This paper introduces the concept of “revocable unlinkability” for unlinkable anonymous signatures and proposes a generalized scheme that modifies the signatures to include revocable unlinkability. Revocable unlinkability provides a condition in which multiple messages signed using an unlinkable anonymous signature are unlinkable for anyone except the unlinkability revocation manager. Noteworth...

A MIX net takes a list of ciphertexts (c1, · · · , cN ) and outputs a permuted list of the plaintexts (m1, · · · ,mN ) without revealing the relationship between (c1, · · · , cN ) and (m1, · · · ,mN ). This paper first shows that the Jakobsson’s MIX net of Eurocrypt’98, which was believed to be resilient and very efficient, is broken. We next propose an efficient t-resilient MIX net with O(t) s...

“MIX-net” systems protect the privacy of participants by clouding together their transactions through cascades of third parties. Reliability and trust are therefore open issues in this literature and limit the applicability of these systems. This paper discusses how the MIX approach can be adapted to put the user at the center of the protocol and in control of it, so that each participant can t...

Investment in research is indeed a "rational" investment. Thesis issues and projects in highereducation are the sources of research at educational institutions and have an evident role in helpingprofessionals and researchers. However, lack of fit scientific methods along with the ignorance ofthe proper processes of science has somewhat diminished the importance of research. This studypoints out...

Case-mix classification and payment systems help assure that persons with similar needs receive similar amounts of care resources, which is a major equity concern for consumers, providers, and programs. Although health service programs for adults regularly use case-mix payment systems, programs providing health services to children and youth rarely use such models. This research utilized Medica...

The adoption of EMR systems has been argued to lead to physicians “upcoding” their patients to inflate insurance reimbursements. In this paper, we examine if the adoption of the Clinical Physician Order Entry (CPOE) system is associated with an increase in the complexity of the patients' case mix that hospitals report (termed "upcoding"). We make use of a staggered roll-out of the Recovery Audi...

All implementations of verifiable mix-nets provide computational privacy only, because the audit information published is encrypted using some public key algorithm. Consequently, at some time in the future, when the underlying cryptographic assumption is broken, privacy is violated, and each output message can be traced back to its input. We address this problem by presenting a mix-net that use...

Background The position of the intrauterine device (IUD) in Kenya’s contraceptive method mix among married women of reproductive age has declined over time, dropping from a prevalence of 4.2% in 1993 to 2.4% in 2003 (CBS, MOH, & ORC Macro, 2004). Moreover, as contraceptive prevalence has increased (currently at 33% for modern methods), the IUD’s share of the modern method mix has declined by ha...

Marketing-mix plays an essential role in the competitive business environment. Marketing decision makers constantly need to monitor changes in the environment and organization to make necessary changes. Therefore, a knowledge management system is required to acquire, store, retrieve and use up-to-dated knowledge. Corporations also tend to look for systems assisting them in knowledge management....