Blind Schnorr Signatures and Signed ElGamal Encryption in the Algebraic Group Model

Author(s):  
Georg Fuchsbauer ◽  
Antoine Plouviez ◽  
Yannick Seurin
2015 ◽  
Vol 1 (3) ◽  
pp. 69
Author(s):  
Arjan Skuka

Despite the fact that introductory programming courses (IPCs) are taught at universities for more than thirty years, students still find computer programming very difficult to learn. Programming pedagogy deals with the methods and principles of teaching and learning computer programming. The programming pedagogical approaches that have been proposed to increase the efficiency of teaching and learning computer programming mostly focus on the tools, paradigms, programming languages and environments used in IPCs. To increase significantly the students’ success rates in IPCs, these approaches should be complemented with pedagogical explanation (PE) methods. This research is focused on a PE method of teaching sequential search of a matrix row (SSMR). The research was designed as experimental study with pretest-posttest control group model, involving students of Computer Engineering department Izmir University. While the experimental group was subjected to a pedagogical explanation method, a traditional explanation method was applied in the control group. To collect the research data, an achievement pretest, posttest and a questionnaire were developed and applied. The research findings showed the effectiveness of teaching SSMR by using a PE method. This method positively influenced students’ level of topic comprehension, which consequently improved their achievements. In order for students to understand better the other matrix programming operations, similar PE methods should be developed and used in IPCs. On a more general level, the results of this research suggested that PE methods should be developed and used for other topics that students usually find difficult to understand in IPCs. Using these methods can be a very important factor in significantly increasing students’ success in IPCs.


2020 ◽  
Author(s):  
Randolph C Grace ◽  
Nicola J. Morton ◽  
Matt Grice ◽  
Kate Stuart ◽  
Simon Kemp

Grace et al. (2018) developed an ‘artificial algebra’ task in which participants learn to make an analogue response based on a combination of non-symbolic magnitudes by feedback and without explicit instruction. Here we tested if participants could learn to add stimulus magnitudes in this task in accord with the properties of an algebraic group. Three pairs of experiments tested the group properties of commutativity (Experiments 1a-b), identity and inverse existence (Experiments 2a-b) and associativity (Experiments 3a-b), with both line length and brightness modalities. Transfer designs were used in which participants responded on trials with feedback based on sums of magnitudes and later were tested with novel stimulus configurations. In all experiments, correlations of average responses with magnitude sums were high on trials with feedback, r = .97 and .96 for Experiments 1a-b, r = .97 and .96 for Experiments 2a-b, and ranged between r = .97 and .99 for Experiment 3a and between r = .82 and .95 for Experiment 3b. Responding on transfer trials was accurate and provided strong support for commutativity, identity and inverse existence, and associativity with line length, and for commutativity and identity and inverse existence with brightness. Deviations from associativity in Experiment 3b suggested that participants were averaging rather than adding brightness magnitudes. Our results confirm that the artificial algebra task can be used to study implicit computation and suggest that representations of magnitudes may have a structure similar to an algebraic group.


2021 ◽  
Vol 13 (16) ◽  
pp. 8733
Author(s):  
Gisela Cebrián ◽  
Mercè Junyent ◽  
Ingrid Mulà

The 2030 Agenda for Sustainable Development reflects the urgency to embed the principles of education for sustainable development (ESD) into all levels of education. ESD, understood as an integral part of quality education and where all educational institutions, from preschool to higher education and in non-formal and informal education, can and should foster the development of sustainability competencies. This Special Issue entitled “Competencies in Education for Sustainable Development II” responds to this urgency and the papers presented deliver recent developments in the field of sustainability and ESD competencies. They focus on various perspectives: systematic literature reviews and conceptual contributions; curriculum developments and pedagogical approaches to explore competencies’ development, such as action research, serious games, augmented reality, multi-course project-based learning and group model building processes; testing and validation of assessment tools and processes for linking sustainability competencies to employability and quality assurance processes. The contributions show how the field of sustainability and ESD competencies has become a major focus in recent years and present emerging research developments. Further research efforts need to be put into operationalizing sustainability competencies and developing tools that help measure and assess students’ and educators’ competencies development.


2021 ◽  
Vol 11 (3) ◽  
pp. 35
Author(s):  
Diana Escandon-Barbosa ◽  
Andrea Hurtado ◽  
Alina Gomez

Global pandemics are not a new phenomenon. They have occurred at different points in time and can be of different scales. COVID-19 appeared in 2020 and its spread has reached more than 60 countries worldwide. This research aims to analyze voluntary self-isolation behavior used to cope with the COVID-19 pandemic. As part of this study, we carried out sampling in Colombia and Spain, which share similar cultural characteristics but which have substantial social and economic differences. A multi-group model was used to test the application of the theory of planned behavior and the theory of reasoned action in order to analyze self-isolation behavior. The results show that there are differences in self-isolation behavior between both countries, especially with regard to attitudes towards self-isolation and volitional behavior.


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