Online services such as web search and e-commerce applications typically rely on the collection of data about users, including details of their activities on the web. Such personal data is used to maximize revenues via targeting of advertisements and longer engagements of users, and to enhance the quality of service via personalization of content. To date, service providers have largely followe...

On-Line Authenticated Encryption (OAE) combines privacy with data integrity and is on-line computable. Most block cipher-based schemes for Authenticated Encryption can be run on-line and are provably secure against nonce-respecting adversaries. But they fail badly for more general adversaries. This is not a theoretical observation only – in practice, the reuse of nonces is a frequent issue. In ...

The decentralized execution of business process instances is a promising approach for enabling flexible reactions to contextual changes at runtime. Most current approaches address such process distribution by physical fragmentation of processes and by dynamic assignment of resulting static process parts to different business partners. In order to enable a more dynamic segmentation of such respo...

We present an approach to differentially private computation in which one does not scale up the magnitude of noise for challenging queries, but rather scales down the contributions of challenging records. While scaling down all records uniformly is equivalent to scaling up the noise magnitude, we show that scaling records non-uniformly can result in substantially higher accuracy by bypassing th...

Privacy Preserving Data Publishing (PPDP) is a research field that deals with the development of methods to enable publishing of data while minimizing distortion, for maintaining usability on one hand, and respecting privacy on the other hand. Sequential release is a scenario of data publishing where multiple releases of the same underlying table are published over a period of time. A violation...

In this paper we present an application to a Distributed Agenda Management problem through a decentralised multi-agent coordination model. Each agent represents a user's personal agenda, which must to co-ordinate with other agendas in order to reach a joint commitment, such as a meeting scheduling, respecting user privacy and local constraints. Constraints represent personal preferences and com...

Considering the acceptance of culture as the principle predictorof understanding housing elements, including religious and behavioral patterns, is becoming increasingly important. This understanding can be clearly visualized in a city such as Kerman. Kerman is located in South-East of Iran andhas a diverse culture witha residential district in which Muslims, Zoroastrians, and Jews liveside b...

The rising rate of obesity world-wide is a significant problem for society and affected individuals. There is a large body of past and ongoing work into the use of technology to promote increased physical activity in an attempt to reverse this trend. We discuss our ongoing efforts to develop and evaluate low-complexity wearable ambient displays for personal and social activity monitoring. We co...

We propose six challenges in evaluating mobile learning: capturing and analysing learning in context and across contexts, measuring mobile learning processes and outcomes, respecting learner/participant privacy, assessing mobile technology utility and usability, considering the wider organisational and socio-cultural context of learning, and assessing in/formality. A three-level framework for e...