Language-based Techniques for Practical and Trustworthy Secure Multi-party Computations

Secure Multi-party Computation (MPC) enables a set of parties to collaboratively compute, using cryptographic protocols, a function over their private data in a way that the participants do not see each other's data, they only see the final output. Typical MPC examples include statistical computations over joint private data, private set intersection, and auctions. While these applications are examples of monolithic MPC, richer MPC applications move between "normal" (i.e., per-party local) and "secure" (i.e., joint, multi-party secure) modes repeatedly, resulting overall in mixed-mode computations. For example, we might use MPC to implement the role of the dealer in a game of mental poker -- the game will be divided into rounds of local decision-making (e.g. bidding) and joint interaction (e.g. dealing). Mixed-mode computations are also used to improve performance over monolithic secure computations. Starting with the Fairplay project, several MPC frameworks have been proposed in the last decade to help programmers write MPC applications in a high-level language, while the toolchain manages the low-level details. However, these frameworks are either not expressive enough to allow writing mixed-mode applications or lack formal specification, and reasoning capabilities, thereby diminishing the parties' trust in such tools, and the programs written using them. Furthermore, none of the frameworks provides a verified toolchain to run the MPC programs, leaving the potential of security holes that can compromise the privacy of parties' data. This dissertation presents language-based techniques to make MPC more practical and trustworthy. First, it presents the design and implementation of a new MPC Domain Specific Language, called Wysteria, for writing rich mixed-mode MPC applications. Wysteria provides several benefits over previous languages, including a conceptual single thread of control, generic support for more than two parties, high-level abstractions for secret shares, and a fully formalized type system and operational semantics. Using Wysteria, we have implemented several MPC applications, including, for the first time, a card dealing application. The dissertation next presents Wys*, an embedding of Wysteria in F*, a full-featured verification oriented programming language. Wys* improves on Wysteria along three lines: (a) It enables programmers to formally verify the correctness and security properties of their programs. As far as we know, Wys* is the first language to provide verification capabilities for MPC programs. (b) It provides a partially verified toolchain to run MPC programs, and finally (c) It enables the MPC programs to use, with no extra effort, standard language constructs from the host language F*, thereby making it more usable and scalable. Finally, the dissertation develops static analyses that help optimize monolithic MPC programs into mixed-mode MPC programs, while providing similar privacy guarantees as the monolithic versions.

A literary approach to teaching english language in a multicultural classroom

Literature is not generally considered as a coherent branch of the curriculum in relation to language development in either native or foreign language teaching. As teachers of English in multicultural Indian classrooms, we come across students with varying degrees of competence in English language learning. Although language learning is a natural process for natives, students of other languages put in colossal efforts to learn it. Despite their sincere efforts, they face challenges regarding pronunciation, spelling, and vocabulary. Indian classrooms are a microcosm of the larger society, so teaching English language in a manner that equips the students to face the cutthroat competition has become a necessity and a challenge for English language teachers. English today has become the key determinant for being successful in their careers. The hackneyed and stereotypical methods of teaching are not acceptable now. Teachers are no longer arbitrary dispensers of knowledge, but they are playing the role of a guide and facilitator for the students. Teachers of English are using innovative ideas to make English language teaching and learning interesting and simple. Teachers have started using literary texts and their analyses to explore and ignite the imagination and creative skills of the students. One needs to think and rethink the contribution of literature to intelligent thinking as well as its role in the process of teaching/learning. This article is, therefore, an attempt at exploring the nature of the literary experience in the present-day classrooms and the broader role of literature in life.

Cultural aspects of classroom effectiveness: Overseas-educated students in Australian classrooms

Teachers who are new to the country often find themselves as 'the stranger' in their own classroom. Languages education is one area where such overseas-educated teachers are common. The study reported here investigated what cultural factors might influence the classroom performance of such teachers. The early classroom experience of beginning Japanese native speaker teachers and trainees was examined to this end.

Some translation difficulties in the use of false friends in english

This paper will focus on some aspects of translation based on blending distinct linguistic domains such as English Language and Portuguese in using false friends in the English class in tertiary level students, reflecting namely on: 1. the choice of a word suitable to the context in L2 ; 2. the difficulties encountered by choice of that word that could be misleading, by relying in a false L1 reality that is going to adulterate reality in the L2 domain; 3. the difficulty in making such type of distinctions due to the lack of linguistic and lexical knowledge. 4. the need to study the cause of these difficulties by working, not only with their peers, but also with their language teacher to develop strategies to diminish and if possible to eradicate this type of linguistic and, above all, translation problem by making an inventory of those types of mistakes. In relation to the first point it is necessary to know that translation tasks involve much more than literal concepts ( Ladmiral, 1975) : furthermore it is necessary and suitable to realise that lexicon relies in significant contexts (Coseriu 1966), which connects both domains, that, at first sight do not seem to be compatible. In other words, although students have the impression they dominate lexicon due to the fact that they possess at least seven years of foreign language exposure that doesn’t mean they master the particularities engaged in such a delicate task as translation is concerned. There are some chromaticisms in the words (false friends), that need to be researched and analysed later on by both students and language teachers. The reason for such state of affairs lies in their academic formation, of a mainly general stream, which has enabled them only for knowledge of the foreign language, but not for the translation as a tool as it is required only when they reach the tertiary level. Besides, for their translations they rely, most of the times, on glossaries, whose dominant language is portuguese of Brazil, which is, obviously, much different from the portuguese mother tongue reality and even more of English. So it seems necessary to use with caution the working tools (glossaries) that work as surpluses, but could bring translation problems as we will see.

Conceções e práticas dos professores de língua portuguesa em relação ao ensino e à aprendizagem da gramática: um estudo exploratório no 2.º ciclo do ensino básico

Dissertação apresentada à Escola Superior de Educação de Lisboa para obtenção do grau de Mestre em Didática da Língua Portuguesa no 1.º e no 2.º Ciclos.

O portefólio em faixas etárias precoces: potencialidades e constrangimentos

Mestrado em Ensino Precoce do Inglês

A importância dos média e da língua de acolhimento na integração de imigrantes. Estudos de caso : a comunidade nepalesa de Portugal e a comunidade portuguesa em Macau

Esta pesquisa foca-se na comunidade imigrante portuguesa em Macau e na comunidade imigrante nepalesa em Portugal. Analisa os usos dos média – étnicos, mainstream e transnacionais - por imigrantes durante o processo de integração: na manutenção de laços com o país de origem e na adaptação à sociedade de acolhimento, em que a língua de acolhimento assume um papel crucial. A investigação enquadra-se nos estudos de audiências e baseia-se na teoria dos Usos e Gratificações dos Média (Katz, Blumler, & Gurevitch, 1974). No que respeita à integração assenta no modelo de estratégias de aculturação de Berry & Sam (2001, 2006). Quanto à língua, assenta na teoria do poder e da prática de Bourdieu (1991), especificamente na parte relativa ao poder simbólico da língua. Quanto à metodologia, foram realizadas oito entrevistas em profundidade na comunidade nepalesa e 29 entrevistas na comunidade portuguesa. A amostra foi de conveniência e teoricamente sustentada. A seguir às entrevistas, foi feita uma análise de conteúdo individual e transversal. Esta tese pretende contribuir para o enriquecimento de linhas de investigação sobre audiências activas dos média. Poderá servir de fonte de informação para políticas relacionadas com a integração de imigrantes, nomeadamente, para reformulação de políticas relacionadas com os média e com a língua de acolhimento. No caso de empresas de comunicação, a informação obtida poderá ser útil para adaptarem melhor os seus conteúdos a este público específico.

As metas curriculares de português: como as percecionam os professores do 5.º e do 7.º anos de escolaridade

Dissertação de mestrado em Ciências da Educação (área de especialização em Supervisão Pedagógica na Educação em Línguas)

Increasing Students Vocabulary in Efl Class

After reviewing the literature, this work tries to show the importance of teaching vocabulary fõr students’ literacy skills, especially, reading comprehension. Many researchers suggest that the greatest amount of vocabulary growth occurs through incidental word learning in wide reading, and, research indicates that vocabulary instruction is an important vehicle for vocabulary learning. (Anderson& Nagy, as cited in Harmon, 1992, p.306). Word knowledge is one of the best ways of successful reading and comprehension. “Reading enhancement correlates with reader’s vocabulary” (Im, 1994, p.12). Therefore, today’s language teachers and researchers have realized the important role of vocabulary in reading comprehension. A survey carried out on 10th, 11th and 12th grade students, regarding their reading comprehension, shows that unknown words is one of the factors which influences their ability to read and comprehend a passage. It also shows that students feel the need to be instructed on strategy when encountering new words and consequently improving their vocabulary. This inhibits their understanding of a reading selection. As a result it is crucial that teachers equip students with methodological tools to be employed when they encounter unknown words. There are a lot systematic approaches for discerning which skills and words a teacher should focus on and meaningful classroom activities to reinforce the words and strategies that teachers can use to help students increase their word knowledge. Finally research indicates that developing students’ vocabulary correlates with success in all areas of curriculum (Edger, 1999, p.14). The success of vocabulary development depends on students’ active process of learning and strategies used by teachers.

Materials and supplementary materials used to teach vocabulary in the English class

This study is based on the analysis of the use of supplementary materials to teach vocabulary by second language teachers in Primary Education. The study consists of two analyses: the first one is a quantitative analysis based on 33 questionnaires answered by different second language teachers of Primary Education. The other, is a qualitative analysis in which the teacher’s subjective opinion on vocabulary learning techniques is presented. The study covers these main aspects: material use, effectiveness, children’s motivation, main criteria to teach vocabulary and the children’s role in their vocabulary learning.

English as a medium of instruction in teaching other languages: attitudes and practices

Internationalisation of HE and emergence of English as a global academic lingua franca used by people who share neither a common native tongue nor cultural and educational background have not only offered more opportunities but also raised challenges. According to recent European surveys, the percentage of pupils attaining the level of independent user in English varies from 14% to 82%, which evidences the potential and the complexity for English as a medium of instruction at tertiary level. This study aims to present the model of foreign language instruction at Vytautas Magnus University where one third of 30 languages are taught through English. It investigates the attitudes and practices of teachers in delivering their English-medium language courses by discussing the questions whether teaching other languages through English is psychologically, culturally and educationally preferable for teachers and students, whether it can limit the content taught and require a special methodology, how the teaching process changes with multiple languages used in the classroom and what level of English is necessary for teachers and students to ensure high quality of English-medium language teaching. The study is based on qualitative methodology with 12 language teachers participating as respondents. The results reveal areas in need of improvement.

Kielikeskuksissa toimivien kieltenopettajien käsityksiä ja kokemuksia massayliopiston luomista haasteista

Challenges of mass university conceived and experienced by university language centre language teachers The massification of the university involved not only an expansion but also a transition from one period to another, from elite higher education to mass higher education. Massification cannot be viewed as expansion and structural change but it has to be viewed in a context of a number of changes involving universities, state, economy, society and culture as well as science, technology, education and research. In the Finnish academic context, massification is often associated with negative development and it may be used as an excuse for poor teaching. The objective of the present study is to find out how the mass context is manifested in the work of university language centre language teachers. The data were collected by means of semi-structured questionnaires from 32 language teachers working at language centres at the universities of Helsinki, Jyväskylä, Tampere and Turku in Finland. Both Finnish and native speakers, 6 male and 26 female teachers, were included. All the teachers in the study had taught more than 10 years. The data were complemented by interviews of four teachers and email data from one teacher. Phenomenographic analysis of the informants’ conceptions enabled a description of their experiences of students at a mass university, conceptions of teaching and learning and of issues related to work health. Some conceptions were consonant with earlier results. The conceptions revealed differences between two teacher groups, teachers of subject-specific language, or language for specific purposes (LSP), and teachers of elementary and advanced language courses (general language teachers). For the first, the conceptions of the investigated teachers provided a picture of the students as a member of a mass university. The students were seen as customers who demanded special services to facilitate their studies or were selective about the contents of the course. The finding that appeared only in the LSP teachers’ data was the unengaged attitude towards language study, which appeared as mere hunt for credits. On the other hand, the students were also seen as language learning individuals, but a clear picture of a truly interested language learner was evident in the data of general language teachers. The teachers’ conceptions of teaching and learning revealed a picture of experienced teachers with a long background of teaching, reflecting experiences from different time periods and influences from their own education and illustrating the increasing problems with organizing individual tutoring due to large, heterogeneous groups. It seemed, however, that in spite of the large student groups, general language teachers were able to support the students’ learning processes and to use learner-centred methods, whereas LSP teachers were frequently compelled to resort to knowledge transmission type of teaching. The conditions of the mass university were clearly manifested in the respondents’ conceptions about work satisfaction: there were a number of factors related to administration, teaching arrangements and the status of the language centres that were likely to add to the teachers’ work stress, whereas traditional characteristics of academic work were viewed as promoting work satisfaction. On the basis of the teachers’ conceptions, it is safe to assume that academic mass context and students’ orientations have an effect on the teacher’s approach to teaching, while there is no unequivocal association between mass university teaching and poor teaching.

The cultural dimension in focus : promoting awareness of diversity and respect for difference in a Finland-Swedish EFL classroom

This study addresses the role of EFL education, its potential and shortcomings, and the challenges the future of EFL education will bring. It is argued that new societal demands and the limited time we have at our disposal in the classroom make it necessary to rethink goals and content and move away from the transmissionof limited sets of facts and information to helping students develop awareness and competences that can be applied in many different situations, also in a perspective of lifelong learning. The overall aim of the current study is to problematize and increase understanding of the implementation of cultural aspects in the language classroom by addressing the interrelated what, why and how of the cultural dimension within EFL education. This has been conducted by means of theoretical explorations into the area, alongside an attempt at promoting intercultural competence (IC) in a more systematic and insightful manner within my own educational praxis. The focus of the intercultural work in the classroom was on the promotion of awareness of difference and diversity, as well as respect for such difference through the ability to decenter from cultural norms and behavior that previously have been taken for granted. These are two elements that have been suggested as fundamental for other work with IC in the classroom and for the realization of important aspects of the underlying values of basic education. In the context of this study, IC comprises several interconnected components supportingeach other in a variety of ways, with the further aim being interaction with and respect for difference in general, not only concerning e.g. representatives ofcertain English-speaking communities. The methodology was informed by action research, with myself in the role of the teacher-researcher or the reflective practitioner. For the purpose of the project I was authorized to take on the EFL education for the three years of upper comprehensive school of one random class of students originally assigned to one of the language teachers of the selected Finland-Swedish school. Thus, the class of 17 students was not specifically chosen for the project, and the aims and contents chosen for the development project were placed within the framework of the ordinary curriculum. By exploring the students¿ insights concerning different English-speaking cultural groups, mainly through a set of questionnaires, it was possible to outline the work with the cultural dimension in the classroom for the following three years. Work progress was evaluated at specific stages, and the final project evaluations were conducted through individual student interviews in grade 9. The interviews were focused on possible development of students¿ insights concerning different aspects of the cultural dimension. In particular this concerned awareness of difference and diversity, including modification of stereotypes, as well as the ability to decenterin order to be better able to respect such difference. I also explored students¿ awareness and views of the activities and approaches used in class, as well asaffordances both inside and outside the EFL classroom in relation to these intended insights. A further focus area was the perceived relevance to students of different aspects of the cultural dimension. The frameworks and approaches adopted for the work in the classroom all have in common that they are based on a constructivist framework, where knowledge is constructed and reconstructed through interaction with one¿s social and cultural environment, including interaction with others. Reflective processes precede or are simultaneous with the learning of basic factual knowledge. This entails a view of learning as a progression from simple to more complex models rather than as a progression from facts to understanding and analysis. Here, the development of intercultural competence is seen asa cyclical process, or along a spiral curriculum, from simple to more complex levels through a combination of cognitive, affective and behavioral elements within a framework of experiential learning. This project has shown one possible wayforward concerning the development of intercultural competence within EFL education through a more systematic and comprehensive approach regarding linguistic and cultural aspects. The evaluation of the educational process explored in the study suggests the possibilities for work with the promotion of awareness of difference and diversity concerning some specific context that, based on students¿ prior knowledge and preconceptions, would benefit from further work. In this case, the specific context primarily concerned different aspects of both cultural and linguistic conditions in the UK. It is also suggested that many students developed the ability to decenter, described in the study as integral to being able to respect otherness. What still remains to be explored are more individualized approaches considering students¿ different levels of departure. Further work alsoneeds to be put into how to apply insights gained in these specific situations to more general contexts. It is also necessary to explore the use of the suggested approaches in a wider range of different contexts.