Cette thèse aborde différents aspects de la cryptologie, subsumant des champs aussi variés que la conception de protocoles, l’amélioration d’outils algorithmiques et les attaques. Les deux principales focales de cette étude sont : un protocole de co-signature prouvé irréfragable et un système de chiffrement authentifié à sécurité prouvée. Notre protocole de co-signature permet l’équité légale. L’équité légale est une nouvelle variante de la notion d’équité, ne reposant pas sur des tiers. Notre instanciation d’équité légale est construite à l’aide des signatures de Schnorr. Nous présenterons également un protocole d’authentification distribué de type Fiat-Shamir. La deuxième partie de cette thèse est consacrée aux améliorations algorithmiques. Nous introduisons une méthode permettant de doubler la vitesse de l’algorithme de Barrett en utilisant des modules composites spécifiques et un nouvel algorithme de multiplication à retour sur trace, particulièrement adapté aux microprocesseurs bon marché. Nous nous intéresserons ensuite à la sécurité des composants en étudiant la régulation du débit des correcteurs de von Neumann et les attaques en fautes sur des implémentations de cryptographie à courbes elliptiques. Enfin, un des actes novatoires incidents notre travail sera d’adapter aux codes correcteurs d’erreurs deux techniques empruntées à la cryptographie : un premier résultat améliore l’efficacité calculatoire des codes BCH grâce à une version de l’algorithme de Barrett étendue aux polynômes. Le second est un nouveau code correcteur d’erreurs basé sur la théorie des nombres. / This thesis addresses various topics in cryptology, namely protocol design, algorithmic improvements and attacks. In addition, we venture out of cryptography and propose two new applications of cryptographic techniques to error correcting codes. Our main results comprise a provably secure co-signature protocol and a provably secure authenticated encryption scheme. Our co-signature protocol achieves legal fairness, a novel fairness variant that does not rely on third parties. Legal fairness is implemented using Schnorr signatures. We also present a distributed Fiat-Shamir authentication protocol. The second part of the thesis is devoted to computational improvements, we discuss a method for doubling the speed of Barrett’s algorithm by using specific composite moduli, devise new BCH speed-up strategies using polynomial extensions of Barrett’s algorithm, describe a new backtracking-based multiplication algorithm suited for lightweight microprocessors and present a new number theoretic error-correcting code. Fault injection attacks are further overviewed and a new fault attack on ECC implementations is proposed.

The dissertation builds a bridge from the social-philosophical works of Hobbes, Rousseau, and Smith to current game theoretical models explaining social order to two empirical applications in a rural region of Guinea. The work focuses on the central role of natural resources for human societies and uses two empirical studies to test general hypotheses on the drivers of the sustainable exploitation and the equitable distribution of natural resources. The work strictly follows a quantitative empirical approach. After discussing the methodological foundations of statistical causal analysis in a first step, the various approaches are evaluated in a simulation study. Finally, the most successful of these approaches finds its application in the analysis of the empirical data, which was collected during field research in Guinea. In the observational study, socioeconomic data are combined with environmental data to model the influence of humans on the occurrence of wild species that are exploited for economic purposes in the study area. In the experimental study, socioeconomic data is linked to experimental data from a resource distribution game to identify factors affecting the people’s behavior when sharing a common natural resource. Both the exploitation of wild species and the sharing of a natural resource show that the social context is crucial for the understanding of human behavior, as postulated by Hobbes, Rousseau, and Smith: reputation, market integration, inequality and homogeneity of the population, as well as the salience of moral norms and property rights are essential dimensions. / Die Dissertation widmet sich der zentralen Rolle von natürlichen Ressourcen für menschliche Gesellschaften. Anhand zweier empirischer Studien werden allgemeine Hypothesen zu den Determinanten der nachhaltigen Ausbeutung und gerechten Verteilung von natürlichen Ressourcen getestet. Dabei wird in der Arbeit eine Brücke von den Werken der Sozialphilosophen Hobbes, Rousseau und Smith, über aktuelle spieltheoretische Modelle zur Erklärung sozialer Ordnung, hin zu zwei empirischen Anwendungen in einer ländlichen Region Guineas geschlagen. Die Arbeit folgt strikt einem empirischen quantitativen Ansatz. Nach der Erörterung der methodischen Grundlagen der statistischen Kausalanalyse werden die verschiedenen Ansätze im Rahmen einer Simulationsstudie evaluiert. Schließlich findet der erfolgreichste dieser Ansätze in der Auswertung der Daten, die bei der Feldforschung in Guinea erhoben wurden, Anwendung. In der Beobachtungsstudie werden sozioökonomische Daten mit ökologischen Daten verknüpft, um den Einfluss der Menschen auf das Vorkommen von wilden Arten, die zu ökonomischen Zwecken ausgebeutet werden, im Untersuchungsgebiet zu modellieren. In der Experimentalstudie werden sozioökonomische Daten mit Experimentaldaten aus einem Ressourcenverteilungsspiel verknüpft, um Faktoren zu identifizieren, welche sich auf das Verhalten von Menschen beim Teilen einer gemeinsamen natürlichen Ressource auswirken. Sowohl für die Ausbeutung der wilden Arten, wie auch für das gemeinsame Teilen einer natürlichen Ressource gilt, dass der soziale Kontext für das Verhalten der Menschen von großer Relevanz ist, wie von Hobbes, Rousseau und Smith postuliert: Reputation, Marktintegration, Ungleichheit und Homogenität der Bevölkerung sowie die Salienz moralischer Normen und Eigentumsrechte sind entscheidende Dimensionen.

Magister Legum - LLM / The so called business judgment rule (hereinafter referred to as ―the BJR or the rule‖) that serves to protect directors from liability for negative consequences of honest, reasonable business decisions that went wrong, was developed by the American judiciary in the early 19th Century.2 Percy v. Millaudon, a Louisiana Supreme Court decision quoted above, articulated what is now referred to as the BJR.3 This case provides the earliest expression of the American BJR.4 Delaware courts subsequently issued a series of cases formulating the BJR as a presumption.5 Although the earliest expression of the rule was provided by a Louisiana court, the dissertation will focus on the Delaware case law formulation of the rule.6 The essence of the BJR is that judges should not second guess directors‘ decisions if certain elements of the BJR are fulfilled.7 Courts are required to exercise caution when dealing with claims brought by either stakeholders or shareholders against directors who have made bona fide, also referred to as good faith, business decisions.8 In order to be protected by the BJR and for it to act as a safe harbour, the court will determine whether certain requirements have been met before applying the rule.9 The Delaware courts formulated the BJR as a presumption and in order for directors to be protected by the rule they must have made an informed business decision, in good faith and in the honest belief that the decision will be in the best interest of the company.10 As will be discussed later, this formulation of the rule is referred to as the traditional BJR. In addition to the aforementioned formulation, another formulation was provided by the American Law Institute (hereafter referred to as the ―ALI formulation‖).11 Initially there had been difficulties codifying the ALI version of the rule but later it was successfully codified in paragraph 4.01(c) of the ALI Corporate Governance Project.12 This formulation requires a director to ensure that he has no personal interest in the matter, he is reasonably informed of the matter prior to making the decision and he rationally believes the decision will be in the best interest of the company.13 If the director complies with the aforementioned requirements, the director will be considered to have acted in good faith.14 Directors owe fiduciary duties to the company and in instances where they breach one or more of these duties they can incur personal liability.15 The rule thus emerged because of the need to protect directors and it serves as a safe harbour for those individuals who made a decision in conformity with the aforementioned requirements.16 In commercial terms the rule bestows economic freedoms and freedom of entrepreneurship to directors guided, in any case, by ―the best interest of the company‖.17 The most commonly cited reasons for the existence of the rule are that it promotes risk taking, encourages competent persons to serve as directors, prevents judicial second-guessing and promotes judicial efficiency. It further provides directors with sufficient freedom to manage the company and it ensures that the interest of shareholders and those of directors are balanced.18

The diploma thesis deals with the concept of fairness perception by pupils of primary school. The aim of this work is to get to know the ways in which children at primary school think about fairness and what they consider fair and unfair. The theoretical part describes approaches to the topic in terms of psychology, pedagogy and ethics. The theoretical part consists of three main chapters. The first chapter deals with the concept of fairness and possible interpretations of this word. In the second chapter, the reader reads about the different concepts of moral reasoning. The thesis introduces the reader to the concept of moral development by Jean Piaget and the stage theory of Lawrence Kohlberg. The thesis also describes some theories of moral reasoning created by some of Kohlberg's followers or critics. The third chapter identifies some determinants that can influence moral reasoning when dealing with primary school pupils. The practical part consist of a research probe concerning the moral reasoning of pupils. This research probe works with a moral dilemma created by Jean Piaget. The moral dilemma concerns the perception of fairness and works with fair punishment. This dilemma is discussed with pupils in group interviews. The research probe was conducted with pupils of the second and third grade...

<div>This study explores the vertical relationships in the supply chain at three different levels, namely, firm-consumer interface, supplier-buyer interface, and firm-government interface. We provide a brief description of the results obtained for the specific problems considered in this study.</div><div><br></div><div><div>The firm-consumer interface is examined in Chapter 2. We explore firms’ selling strategy when dynamically competing for a common stream of consumers. In the situation of pure price competition, a commonly studied case, it is known that the </div><div>seller with a higher stock level can compete more effectively by forcing the seller with a lower stock level to sell out first and enjoy a monopoly power afterward. We show that when the sellers are open to price bargaining as a way of attracting buyers, the </div><div>competition equilibrium can exhibit different outcomes. When the overall stock held by the sellers is limited, there is a good chance that both sellers deplete the inventories before the end of the selling season. In this case, an incoming buyer would prefer a</div><div>high inventory seller, with whom he can bargain down the price. Interestingly, such a phenomenon only appears when the length of selling season is long enough. Thus, our study highlights the unique role of bargaining in consumer markets, as well as the importance of time horizon in characterizing equilibrium for dynamic games.</div></div><div><br></div><div>The supplier-buyer interface is studied in Chapter 3. In recent years, an increasing number of studies have applied the Nash bargaining (NB) solution to study channel relationships. However, this solution concept builds on an unrealistic axiom of independence of irrelevant alternatives. We demonstrate that, indeed, the NB solution can produce unreasonable outcomes in vertical negotiations. For example, a supplier negotiating with a monopoly retailer can end up making a higher profit than the one negotiating with a retailer facing potential competitions. To address this issue, we examine the Kalai-Smorodinsky (KS) solution as an alternative. Our analysis suggests that in competing supply chains, the KS solution appropriately captures the negotiation power shift induced by the decision ownership, the negotiation sequence, the vertical relationship, the competition intensity, the contract contingency, and the contract type. This is the first time the KS solution concept is applied to supply chain negotiations.<br></div><div><br></div><div>The firm-government interface is explored in Chapter 4. From the policymakers’ perspective, incentives firms actions toward increasing the product consumption for the needy group or increasing social welfare has a major influence in many supply chains. For example, agricultural products are subsidized by many governments. In this study, we analyze the design of government subsidy programs to induce socially improved firm decisions. We show that subsidizing on production input can lead to a more balanced distribution of market shares and firm profits than subsidizing on production output. Moreover, firms with efficient production technology prefer output subsidy, while those with inefficient production technology favor input subsidy<br></div>

Smart devices have become one of the fundamental communication and computing devices in people's everyday lives over the past decade. Their various sensors and wireless connectivity have paved the way for a new application area called mobile crowdsensing where sensing services are provided by using the sensor outputs collected from smart devices. A mobile crowdsensing system's service quality heavily depends on the participation of smart device users who probably expect to be compensated in return for their participation. Therefore, mobile crowdsensing applications need incentive mechanisms to motivate such people into participating. In this thesis, we first defined a reverse auction based incentive mechanism for a representative mobile crowdsensing system. Then, we integrated the Vickrey-Clarke- Groves mechanism into the initial incentive mechanism so as to investigate whether truthful bidding would become the dominant strategy in the resulting incentive mechanism. We demonstrated by theoretical analysis that overbidding was the dominant strategy in the base incentive mechanism, whereas truthful bidding was the dominant strategy in the derived incentive mechanism when the VCG mechanism was applicable. Finally, we conducted simulations of both incentive mechanisms in order to measure the fairness of service prices and the fairness of cumulative participant earnings using Jain's fairness index. We observed that both the fairness of service prices and the fairness of cumulative participant earnings were generally better in the derived incentive mechanism when the VCG mechanism was applied. We also found that at least 70% of service requests had fair prices, while between 5% and 85% of participants had fair cumulative earnings in both incentive mechanisms.

Bakgrund: Det svenska näringslivet präglas av digitalisering. Därtill har dagens företag anpassat sig efter omgivningen och bedriver sina processer mer digitalt. Inom området Human Resources är rekryteringsprocessen under digital konstruktion, med fördelar för företag i form av tid och kostnadseffektivitet. I denna förändring är kandidaters perspektiv av digitala steg i rekryteringsprocessen ett begränsat forskningsområde. Kandidatupplevelsen ska vårdas under rekryteringsprocessens förlopp i syfte att behålla ett gott företagsrykte på marknaden. Däremot är en upplevelse något som kan variera från individ till individ vilket kan tas i beaktande vid val av olika digitala rekryteringsmetoder. Denna studies syfte kan bidra till forskning och företag genom att beskriva vad som är en bra respektive sämre kandidatupplevelse av de olika stegen som tillämpas i den digitala rekryteringsprocessen. Syfte: Att beskriva kandidaters upplevelse av en digital rekryteringsprocess.  Metod: Studien har induktiv forskningsansats med viss deduktivism då syfte är baserat på förkunskap. För att beskriva kandidaters upplevelse har en kvantitativ forskningsmetod med tvärsnittdesign genomförts med en enkätundersökning bestående av 111 respondenter. För att nå en beskrivning ligger statistisk empiri i grund för att se variationer och samband i kandidaters upplevelser. Genomgående har studien ett tolkande och konstruktionistiskt förhållningsätt då upplevelser är av social konstruktion, därtill har empiri tolkats med en kvalitativ teoretisk förankring i forskningsområdet.  Slutsats: Empiriskt resultat visar på att kandidater har övergripande bra upplevelser av en digital rekryteringsprocess, däremot förekommer det variationer i värdering av upplevelse beroende av vilken urvalsmetod som tillämpas. Tillsammans med kvalitativ teoretisk tolkning kan slutsats dras att huruvida upplevelse är av bra eller sämre karaktär, är beroende av kandidatens erfarenhet av teknologi, kandidatens egen upplevelse av en rättvis bedömning samt kvalitén på digital kommunikation från rekryterare. / Background: The Swedish industry is influenced by digitalization which is seen among companies who have transformed their processes to digitalized. Within the field of Human Resources, it is acknowledged that the recruitment process is becoming more digitalized. This has given companies advantages in terms of cost and time efficiency. The job candidates’ perspective in this digital change is not a broadly explored research subject. For companies it is important to stimulate the candidate experience to keep a good reputation on the job market. Although, an experience can be valuated differently depending on the individual. This study could therefore contribute to research in the area and give practical implications for companies, with a description of a good and less good experience of digital elements in the recruitment process.  Purpose: To describe candidates’ experiences of a digital recruitment process  Method: The study has an inductive approach with a certain deductivism, based on prior knowledge in the research field. A cross-sectional study of quantitative nature was realized through a survey consisting of 111 respondents. The survey contributed with empirical statistics of variations and relationships between candidates’ experiences. The study applies an interpretative approach towards individual experiences. Therefore, is empirical statistics interpretated with a qualitative literature research in the area.  Conclusion: The empirical results showed that candidates’ share an overall good experience of a digital recruitments process but variations in individual experiences were identified depending on selection and assessment methods. The conclusion of the empirical results and qualitative interpretation of the results is that candidates have an overall good experience of a digital recruitment process and how the candidates´ valuates his or her experience can be dependent on technological knowledge, perceived fairness and quality of digital communication.

Indiana University-Purdue University Indianapolis (IUPUI) / This thesis combines human and machine intelligence for consensus decision-making, and it contains four interrelated research areas. Before presenting the four research areas, this thesis presents a literature review on decision-making using two criteria: trust and risk. The analysis involves studying the individual and the multi-stakeholder decision-making. Also, it explores the relationship between trust and risk to provide insight on how to apply them when making any decision. This thesis presents a grouping procedure of the existing trust-based multi-stakeholder decision-making schemes by considering the group decision-making process and models. In the first research area, this thesis presents the foundation of building multi-stakeholder consensus decision-making (MSCDM). This thesis describes trust-based multi-stakeholder decision-making for water allocation to help the participants select a solution that comes from the best model. Several criteria are involved when deciding on a solution such as trust, damage, and benefit. This thesis considers Jain's fairness index as an indicator of reaching balance or equality for the stakeholder's needs. The preferred scenario is when having a high trust, low damages and high benefits. The worst scenario involves having low trust, high damage, and low benefit. The model is dynamic by adapting to the changes over time. The decision to select is the solution that is fair for almost everyone. In the second research area, this thesis presents a MSCDM, which is a generic framework that coordinates the decision-making rounds among stakeholders based on their influence toward each other, as represented by the trust relationship among them. This thesis describes the MSCDM framework that helps to find a decision the stakeholders can agree upon. Reaching a consensus decision might require several rounds where stakeholders negotiate by rating each other. This thesis presents the results of implementing MSCDM and evaluates the effect of trust on the consensus achievement and the reduction in the number of rounds needed to reach the final decision. This thesis presents Rating Convergence in the implemented MSCDM framework, and such convergence is a result of changes in the stakeholders' rating behavior in each round. This thesis evaluates the effect of trust on the rating changes by measuring the distance of the choices made by the stakeholders. Trust is useful in decreasing the distances. In the third research area, this thesis presents Rating Convergence in the implemented MSCDM framework, and such convergence is a result of changes in stakeholders' rating behavior in each round. This thesis evaluates the effect of trust on the rating changes by measuring the perturbation in the rating matrix. Trust is useful in increasing the rating matrix perturbation. Such perturbation helps to decrease the number of rounds. Therefore, trust helps to increase the speed of agreeing upon the same decision through the influence. In the fourth research area, this thesis presents Rating Aggregation operators in the implemented MSCDM framework. This thesis addresses the need for aggregating the stakeholders' ratings while they negotiate on the round of decisions to compute the consensus achievement. This thesis presents four aggregation operators: weighted sum (WS), weighted product (WP), weighted product similarity measure (WPSM), and weighted exponent similarity measure (WESM). This thesis studies the performance of those aggregation operators in terms of consensus achievement and the number of rounds needed. The consensus threshold controls the performance of these operators. The contribution of this thesis lays the foundation for developing a framework for MSCDM that facilitates reaching the consensus decision by accounting for the stakeholders' influences toward one another. Trust represents the influence.

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Over the past decade, the use of asynchronous video interviews (AVIs) has increased exponentially, largely spurred by ongoing technological progress and shifts to remote work. Although prior research shows interview design can influence applicant reactions, the effect of video interview design factors on interviewee reactions remains unclear. The present study determines the influence of AVI stimulus format (text-based vs. audio-visual questions) on applicant perceptions of social presence, fairness and organisational attractiveness. To this end, a between-subjects posttest-only experimental design was used in two separate samples (South African sample, N = 58; USA sample, N = 169, Combined samples, N = 227). Participants were randomly assigned to either the control or experimental group. Participants completed a mock interview on a commercially available AVI platform and then answered a questionnaire measuring perceptions of social presence, fairness, and organisational attractiveness. Bootstrapped independent sample t-tests and serial mediation were used to test the hypotheses. Within Sample 1, applicant perceptions of social presence, fairness and organisational attractiveness were higher for the audio-visual and text-based AVIs, thereby supporting the proposition that audio-visual stimuli lead to higher perceptions of social presence, fairness and organisational attractiveness. Conversely, Sample 2's findings were non-significant (p > .05). While there were mixed results, the findings of this study provide preliminary evidence which suggests that within the South African context, audio-visual stimuli can be used in AVIs. Organisations in the American context should pay close attention to the effects of AVI stimulus format on applicant reactions as the findings from the American sample were not conclusive. Future research should investigate applicant reactions to different forms of AVI stimulus during a multi-stage selection process