The padding scheme for RSA signatures

The RSA scheme is used to sign messages; however, in order to avoid forgeries, a message can be padded with a fixed string of data P. De Jonge and Chaum showed in 1985 that forgeries can be constructed if the size of P (measured in bytes) is less than the size of N/3, where N is the RSA modulus. Girault and Misarsky then showed in 1997 that forgeries can be constructed if the size of P is less than the size of N/2. In 2001, Brier, Clavier, Coron and Naccache showed that forgeries can still be constructed when the size of P is less than two thirds the size of N. In this paper, we demonstrate that this padding scheme is always insecure; however, the complexity of actually finding a forgery is O(N). We then focus specifically on the next unsettled case, where P is less than 3/4 the size of N and show that finding a forgery is equivalent to solving a set of diophantine equations. While we are not able to solve these equations, this work may lead to a break-through by means of algebraic number theory techniques.

Predicted packet padding for anonymous web browsing against traffic analysis attacks

Anonymous communication has become a hot research topic in order to meet the increasing demand for web privacy protection. However, there are few such systems which can provide high level anonymity for web browsing. The reason is the current dominant dummy packet padding method for anonymization against traffic analysis attacks. This method inherits huge delay and bandwidth waste, which inhibits its use for web browsing. In this paper, we propose a predicted packet padding strategy to replace the dummy packet padding method for anonymous web browsing systems. The proposed strategy mitigates delay and bandwidth waste significantly on average. We formulated the traffic analysis attack and defense problem, and defined a metric, cost coefficient of anonymization (CCA), to measure the performance of anonymization. We thoroughly analyzed the problem with the characteristics of web browsing and concluded that the proposed strategy is better than the current dummy packet padding strategy in theory. We have conducted extensive experiments on two real world data sets, and the results confirmed the advantage of the proposed method.

Anonymous web browsing through predicted pages

Anonymous web browsing is an emerging hot topic with many potential applications for privacy and security. However, research on low latency anonymous communication, such as web browsing, is quite limited; one reason is the intolerable delay caused by the current dominant dummy packet padding strategy, as a result, it is hard to satisfy perfect anonymity and limited delay at the same time for web browsing. In this paper, we extend our previous proposal on using prefetched web pages as cover traffic to obtain perfect anonymity for anonymous web browsing, we further explore different aspects in this direction. Based on Shannon’s perfect secrecy theory, we formally established a mathematical model for the problem, and defined a metric to measure the cost of achieving perfect anonymity. The experiments on a real world data set demonstrated that the proposed strategy can reduce delay more than ten times compared to the dummy packet padding methods, which confirmed the vast potentials of the proposed strategy.

Efficient web browsing with perfect anonymity using page prefetching

Anonymous web browsing is a hot topic with many potential applications for privacy reasons. The current dominant strategy to achieve anonymity is packet padding with dummy packets as cover traffic. However, this method introduces extra bandwidth cost and extra delay. Therefore, it is not practical for anonymous web browsing applications. In order to solve this problem, we propose to use the predicted web pages that users are going to access as the cover traffic rather than dummy packets. Moreover, we defined anonymity level as a metric to measure anonymity degrees, and established a mathematical model for anonymity systems, and transformed the anonymous communication problem into an optimization problem. As a result, users can find tradeoffs among anonymity level and cost. With the proposed model, we can describe and compare our proposal and the previous schemas in a theoretical style. The preliminary experiments on the real data set showed the huge potential of the proposed strategy in terms of resource saving.

A 'respectful relationships' approach : could it be the answer to preventing gender-based violence?

Effect of atmospheric plasma treatment on pad-dyeing of natural dyes on wool

Plasma treatment is an emerging surface modification technique that alters dye uptake of wool without using chemicals or water for pre-treatment. Padding is an established continuous dyeing technique known for its efficient use of water, time and energy. This study combined these two techniques for colouration of wool fabric using two natural dyes derived from the Acacia plant family. The investigation focused on the effects of plasma treatment and obtaining unique patterning effects. Helium (100%) and a mixture of helium and nitrogen (95%/5%) were used as the plasma gases under atmospheric conditions. Plasma treated wool fabric was padded with the above natural dyes. Copper sulphate and ferrous sulphate were applied on the dyed fabric as mordant yielding neutral shades of beige and grey respectively. Up to a 30% enhancement of dye adsorption on plasma treated wool substrate was observed as compared to untreated sample for both gases used. This higher adsorption indicates the hydrophilic character of the natural dyes used. Key performance parameters such as fastness to washing, rubbing and light were tested and found to be satisfactory. A single process tone-on-tone pattern was achieved by controlling the plasma exposure of treated area. This study concluded that a merger of natural dyes with modern plasma treatment and padding techniques for wool colouration was feasible.

Ebia Olewale : a life of service

Over the last seven decades, Papua New Guinea (PNG) has grown from a disparate collection of traditional societies loosely governed by its neighbour, Australia, to a thriving, developing state. The story of how PNG came to lose its colonial shackles and gain independence is one of collective endeavour, as the tiny group of Papua New Guineans who gathered in the dusty streets of Port Moresby transformed into the leaders of the new nation. One of them was the young teacher, Ebia Olewale, who in his own journey from the village to the nation experienced many triumphs and tragedies. PNG’s story – from the village to the world – is retold in this book, through the experiences of Ebia Olewale.

We need one district government to be set up to replace other district governments : the beginnings of Provincial Government in Papua New Guinea

Decentralisation, provincial government, and regional autonomy continue as influential factors in Papua New Guinea’s political economy.  The role played in creating PNG’s provincial government system by separatist movements in East New Britain, Bougainville and elsewhere is acknowledged.  However, as the Constitutional Planning Committee (CPC) discovered during its program of consultations with the Papua New Guinean people from 1972 to 1974, there was a strong groundswell around the country for district-level governments.  This article investigates how the CPC stimulated discussion of this issue through its own activities, and how the people in their discussion groups responded to the CPC’s ‘Discussion Paper on Relations Between the Central Government and Other Levels of Government’.

Gamblers' habit

The theories used to understand and predict regular non-problem gambling are almost exclusively affective or cognitive-oriented. These include motives, self-esteem, image enhancement and illusions of control over random events. However, gambling is one of the most frequently purchased consumer products, and the frequency of past behavior has traditionally been viewed as “habit” by psychologists and marketers. While habit as the frequency of past behavior has been shown to be a strong predictor of future behavior in gambling, habit offers little additional insight into gambling behavior in that form.

The frequency of past purchasing behavior is an important input to NBD-Dirichlet models that provide an enhanced ability to understand and predict future purchases of frequently purchased consumer package goods. NBD-Dirichlet models have been shown to provide an excellent fit to data for a broad range of frequently purchased goods and services for countries across the world. Applications of the NBD-Dirichlet models to data concerning gambling behavior show that these models consistently provide an even closer fit to the data than with other consumer models tested.

The interpretation of NBD-Dirichlet output can provide more accurate benchmarks than cognitive or affective output to test changes to the gambling environment (e.g., more games, new games, warnings) and to gamblers (e.g., problem gambling). The implications and use of the NBD-Dirichlet statistics for gambling providers and public policy is discussed.

Bunker-de-bunk 2012

Immersive interfaces for art education teaching and learning in virtual and real world learning environments

The musical and social benefits of community choir membership in Melbourne (Australia)

Finding a place for personal growth in an Australian community singing group for older people

As in many countries, Australia is faced with an aging population. This creates challenges for the maintenance of well-being which can be enhanced by active engagement in society. Music engagement encompasses a range of social participation and has the potential to recognise the contribution of older people to their local communities. Engagement in music by older people (50+) is positively related to individual and community well-being.  Music participation can contribute to a better quality of life, particularly in relation to health and happiness. The possible forms of music engagement are myriad.

This paper focuses on two members of a mixed voluntary singing group formed by older residents of an outer suburban community in Melbourne, Australia.  This study frames music as a positive way for older people to find a place for personal growth and fulfilment in a singing group. This phenomenological qualitative single case study focuses on two members of a small singing ensemble, the Skylarkers, formed to perform at retirement villages, nursing homes and facilities for senior citizens. In this study, data were gathered by interviews and analysed using interpretative phenomenological analysis.

Two significant themes emerged. The first concerned the nature of the choir and its fluid membership and notions of self-identity. The second theme concerns the validation offered to individual members by active music participation through which they gained a sense of purpose, fulfilment and personal growth. This emphasis is unusual in discussions of community music engagement that ordinarily identify the importance of social connections. Groups such as the Skylarkers provide a place for members to continue their active engagement with music performance and music learning.

Alzheimer's disease, media representations and the politics of euthanasia: constructing risk and selling death in an ageing society

Drawing on extensive data including news media reports and commentaries, documentaries, courts and court reports, films, websites, professional literature and government and non-government agencies, this book explores the 'Alzheimerisation' of the euthanasia debate, examining the shift in recent years in public attitudes towards the desirability and moral permissibility of euthanasia as an end-of-life 'solution' for people living with the disease - not just at its end stage, but also at earlier stages. With attention to mediarepresentations and public understandings of Alzheimer's disease, Alzheimer's Disease, Media Representations and the Politics of Euthanasia sheds light on the processes contributing to these changes in public opinion, investigating the drivers of vexed political debate surrounding the issue and examining the manner in which both sides of the euthanasia debate mobilise support, portray their opponents and make use of media technologies to frame the terms of discourse. Paving the way for a greater level of intellectual honesty with regard to an issue carrying significant policy implications, this book will be of interest to scholars of media and communication, social movements and political communication, and the sociology of health and medicine, as well as researchers and professionals in the fields of palliative and end of life care.

Crafts and successful aging: the Découpage Guild Australia