refugee is standing in front of a petition writer in the hope of getting the better of the Pakistani bureaucracy and having a property allotted. A few miles ahead, another refugee, camped in a school, is drafting a letter to the editor of the Pakistan Times. He will hide his identity through the pseudonym ‘desperate’. Both of them belonged to the throng of those muhajirs who, back in 1947, had embarked on a dreadful journey towards what they perceived to be their homeland. Historiographical trends have tended to overlook the everyday experience of the state among those middle-class Partition refugees who resettled in Pakistani Punjab. Focusing mainly on their ‘less fortunate’ fellow citizens, these explanations have reproduced that historically-unproven popular narrative that ascribes pain and sufferings only to the economically-backward sectors of the local society. Even more frequently, well-rooted argumentative patterns have superimposed historical and present-day socio-geographical mappings of refugee families onto both urban and rural Punjab. These somehow echo that government rhetoric that, up to the early 1960s, paid lip service to the notion of a ‘biraderi-friendly’ rehabilitation. This thesis challenges standard interpretations of the resettlement of Partition refugees in Pakistani Punjab between 1947 and 1962. It argues the universality of the so-called ‘exercise in human misery’, and the heterogeneity of the rehabilitation policies. As it sheds light on these latter original contributions to the current knowledge, it questions the ability of the local bureaucracy to establish its own ‘polity’, the unsuitability of patronage political systems as an autonomous politological category, and the failure of Pakistan as a state. Individual chapters pursue questions of emotional belonging to spatial and political places, social change, everyday experiences of the state through its institutions, electoral politics, and the deployment of integration/accommodation practices as nation- and state-building processes
Deficits in volitional oculomotor control align with language status in autism spectrum disorders
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Accounting and the absence of a business economics tradition in the United Kingdom
No full textThe chapter explains why business economics did not emerge as a distinct discipline in the UK, and examines the extent to which accounting filled the gap left by this in UK universities
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