IST Austria Thesis

Many security definitions come in two flavors: a stronger “adaptive” flavor, where the adversary can arbitrarily make various choices during the course of the attack, and a weaker “selective” flavor where the adversary must commit to some or all of their choices a-priori. For example, in the context of identity-based encryption, selective security requires the adversary to decide on the identity of the attacked party at the very beginning of the game whereas adaptive security allows the attacker to first see the master public key and some secret keys before making this choice. Often, it appears to be much easier to achieve selective security than it is to achieve adaptive security. A series of several recent works shows how to cleverly achieve adaptive security in several such scenarios including generalized selective decryption [Pan07][FJP15], constrained PRFs [FKPR14], and Yao’s garbled circuits [JW16]. Although the above works expressed vague intuition that they share a common technique, the connection was never made precise. In this work we present a new framework (published at Crypto ’17 [JKK+17a]) that connects all of these works and allows us to present them in a unified and simplified fashion. Having the framework in place, we show how to achieve adaptive security for proxy re-encryption schemes (published at PKC ’19 [FKKP19]) and provide the first adaptive security proofs for continuous group key agreement protocols (published at S&P ’21 [KPW+21]). Questioning optimality of our framework, we then show that currently used proof techniques cannot lead to significantly better security guarantees for "graph-building" games (published at TCC ’21 [KKPW21a]). These games cover generalized selective decryption, as well as the security of prominent constructions for constrained PRFs, continuous group key agreement, and proxy re-encryption. Finally, we revisit the adaptive security of Yao’s garbled circuits and extend the analysis of Jafargholi and Wichs in two directions: While they prove adaptive security only for a modified construction with increased online complexity, we provide the first positive results for the original construction by Yao (published at TCC ’21 [KKP21a]). On the negative side, we prove that the results of Jafargholi and Wichs are essentially optimal by showing that no black-box reduction can provide a significantly better security bound (published at Crypto ’21 [KKPW21c])

Giant chirality-induced spin-selectivity of polarons

The chirality-induced spin selectivity (CISS) effect gives rise to strongly spin-dependent transport through many organic molecules and structures. Its discovery raises fascinating fundamental questions as well as the prospect of possible applications. The basic phenomenology, a strongly asymmetric magnetoresistance despite the absence of magnetism, is now understood to result from the combination of spin-orbit coupling and chiral geometry. However, experimental signatures of electronic helicity were observed at room temperature, i.e., at an energy scale that exceeds the typical spin-orbit coupling in organic systems by several orders of magnitude. This work shows that a new energy scale for CISS emerges for currents carried by polarons, i.e., in the presence of strong electron-phonon coupling. In particular, we found that polaron fluctuations play a crucial role in the two manifestations of CISS in transport measurements -- the spin-dependent transmission probability through the system and asymmetric magnetoresistance

Obstetric violence: a Latin American legal response to mistreatment during childbirth

Over the last several years, a new legal construct has emerged in Latin America that encompasses elements of quality of obstetric care and mistreatment of women during childbirth - both issues of global maternal health import. Termed "obstetric violence," this legal construct refers to disrespectful and abusive treatment that women may experience from health care providers during pregnancy, childbirth, and the postpartum period, as well as other elements of poor quality care, such as failure to adhere to evidence-based best practices. This new legal term emerged out of concerted efforts by women's groups and networks, feminists, professional organizations, international and regional bodies, and public health agents and researchers to improve the quality of care that women receive across the region.Fil: Williams, Caitlin R.. University of North Carolina; Estados UnidosFil: Jerez, Celeste. Universidad de Buenos Aires. Facultad de Filosofía y Letras. Instituto Interdisciplinario de Estudios de Género; ArgentinaFil: Klein, Karen. Instituto de Efectividad Clínica y Sanitaria; ArgentinaFil: Correa, Malena. Instituto de Efectividad Clínica y Sanitaria; ArgentinaFil: Belizan, Jose. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Instituto de Efectividad Clínica y Sanitaria; ArgentinaFil: Cormick, Gabriela. Instituto de Efectividad Clínica y Sanitaria; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. University of Cape Town; Sudáfric

Resilience and community response to climate-related events: Case studies from four countries

It is important for governments, aid organizations, and researchers to understand how developing communities respond to climate change and how their efforts can be improved within a framework of resilience thinking. This review explores the definition of resilience and, more specifically, community resilience and its components, then presents four case studies of community response to extreme weather events to illustrate community resilience in action. The review is intended to provide context for and inform more detailed exploration of community resilience in integrated programming (specifically, programming designed to improve health, environment, and population outcomes). It is also intended to capture references to population dynamics and family planning in the literature on community resilience, but is not intended as a definitive guide to the links between community resilience and health or family planning

Collaborative Learning in a Faculty-led Occupational Therapy Level I Fieldwork: A Case Study

Fieldwork experiences in occupational therapy are meant to bridge the gap between academic learning and clinical practice. Various formats for fieldwork experiences have been encouraged as sites become harder to find. A faculty-led fieldwork experience is one suggested format. Faculty-led initiatives using a collaborative learning model (CLM) allow faculty to supervise a group of students at one time. In order to understand more about using a CLM within Level I fieldwork, a case study approach was used to describe the experience of nine occupational therapy students. Results suggest that the students involved in this faculty-led Level I fieldwork experience in a CLM were self-directed and reflective in practice as they were stretched outside their comfort zone. Under a faculty-led collaborative student supervision model, the occupational therapy students increased their confidence and learned clinical reasoning skills through peer collaboration. These results suggest that CLM can provide adequate structure for faculty-led fieldwork initiatives. Occupational therapy programs should provide opportunities to develop goals and be reflective and self-directed in practice during faculty-led Level I fieldwork experiences. Other considerations for OT programs wishing to develop such experiences are discussed