Thesis (MPA (School of Public Management and Planning))--University of Stellenbosch, 2009. / m-Government or mobile-Government is seen as part of e-Government and an additional channel for the delivery of public services and information to the citizen. This study critically examines and evaluates the extent to which the Provincial Government Western Cape has adopted m-Government and implemented related services. A survey conducted by Kirsten (2006) on the adoption and readiness of mobile technology by businesses in South Africa was used as the foundation of this study to determine the level of readiness in the Provincial Government Western Cape. Managers and technical staff within the Province’s information and communication technology component, the Centre for e-Innovation, were interviewed and asked to complete the survey. The study found that, although there is a relatively high degree of adoption with regard to various aspects of mobile and wireless technology, there are many obstacles and barriers that need to be overcome in order to achieve a higher level of m-Government maturity or readiness. The study makes various suggestions on how to overcome these barriers. The most important suggestion is to develop a holistic approach to the adoption of m-Government. Plans for adoption should be incremental to ensure that small victories that can be built on are achieved; the involvement of key stakeholders is also essential.

面對資訊科技發展全球化的趨勢與挑戰，網際網路成為各國政府治理的重要手段，我國自1997年推動電子化政府以來，在各界的努力之下，無論在家戶連網率、網路使用率及行動上網率等基礎設施上都已達成相當不錯的水準，電子化政府並獲得不同國際評比的肯定，突顯出我國在推動電子化政府之成效，電子化政府服務亦是政府與民眾間一種交流與溝通不可或缺的方式。 本研究以臺北市信義區公所為研究標的，在我國電子化政府受國際優良評比的前提下，落實在最基層的為民服務機關電子化政府服務，提出相關的研究問題，以了解實務上所提供電子化政府服務的實際執行情形為何，是否為民眾帶來優渥的便利性或是遭遇那些困難點，或只是徒具形式的電子化服務，並探究民眾的使用需求或使用行為是否有哪些改變，藉由研究發現，弱勢民眾及年長者之數位落差、電子化服務身份認證之限制、民眾對於電子化服務管道的陌生、民眾使用電子化服務申辦之誘因不足及對電子化服務系統行動化之需求等。 針對上述研究發現，本研究對臺北市信義區公所電子化服務措施，提出重新定位區公所電子化服務類別、電子化服務邁向行動化、強化區公所電子化政府服務誘因及宣導電子化服務管道、結合民眾資源等四大面向之具體建議，做為基層為民服務機關電子化服務措施精進之參考。 / Faced with the globalization of information technology development trends and challenges, Internet governance has become an important means of Governments, to promote our country since 1997, e-government, under the efforts of all walks of life, regardless of the rate of home Internet users, Internet use rate and rate mobile Internet infrastructure have reached a very good level, e-government and access to various international competitions certainly highlights the country in promoting the effectiveness of e-government, e-government services between government and the public is also a exchange and communication an integral way. In this study, the Taipei Xinyi District Office to study the subject in the context of e-government by the international rating of excellent, implemented in the most basic institution serving the public e-government services, proposed research questions related to the understanding of practice provided e-government services, the actual implementation of the case and whether it is privileged to bring the convenience of the public or the difficulties encountered point, or just a formality of electronic services, and explore people's needs or whether there are some changes in usage behavior, by study found that older people vulnerable populations and the digital divide, e-service authentication of the restrictions, the public electronic services for the pipeline strange lack of people to use electronic services sponsor of the incentives and demand for electronic service system of the action Wait. In response to these findings, this study Xinyi District Office in Taipei electronic service measures proposed repositioning of the district office e-services category, e-services oriented toward action, strengthening incentives for district office e-government services and advocacy e-Services pipeline, combined with the people and resources for the four specific recommendations, serving the public authorities as a reference grassroots measures sophistication of electronic services.

Abstract The popularity of social networking services emphasises the importance of user communities. As the next evolutionary step, social networking will evolve towards user communities that are dynamically established according to contextual aspects such as the shared location and/or activities of people. In this vision, distributed peer-to-peer (P2P) technologies provide a respectable alternative to the centralised client-server technologies for implementing the upcoming community-centric mobile services. This thesis focuses on the development of enabling techniques and methods for a community-centric mobile service environment and on the evaluation of users’ perceptions and user acceptance of novel community-centric mobile services. The research was carried out by first examining the applicability of different P2P system architectures for implementing the management of user communities. Next, an experimental prototype of a community-centric mobile service environment was implemented. The experimental prototype was used for evaluating the performance of the community-centric mobile service environment and for conducting the user studies of novel community-centric mobile services. The evaluation was conducted in a real deployment environment with test users. The main results are the following: (1) a conceptual analysis of the advantages and disadvantages of P2P group management systems that are implemented using architecturally distinct P2P system architectures; (2) a performance evaluation of a P2P community management system, in which each community is implemented as an independent structured P2P overlay network; (3) a novel community-centric mobile service environment and its core component, a mobile middleware, which enables the use of P2P technologies and context information as part of Web-based applications running on a Web browser; (4) an evaluation of users’ perceptions and user acceptance of novel community-centric mobile services that are related to making a selection of an entertainment premise based on its music style and voting for music in a user community. / Tiivistelmä Käyttäjäyhteisöiden tärkeys on korostunut sosiaalista verkottumista edistävien palveluiden suosion kautta. Seuraavaksi sosiaalinen verkottuminen tulee laajentumaan yhteisöihin, jotka perustetaan dynaamisesti muun muassa ihmisten yhteisen sijainnin ja/tai toiminnan perusteella. Tulevaisuuden yhteisöllisten mobiilipalveluiden toteutuksessa hajautetut vertaisverkkoteknologiat tarjoavat varteenotettavan vaihtoehdon keskitetyille asiakas-palvelin -teknologioille. Tämä väitöskirjatyö keskittyy kehittämään tarvittavia tekniikoita ja menetelmiä yhteisöllisen mobiilipalveluympäristön toteuttamiseen sekä arvioimaan käyttäjien kokemuksia uusista yhteisöllisistä mobiilipalveluista. Tutkimuksessa tarkasteltiin aluksi arkkitehtuurillisesti erilaisten vertaisverkkojärjestelmien sopivuutta käyttäjäyhteisöjen hallinnan toteutettamiseksi. Seuraavaksi tutkimuksessa toteutettiin kokeellinen prototyyppi yhteisöllisestä mobiilipalveluympäristöstä. Kokeellista prototyyppiä hyödynnettiin sekä yhteisöllisen mobiilipalveluympäristön suorituskyvyn että uusien yhteisöllisten mobiilipalveluiden käyttäjäkokemuksen arvioinnissa. Arviointi suoritettiin aidossa käyttöympäristössä testikäyttäjien avulla. Väitöskirjatyön keskisimmät tulokset ovat seuraavat: (1) käsitteellinen analyysi arkkitehtuurillisesti erilaisten vertaisverkkojärjestelmien vahvuuksista ja heikkouksista ryhmänhallintajärjestelmän toteuttamisessa; (2) sellaisen yhteisönhallintajärjestelmän arviointi, jossa jokainen yhteisö on toteutettu erillisen ja itsenäisen rakenteellisen vertaisverkon avulla; (3) uusi yhteisöllinen mobiilipalveluympäristö, jonka keskeisin osa mobiili välikerrosohjelmisto mahdollistaa vertaisverkkoteknologioiden ja kontekstitiedon käyttämisen selaimessa toimivissa Web-sovelluksissa; (4) sellaisten uusien yhteisöllisten mobiilipalveluiden käyttäjäkokemuksen arviointi, jotka liittyvät vapaa-ajan viettopaikan valitaan musiikin perusteella ja soitettavan musiikin äänestämiseen käyttäjäyhteisöissä.

Este estudio evalúa principalmente el impacto de los costos de cambio en el poder de mercado de las firmas que ofertan los servicios de telefonía e internet móvil (Movistar, Claro, Entel y Vittel), usando datos anuales entre el 2004 y 2019. Primero, se construye el índice de Lerner una medida tradicional de poder de mercado. Para ello, se estima un precio promedio y un costo marginal para cada empresa. Adicionalmente, utilicé el método de Shy para medir los costos de cambio por cada empresa en función del precio promedio y el número de líneas. Luego, dado la disponibilidad de datos panel se aplica la especificación de Generalized Least Squares (GLS) de efectos aleatorios y el modelo de efectos fijos y aleatorios de tiempo. Encontré que los costos de cambio difieren por cada empresa. En la industria de servicios móviles del Perú se encuentra que los costos de cambio más altos corresponden a la empresa Claro y Movistar, pero que en general estos costos de cambio de las empresas se han reducido, lo que sugiere que las políticas regulatorias y la mayor competencia en la industria de servicios móviles han influenciado en su disminución. Asimismo, se encuentra que existe una relación positiva entre los costos de cambio y el poder de mercado. Es decir, las empresas que poseen mayores costos de cambio son las empresas que tienen mayor capacidad para incrementar los precios. Adicionalmente, los resultados sugieren que el poder de mercado se ve afectado por el tamaño de la empresa y el IHH. / This study mainly evaluates the impact of the costs of change on the market power of the firms that offer mobile telephony and internet services (Movistar, Claro, Entel and Vittel), using annual data between 2004 and 2019. First, the Lerner index, a traditional measure of market power, is constructed. To do this, an average price and marginal cost is estimated for each company. Additionally, I used method by Shy method to measure switching costs for each company based on the average price and the number of lines. Then, given the availability of panel data, the Generalized Least Squares (GLS) specification of random effects and the fixed and random effects time model are applied. I found that switching costs differ by company. In Peru's mobile services industry, I found that the highest switching costs are incurred by Claro and Movistar, but that in general these companies' switching costs have been reduced, suggesting that regulatory policies and increased competition in the mobile services industry have influenced their decrease. It is also found that there is a positive relationship between exchange costs and market power. That is, the companies with higher switching costs are the companies that have greater capacity to increase prices. Additionally, the results suggest that market power is affected by company size and HHI. / Trabajo de investigación

Mobile technology has evolved drastically over the years, and so has the customer’s perception of and expectations on mobile services. Mobile phones have become the essential part of customer’s life style and they expect consumer services to be available on mobile phone. In this saturated market, providing better customer experience through the channel preferred by customers is as important as selling the actual product or services. In the quest to retain existing customers as well as attracting new, companies are developing innovative mobile customer relationship management (mCRM) strategies to strike a balance between its investments and fulfilling of customers need to generate maximum profit. However, not all mCRM strategies succeed leaving customers dissatisfied and switching to competitors providing better mobile services. The purpose of this study is to understand the dynamics between the customer acceptance, customer satisfaction and customer loyalty in the context of mCRM services. Thus, answering the following research questions: a) What are the factors behind customer acceptance? b) Do mCRM services have any effect on customer loyalty? Qualitative research method were utilized to closely study two different mCRM strategies from different industries with costumer in focus. Data for the study was gathered from a costumer survey as well as from interviews with informants within the company. In addition, external data from public domain was used to validate the findings of the study. Furthermore, a research model was developed by identifying the constructs adopted from literature study of technology acceptance model (TAM3) and customer loyalty. The research model was the basis for developing the customer feedback survey. In addition, the constructs helped in identifying the impact on customer acceptance and customer loyalty for the respective mCRM strategy. This study confirms previous findings and contributes to our understanding of technology acceptance as well as customer loyalty. The study reveals that mCRM services are mostly useful to urban customers with busy and on-the-go lifestyle. Furthermore, the study shows that through well practice use behavior customer develops a habit based on the prior evaluation of perceived usefulness and perceived value. In addition, the study indicates that customers build up a new trust towards the mCRM services through the usage of the service. Finally, the results of the study indicate that the mCRM services have an impact on company’s net customer loyalty.

[pt] Este estudo propõe fazer uma análise sobre o impacto da experiência de Realidade Aumentada (RA) aplicada no varejo online utilizando dispositivo móvel. Após a revisão de literatura feita sobre este tema, foi elaborado um modelo e foram formuladas hipóteses que permitissem investigar a relação entre a Experiência de Realidade Aumentada e a Intenção de Compra, sendo esta relação mediada por avaliações do consumidor, tais como, Certeza na Escolha, Satisfação do Usuário e a Emoção Positiva. Para testar o modelo, foi feito uma pesquisa com 201 consumidores. Os dados coletados foram analisados pelo método de modelagem de equações estruturais (SEM) e confirmaram a maioria das hipóteses formuladas, apresentando relações significativas dos construtos mediadores que ficam entre a Experiência de Realidade Aumentada e a Intenção de Compra. Os resultados indicam a importância da avaliação feita pelo consumidor sobre a Certeza na Escolha ao utilizar uma Experiência de Realidade Aumentada antes da Intenção de Compra. É oportuno mencionar que o construto Emoção Positiva também é um mediador significativo entre a Experiência de Realidade Aumentada e a Intenção de Compra, porém menos forte que a Certeza na Escolha. Estes resultados sugerem que os consumidores, após uma Experiência de Realidade Aumentada, são levados a avaliar os aspectos cognitivos e afetivos antes da decisão pela compra. / [en] The purpose of this study is to analyze the impact of Augmented Reality (AR) experiences applied to online retails using a mobile device. After reviewing the literature on this topic, a model was elaborated, and hypotheses were formulated to investigate the relationship between the AR experience and the purchase intention. This relationship is mediated by consumer evaluations, such as certainty in the choice, user satisfaction, and positive emotions. To test the model, a survey was conducted with 201 consumers. The collected data were analyzed using the structural equation modeling method and confirmed most of the formulated hypotheses, presenting significant relationships between the mediating constructs with the AR experience and with the purchase intention. The results indicate the importance of the evaluation made by the consumer on the certainty of the choice when using an AR experience before the purchase intention. It is worth mentioning that the positive emotion construct is also a significant mediator between the AR experience and the purchase intention, but less strong than the certainty in the choice. These results suggest that consumers, after an AR Experience, are led to assess cognitive and affective aspects before purchase intention.

Atualmente, os usuários desejam obter, fornecer, compartilhar e interagir com informações e serviços com conteúdo multimídia em qualquer lugar, a qualquer momento e com qualquer dispositivo. Para que isso seja possível, um dos grandes desafios é assegurar a QoS (Quality of Service) fim a fim (entre o usuário final e a organização provedora de serviço) para a disponibilização de serviços móveis e interativos com conteúdo multimídia para os usuários finais. Em geral esse tipo de serviço têm maior exigência de QoS, pois além dos parâmetros de redes, possuem parâmetros específicos para áudio, imagem e vídeo, além de exigirem sincronização de áudio e vídeo, e a QoS fim a fim deve considerar parâmetros de QoS sob a percepção do usuário final. Com isso, o objetivo deste trabalho é propor um método para o levantamento de parâmetros de QoS para o estabelecimento de USLAs (User Service Level Agreements - Acordo do Nível de Serviço do Usuário) entre a organização provedora de serviço e o usuário final para serviços móveis e interativos com conteúdo multimídia em um ambiente de convergência tecnológica. O método consiste em quatro passos: 1. identificação do serviço a ser oferecido ao usuário final e elaboração de um grafo em árvore, que tem como objetivo identificar outros serviços que podem compor o serviço a ser oferecido ao usuário final; 2. mapeamento dos parâmetros de QoS em um metamodelo; 3. validação do metamodelo, para que se possa extrair do metamodelo os parâmetros de QoS; 4. elaboração do USLA. Este trabalho propõe um primeiro passo para solucionar a falta de métodos padronizados para o estabelecimento de USLA para serviços móveis e interativos com conteúdo multimídia sob a percepção do usuário final. Além de facilitar a identificação e composição de serviços e parâmetros, por meio de um metamodelo que proporciona a integração de classes de serviços que podem ser facilmente reutilizadas e customizadas, de acordo, com o tipo de serviço oferecido pela organização provedora de serviço e pela necessidade do usuário final. / In these days the final users wish to obtain, to furnish and to interact using interactive services with multimedia content anywhere, anytime and with any kind of user device. One of the biggest challenges is to assure the End-to End Quality of Service (E2E QoS) in the delivering of the interactive and multimedia services for moving users. In general, this kind of users have more strict requirements needs, because, besides of the computer network parameters, they need specify specific parameters like sound, image and video and their synchronization, on the users\' point of the view - perceived QoS. The main objective of this thesis is to present the application of a method for eliciting the E2E QoS parameters aiming the establishment of the User Service Level Agreement - USLA between the service provider and the final user applied to interactive and mobile services with multimedia content, inserted on a technological convergence environment. The method is a four steps method that consists of (1) an identification of the service to be offered to the final user and the elaboration of a tree graph aiming the identification of the composition of the service by other services (2) mapping the QoS parameters in a metamodel (3) validation of the metamodel, and extraction of the E2E QoS parameters (4) elaboration the USLA. This thesis proposes a first step to solve the lack of standardized methods for the establishment of the USLA for interactive and mobile services with multimedia content under the users\' perception. Besides of facilitating the identification and the composition of services and parameters, using a metamodel, that provides the integration of classes of services, that can be easily reused and customized, according, with the type of service offered for the service provider to the final user.

Atualmente, os usuários desejam obter, fornecer, compartilhar e interagir com informações e serviços com conteúdo multimídia em qualquer lugar, a qualquer momento e com qualquer dispositivo. Para que isso seja possível, um dos grandes desafios é assegurar a QoS (Quality of Service) fim a fim (entre o usuário final e a organização provedora de serviço) para a disponibilização de serviços móveis e interativos com conteúdo multimídia para os usuários finais. Em geral esse tipo de serviço têm maior exigência de QoS, pois além dos parâmetros de redes, possuem parâmetros específicos para áudio, imagem e vídeo, além de exigirem sincronização de áudio e vídeo, e a QoS fim a fim deve considerar parâmetros de QoS sob a percepção do usuário final. Com isso, o objetivo deste trabalho é propor um método para o levantamento de parâmetros de QoS para o estabelecimento de USLAs (User Service Level Agreements - Acordo do Nível de Serviço do Usuário) entre a organização provedora de serviço e o usuário final para serviços móveis e interativos com conteúdo multimídia em um ambiente de convergência tecnológica. O método consiste em quatro passos: 1. identificação do serviço a ser oferecido ao usuário final e elaboração de um grafo em árvore, que tem como objetivo identificar outros serviços que podem compor o serviço a ser oferecido ao usuário final; 2. mapeamento dos parâmetros de QoS em um metamodelo; 3. validação do metamodelo, para que se possa extrair do metamodelo os parâmetros de QoS; 4. elaboração do USLA. Este trabalho propõe um primeiro passo para solucionar a falta de métodos padronizados para o estabelecimento de USLA para serviços móveis e interativos com conteúdo multimídia sob a percepção do usuário final. Além de facilitar a identificação e composição de serviços e parâmetros, por meio de um metamodelo que proporciona a integração de classes de serviços que podem ser facilmente reutilizadas e customizadas, de acordo, com o tipo de serviço oferecido pela organização provedora de serviço e pela necessidade do usuário final. / In these days the final users wish to obtain, to furnish and to interact using interactive services with multimedia content anywhere, anytime and with any kind of user device. One of the biggest challenges is to assure the End-to End Quality of Service (E2E QoS) in the delivering of the interactive and multimedia services for moving users. In general, this kind of users have more strict requirements needs, because, besides of the computer network parameters, they need specify specific parameters like sound, image and video and their synchronization, on the users\' point of the view - perceived QoS. The main objective of this thesis is to present the application of a method for eliciting the E2E QoS parameters aiming the establishment of the User Service Level Agreement - USLA between the service provider and the final user applied to interactive and mobile services with multimedia content, inserted on a technological convergence environment. The method is a four steps method that consists of (1) an identification of the service to be offered to the final user and the elaboration of a tree graph aiming the identification of the composition of the service by other services (2) mapping the QoS parameters in a metamodel (3) validation of the metamodel, and extraction of the E2E QoS parameters (4) elaboration the USLA. This thesis proposes a first step to solve the lack of standardized methods for the establishment of the USLA for interactive and mobile services with multimedia content under the users\' perception. Besides of facilitating the identification and the composition of services and parameters, using a metamodel, that provides the integration of classes of services, that can be easily reused and customized, according, with the type of service offered for the service provider to the final user.

This research investigates the impact of the interaction between the consumer and mobile service provider on the adoption of advanced mobile commerce services by existing consumers of mobile technology. These factors include: 1) Perceived Relationship Quality (PRQ), which is the consumer’s evaluation of the quality of his/her relationship with the mobile service provider, and 2) Perceived Value of the Adoption Incentive (PVI), which is the consumer’s evaluation of the value of incentives that are offered by the service provider to entice him/her to adopt the mobile service. The influence of these factors on consumer attitudes and intentions towards adopting mobile commerce services is studied and compared with three other well-known adoption factors including perceived usefulness, ease of use and the subjective norm. / This study was undertaken in three parts. Firstly, a conceptual study was conducted to investigate and analyse the existing literature on consumer adoption of mobile commerce services. This phase started with a general review of the existing studies using a novel model: the Entities-Interactions Framework, EIF. The EIF explains adoption behaviour in terms of interactions between the consumer and the other entities including the mobile service, the service provider and the social system. This framework was used to analyse the extent to which important adoption factors have been covered by past research and therefore identify the research questions. The conceptual study resulted in the development of a research model and relevant hypotheses. / Secondly, a large-scale questionnaire survey was conducted to test the research model and the proposed hypotheses. This part of the research helped give a broad picture of the influence of consumer-service provider factors on consumer adoption of mobile commerce services. Thirdly, face-to-face interviews with mobile phones users were conducted in order to validate the survey results and provide an understanding of the mechanisms that control the impact of the investigated factors. The research found that PRQ and PVI have an important influence on the attitude and intention of existing mobile phone users towards accepting and using advanced mobile commerce services. Furthermore, the research found that these newly introduced factors are more influential on consumer adoption perceptions than other well-established factors. / The study enriches our understanding of technology adoption by individuals because it explains why an existing user of a technology, such as mobile technology, will or will not adopt advanced versions of that technology. The findings affirm that in the context of communication technologies, which are interactive by nature, understanding the interaction between consumers and service providers is a key to understanding the progressive adoption by consumers of advanced forms of these technologies. The thesis provides practitioners (particularly mobile service providers) with a better understanding of the impact and implication of their interaction with consumers on consumers’ acceptance and use of mobile services. The study emphasises the importance of incorporating this understanding throughout the mobile service provision process, starting from the conceptualisation of the service to the actual provision of the service to the market. The study also offers a novel comprehension of how to view each mobile service offer as a consequence of the previous offer and a precedent of the next in order to enhance consumer adoption of mobile service in the short and long runs.

Avec l'émergence de nouvelles technologies telles que le NFC (Communication à champ proche) et l'accroissement du nombre de plates-formes mobiles, les téléphones mobiles vont devenir de plus en plus indispensables dans notre vie quotidienne. Ce contexte introduit de nouveaux défis en termes de sécurité et de respect de la vie privée. Dans cette thèse, nous nous focalisons sur les problématiques liées au respect de la vie privée dans les services NFC ainsi qu’à la protection des données privées et secrets des applications mobiles dans les environnements d'exécution de confiance (TEE). Nous fournissons deux solutions pour le transport public: une solution utilisant des cartes d'abonnement (m-pass) et une autre à base de tickets électroniques (m-ticketing). Nos solutions préservent la vie privée des utilisateurs tout en respectant les exigences fonctionnelles établies par les opérateurs de transport. À cette fin, nous proposons de nouvelles variantes de signatures de groupe ainsi que la première preuve pratique d’appartenance à un ensemble, à apport nul de connaissance, et qui ne nécessite pas de calculs de couplages du côté du prouveur. Ces améliorations permettent de réduire considérablement le temps d'exécution de ces schémas lorsqu’ils sont implémentés dans des environnements contraints par exemple sur carte à puce. Nous avons développé les protocoles de m-passe et de m-ticketing dans une carte SIM standard : la validation d'un ticket ou d'un m-pass s'effectue en moins de 300ms et ce tout en utilisant des tailles de clés adéquates. Nos solutions fonctionnent également lorsque le mobile est éteint ou lorsque sa batterie est déchargée. Si les applications s'exécutent dans un TEE, nous introduisons un nouveau protocole de migration de données privées, d'un TEE à un autre, qui assure la confidentialité et l'intégrité de ces données. Notre protocole est fondé sur l’utilisation d’un schéma de proxy de rechiffrement ainsi que sur un nouveau modèle d’architecture du TEE. Enfin, nous prouvons formellement la sécurité de nos protocoles soit dans le modèle calculatoire pour les protocoles de m-pass et de ticketing soit dans le modèle symbolique pour le protocole de migration de données entre TEE. / The increasing number of worldwide mobile platforms and the emergence of new technologies such as the NFC (Near Field Communication) lead to a growing tendency to build a user's life depending on mobile phones. This context brings also new security and privacy challenges. In this thesis, we pay further attention to privacy issues in NFC services as well as the security of the mobile applications private data and credentials namely in Trusted Execution Environments (TEE). We first provide two solutions for public transport use case: an m-pass (transport subscription card) and a m-ticketing validation protocols. Our solutions ensure users' privacy while respecting functional requirements of transport operators. To this end, we propose new variants of group signatures and the first practical set-membership proof that do not require pairing computations at the prover's side. These novelties significantly reduce the execution time of such schemes when implemented in resource constrained environments. We implemented the m-pass and m-ticketing protocols in a standard SIM card: the validation phase occurs in less than 300ms whilst using strong security parameters. Our solutions also work even when the mobile is switched off or the battery is flat. When these applications are implemented in TEE, we introduce a new TEE migration protocol that ensures the privacy and integrity of the TEE credentials and user's private data. We construct our protocol based on a proxy re-encryption scheme and a new TEE model. Finally, we formally prove the security of our protocols using either game-based experiments in the random oracle model or automated model checker of security protocols.