| 1. |
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| 2. |
- Angulo, Julio, 1980-
(författare)
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Designing for Usable Privacy and Transparency in Digital Transactions
- 2015
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- People engage with multiple online services and carry out a range of different digital transactions with these services. Registering an account, sharing content in social networks, or requesting products or services online are a few examples of such digital transactions. With every transaction, people take decisions and make disclosures of personal data. Despite the possible benefits of collecting data about a person or a group of people, massive collection and aggregation of personal data carries a series of privacy and security implications which can ultimately result in a threat to people's dignity, their finances, and many other aspects of their lives. For this reason, privacy and transparency enhancing technologies are being developed to help people protect their privacy and personal data online. However, some of these technologies are usually hard to understand, difficult to use, and get in the way of people's momentary goals.The objective of this thesis is to explore, and iteratively improve, the usability and user experience provided by novel privacy and transparency technologies. To this end, it compiles a series of case studies that address identified issues of usable privacy and transparency at four stages of a digital transaction, namely the information, agreement, fulfilment and after-sales stages. These studies contribute with a better understanding of the human-factors and design requirements that are necessary for creating user-friendly tools that can help people to protect their privacy and to control their personal information on the Internet.
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| 3. |
- Angulo, Julio, 1980-, et al.
(författare)
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Exploring Touch-Screen Biometrics for User Identification on Smart Phones
- 2011
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Ingår i: Privacy and Identity Managementfor Life. - Berlin, Heidelberg : Springer. - 9783642316678 - 9783642316685 ; , s. 130-143
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Konferensbidrag (refereegranskat)abstract
- The use of mobile smart devices for storing sensitive informationand accessing online services is increasing. At the same time, methods for authenticating users into their devices and online services that are not only secure, but also privacy and user-friendly are needed. In this paper, we present our initial explorations of the use of lock pattern dynamics as a secure and user-friendly two-factor authentication method. We developed an application for the Android mobile platform to collect data on the way individuals draw lock patterns on a touchscreen. Using a Random Forest machine learning classier this method achieves an average Equal Error Rate (EER) of approximately 10.39%, meaning that lock patterns biometrics can be used for identifying users towards their device, but could also pose a threat to privacy if the users' biometric information is handled outside their control.
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| 4. |
- Angulo, Julio, 1980-, et al.
(författare)
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HCI for Policy Display and Administration
- 2011. - 1
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Ingår i: Privacy and Identity Management for Life. - Berlin : Springer Berlin/Heidelberg. - 9783642203176 ; , s. 261-277
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Bokkapitel (refereegranskat)abstract
- The PrimeLife Policy Language (PPL) has the objective of helping end users make the data handling practices of data controllers more transparent, allowing them to make well-informed decisions about the release of personal data in exchange for services. In this chapter, we present our work on user interfaces for the PPL policy engine, which aims at displaying the core elements of a data controller's privacy policy in an easily understandable way as well as displaying how far it corresponds with the user's privacy preferences. We also show how privacy preference management can be simplified for end users.
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| 5. |
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| 6. |
- Angulo, Julio, 1980-, et al.
(författare)
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Identity Management through “Profiles” : Prototyping an Online Information Segregation Service
- 2013
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Ingår i: Human-Computer Interaction. Users and Contexts of Use. - Berlin, Heidelberg : Springer Berlin/Heidelberg. - 9783642392641 - 9783642392658 ; , s. 10-19
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Konferensbidrag (refereegranskat)abstract
- Whereas in real everyday life individuals have an intuitive approach at deciding which information to disseminate to others, in the digital world it becomes difficult to keep control over the information that is distributed to different online services. In this paper we present the design of a user interface for a system that can help users decide which pieces of information to distribute to which type of service providers by allowing them to segregate their information attributes into various personalized profiles. Iterative usability evaluations showed that users understand and appreciate the possibility to segregate information, and revealed possible improvements, implications and limitations of such an interface.
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| 7. |
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| 8. |
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| 9. |
- Angulo, Julio, 1980-, et al.
(författare)
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Towards Usable Privacy Policy Display & Management
- 2012
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Ingår i: Information Management & Computer Security. - Bingley, UK : Emerald Group Publishing Limited. - 0968-5227. ; 20, s. 4-17
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Tidskriftsartikel (refereegranskat)abstract
- This paper discusses the approach taken within the PrimeLife project for providing user-friendly privacy policy interfaces for the PrimeLife Policy Language (PPL).We present the requirements, design process and usability testing of the “Send Data?” prototype, a browser extension designed and developed to deal with the powerful features provided by PPL. Our interface introduces the novel features of “on the fly” privacy management, predefined levels of privacy settings, and simplified selectionof anonymous credentials. Results from usability tests showed that users understand and appreciate these features and perceive them as being privacy-friendly, and they are therefore suggested as a good approach towards usable privacy policy display and management. Additionally, we present our lessons learnt in the design process of privacy policy interfaces.
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| 10. |
- Angulo, Julio, 1980-, et al.
(författare)
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Understanding the user experience of secure mobile online transactions in realistic contexts of use
- 2012
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Ingår i: Symposium on Usable Privacy and Security (SOUPS) 2012. - Washington D.C.,USA : Association for Computing Machinery (ACM). ; , s. 8-
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Konferensbidrag (refereegranskat)abstract
- Possible attacks on mobile smart devices demand higher security for applications handling payments or sensitive information. The introduction of a tamper-proof area on future generations of mobile devices, called Trusted Execution Environment (TEE), is being implemented. Before devices with embedded TEEs can be deployed to the public, investigations on usability aspects of Trusted User Interfaces (TUI) are needed. This article describes the process we have followed at gathering requirements, prototyping and testing suitable designs for TUIs in combination with a touch-screen biometric system. At the end, we present relevant findings of a pilot study that we have conducted using an Experience Sampling Method (ESM) as part of our ongoing work.
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| 11. |
- Angulo, Julio, 1980-
(författare)
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Usable privacy for digital transactions : Exploring the usability aspects of three privacy enhancing mechanisms
- 2012
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The amount of personal identifiable information that people distribute over different online services has grown rapidly and considerably over the last decades. This has led to increased probabilities for identity theft, profiling and linkability attacks, which can in turn not only result in a threat to people’s personal dignity, finances, and many other aspects of their lives, but also to societies in general. Methods and tools for securing people’s online activities and protecting their privacy on the Internet, so called Privacy Enhancing Technologies (PETs), are being designed and developed. However, these technologies are often seen by ordinary users as complicated and disruptive of their primary tasks. In this licentiate thesis, I investigate the usability aspects of three main privacy and security enhancing mechanisms. These mechanisms have the goal of helping and encouraging users to protect their privacy on the Internet as they engage in some of the steps necessary to complete a digital transaction. The three mechanisms, which have been investigated within the scope of different research projects, comprise of (1) graphical visualizations of service providers’ privacy policies and user-friendly management and matching of users’ privacy preferences “on the fly”, (2) methods for helping users create appropriate mental models of the data minimization property of anonymous credentials, and (3) employing touch-screen biometrics as a method to authenticate users into mobile devices and verify their identities during a digital transaction. Results from these investigations suggest that these mechanisms can make digital transactions privacy-friendly and secure while at the same time delivering convenience and usability for ordinary users.
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| 12. |
- Angulo, Julio, 1980-
(författare)
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Usable Transparency through network representations and analyses
- 2015
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Ingår i: The Future of Networked Privacy.
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Konferensbidrag (refereegranskat)abstract
- We explore how concepts from the field of network science can be employed to inform Internet users about the way their personal identifiable information (PII) is being used and shared by online services. We argue that presenting users with graphical interfaces that display information about the network structures that are formed by PII exchanges can have an impact on the decisions users take online, such as the services they choose to interact with and the information they decide release.
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| 13. |
- Angulo, Julio, 1980-, et al.
(författare)
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Usable Transparency with the Data Track : A Tool for Visualizing Data Disclosures
- 2015
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Ingår i: CHI EA '15 Proceedings of the 33rd Annual ACM Conference Extended Abstracts on Human Factors in Computing Systems. - New York, NY, USA : Association for Computing Machinery (ACM). - 9781450331463 ; , s. 1803-18098
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Konferensbidrag (refereegranskat)abstract
- We present a prototype of the user interface of a transparency tool that displays an overview of a user's data disclosures to different online service providers and allows them to access data collected about them stored at the services' sides. We explore one particular type of visualization method consisting of tracing lines that connect a user's disclosed personal attributes to the service to which these attributes have been disclosed. We report on the ongoing iterative process of design of such visualization, the challenges encountered and the possibilities for future improvements.
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| 14. |
- Angulo, Julio, 1980-
(författare)
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Users as Prosumers of PETs : The Challenge of Involving Users in the Creation of Privacy Enhancing Technologies
- 2013
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Ingår i: Frameworks of IT Prosumption for Business Development. - : IGI Global. - 9781466643130 ; , s. 178-199
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Bokkapitel (refereegranskat)abstract
- Frequent contact with online businesses requires Internet users to distribute large amounts of personal information. This spreading of users’ information through different Websites can eventually lead to increased probabilities for identity theft, profiling and linkability attacks, as well as other harmful consequences. Methods and tools for securing people’s online activities and protecting their privacy on the Internet, called Privacy Enhancing Technologies (PETs), are being designed and developed. However, these technologies are often perceived as complicated and obtrusive by users who are not privacy aware or are not computer or technology savvy. This chapter explores the way in which users’ involvement has been considered during the development process of PETs and argues that more democratic approaches of user involvement and data handling practices are needed. It advocates towards an approach in which people are not only seen as consumers of privacy and security technologies, but where they can play a role as the producers of ideas and sources of inspiration for the development of usable PETs that meet their actual privacy needs and concerns.
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| 15. |
- Angulo, Julio, 1980-, et al.
(författare)
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What Would It Take for You to Tell Your Secrets to a Cloud? : Studying decision factors when disclosing information to cloud services
- 2014
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Ingår i: Secure IT Systems. - Cham : Springer. - 9783319115993 ; , s. 129-145
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Konferensbidrag (refereegranskat)abstract
- We investigate the end users’ behaviours and attitudes with regards to the control they place in the personal information that they disclose to cloud storage services. Three controlled experiments were carried out to study the influence in users’ decisions to retain or surrender control over their personal information depending on different factors. The results of these experiments reveal, among other things, the users’ willingness to surrender control over personal information that is perceived as non-sensitive in exchange for valuable rewards, and that users would value the possibility of knowing and controlling the parties who are granted access to their data in the cloud. Based on the results from the experiments we provide implications for the design of end-user tools that can promote transparency and accountability in cloud computing environments.
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| 16. |
- Angulo, Julio, 1980-, et al.
(författare)
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“WTH..!?!” Experiences, reactions, and expectations related to online privacy panic situations
- 2019
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Ingår i: SOUPS 2015. - : USENIX - The Advanced Computing Systems Association. - 9781931971249 ; , s. 19-38
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Konferensbidrag (refereegranskat)abstract
- There are moments in which users might find themselves experiencing feelings of panic with the realization that their privacy or personal information on the Internet might be at risk. We present an exploratory study on common experiences of online privacy-related panic and on users' reactions to frequently occurring privacy incidents. By using the metaphor of a privacy panic button, we also gather users' expectations on the type of help that they would like to obtain in such situations. Through user interviews (n = 16) and a survey (n = 549), we identify 18 scenarios of privacy panic situations. We ranked these scenarios according to their frequency of occurrence and to the concerns of users to become victims of these incidents. We explore users' underlying worries of falling pray for these incidents and other contextual factors common to privacy panic experiences. Based on our findings we present implications for the design of a help system for users experiencing privacy panic situations.
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| 17. |
- Fernández Gago, M. Carmen, et al.
(författare)
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Tools for Cloud Accountability : A4Cloud Tutorial
- 2015
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Ingår i: Privacy and Identity Management for the Future Internet in the Age of Globalisation. - Cham : Springer. - 9783319186207 ; , s. 219-236
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Bokkapitel (refereegranskat)abstract
- Cloud computing is becoming a key IT infrastructure technology being adopted progressively by companies and users. Still, there are issues and uncertainties surrounding its adoption, such as security and how users data is dealt with that require attention from developers, researchers, providers and users. The A4Cloud project tries to help solving the problem of accountability in the cloud by providing tools that support the process of achieving accountability. This paper presents the contents of the first A4Cloud tutorial. These contents include basic concepts and tools developed within the project. In particular, we will review how metrics can aid the accountability process and some of the tools that the A4Cloud project will produce such as the Data Track Tool (DTT) and the Cloud Offering Advisory Tool (COAT).
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| 18. |
- Fischer-Hübner, Simone, 1963-, et al.
(författare)
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HCI requirements for Transparency and Accountability Tools for Cloud Service Chains
- 2015
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Ingår i: Accountability and Security for the Cloud. - Cham : Springer. - 9783319171982 - 9783319171999 ; , s. 81-113
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Bokkapitel (refereegranskat)abstract
- This paper elaborates HCI (Human-Computer Interaction) requirementsfor making cloud data protection tools comprehensible and trustworthy.The requirements and corresponding user interface design principles are derivedfrom our research and review work conducted to address in particular the followingHCI challenges: How can the users be guided to better comprehend theflow and traces of data on the Internet and in the cloud? How can individual endusers be supported to do better informed decisions on how their data can be usedby cloud providers or others? How can the legal privacy principle of transparencyand accountability be enforced by the user interfaces of cloud inspectiontools? How can the user interfaces help users to reassess their trust/distrust inservices? The research methods that we have used comprise stakeholderworkshops, focus groups, controlled experiments, usability tests as well as literatureand law reviews. The derived requirements and principles are groupedinto the following functional categories: (1) ex-ante transparency, (2) exercisingdata subject rights, (3) obtaining consent, (4) privacy preference management,(5) privacy policy management, (6) ex-post transparency, (7) audit configuration,(8) access control management, and (9) privacy risk assessment. This broadcategorization makes our results accessible and applicable for any developerwithin the field of usable privacy and transparency-enhancing technologies forcloud service chains.
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| 19. |
- Fischer-Hübner, Simone, 1963-, et al.
(författare)
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How can Cloud Users be Supported in Deciding on, Tracking and Controlling How their Data are Used?
- 2014
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Ingår i: Privacy and Identity Management for Emerging Services and Technologies. - : Springer. - 9783642551376 - 9783642551369 ; , s. 77-92
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Konferensbidrag (refereegranskat)abstract
- Transparency is a basic privacy principle and factor of social trust. However, the processing of personal data along a cloud chain is often rather intransparent to the data subjects concerned. Transparency Enhancing Tools (TETs) can help users in deciding on, tracking and controlling their data in the cloud. However, TETs for enhancing privacy also have to be designed to be both privacy-preserving and usable. In this paper, we provide requirements for usable TETs for the cloud. The requirements presented in this paper were derived in two ways; at a stakeholder workshop and through a legal analysis. Here we discuss design principles for usable privacy policies and give examples of TETs which enable end users to track their personal data. We are developing them using both privacy and usability as design criteria.
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| 20. |
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| 21. |
- Fleury, Vanessa, et al.
(författare)
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Embarrassment and Shame in People With Parkinson's Disease : A New Tool for Self-Assessment
- 2020
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Ingår i: Frontiers in Neurology. - : Frontiers Media S.A.. - 1664-2295. ; 11
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Tidskriftsartikel (refereegranskat)abstract
- Shame and embarrassment related to Parkinson's disease (PD) are rarely addressed in clinical practice nor studied in neuroscience research, partly because no specific tool exists to detect them in PD.Objective:To develop a self-applied assessment tool of shame and embarrassment specifically related to PD or its treatment, to promptly identify the presence and severity of these two emotions in PD.Methods: Identification and selection of relevant items were obtained from the collection of PD patients' opinions during support groups and interviews. Several further items were added following a literature review. Subsequently, a two-phase pilot study was performed for identification of ambiguous items and omissions, and to obtain preliminary data on acceptability, reliability, validity and relevance of the new scale (SPARK).Results: A total of 105 PD patients were enrolled in the study. Embarrassment was reported in 85% of patients, while shame was present in 26%. Fifteen percent of patients did not describe any shame or embarrassment. On average, the intensity of these two emotions was low with a marked floor effect in SPARK items and subscales. However, SPARK total score inter-individual variability was important (range 1-84 out of 99). Acceptability and quality of data were satisfactory with no floor or ceiling effects (2.9% each) or missing data. Internal consistency (Cronbach's alpha) was 0.94 for total score and 0.73-0.87 for subscales. The scale correlated >= 0.60 with instruments measuring related constructs. Content validity was satisfactory. SPARK total score strongly correlated with impaired health-related quality of life (r(S)= 0.81), the propensity to feel embarrassed or ashamed (r(S)= 0.68 and 0.66, respectively), and anxiety (r(S)= 0.72) and depression (r(S)= 0.63) levels. Moderate to high correlations were observed between SPARK total score and apathy (r(S)= 0.46) and a more pronounced personality trait directed toward harm avoidance (r(S)= 0.46). No significant differences in SPARK scores were found by sex, education level, PD duration, Hoehn and Yahr stages or PD phenotype.Conclusion: Preliminary analysis of psychometric properties suggests that SPARK could be an acceptable and reliable instrument for assessing shame and embarrassment in PD. SPARK could help healthcare professionals to identify and characterize PD-induced shame and embarrassment.
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| 22. |
- Gilje Jaatun, Martin, et al.
(författare)
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Accountability Through Transparency for Cloud Customers
- 2016. - 1
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Ingår i: CLOUD COMPUTING AND SERVICES SCIENCE, CLOSER 2015. - Heidelberg : Springer. - 9783319295817 ; , s. 38-57
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Konferensbidrag (refereegranskat)abstract
- Public cloud providers process data on behalf of their customers in data centres that typically are physically remote from their users. This context creates a number of challenges related to data privacy and security, and may hinder the adoption of cloud technology. One of these challenges is how to maintain transparency of the processes and procedures while at the same time providing services that are secure and cost effective. This chapter presents results from an empirical study in which the cloud customers identified a number of transparency requirements to the adoption of cloud providers. We have compared our results with previous studies, and have found that in general, customers are in synchrony with research criteria for cloud service provider transparency, but there are also some extra pieces of information that customers are looking for. We further explain how A4Cloud tools contribute to addressing the customers’ requirements.
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| 23. |
- Householder, John Ethan, et al.
(författare)
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One sixth of Amazonian tree diversity is dependent on river floodplains
- 2024
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Ingår i: NATURE ECOLOGY & EVOLUTION. - 2397-334X.
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Tidskriftsartikel (refereegranskat)abstract
- Amazonia's floodplain system is the largest and most biodiverse on Earth. Although forests are crucial to the ecological integrity of floodplains, our understanding of their species composition and how this may differ from surrounding forest types is still far too limited, particularly as changing inundation regimes begin to reshape floodplain tree communities and the critical ecosystem functions they underpin. Here we address this gap by taking a spatially explicit look at Amazonia-wide patterns of tree-species turnover and ecological specialization of the region's floodplain forests. We show that the majority of Amazonian tree species can inhabit floodplains, and about a sixth of Amazonian tree diversity is ecologically specialized on floodplains. The degree of specialization in floodplain communities is driven by regional flood patterns, with the most compositionally differentiated floodplain forests located centrally within the fluvial network and contingent on the most extraordinary flood magnitudes regionally. Our results provide a spatially explicit view of ecological specialization of floodplain forest communities and expose the need for whole-basin hydrological integrity to protect the Amazon's tree diversity and its function.
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| 24. |
- Luize, Bruno Garcia, et al.
(författare)
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Geography and ecology shape the phylogenetic composition of Amazonian tree communities
- 2024
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Ingår i: JOURNAL OF BIOGEOGRAPHY. - 0305-0270 .- 1365-2699.
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Tidskriftsartikel (refereegranskat)abstract
- Aim: Amazonia hosts more tree species from numerous evolutionary lineages, both young and ancient, than any other biogeographic region. Previous studies have shown that tree lineages colonized multiple edaphic environments and dispersed widely across Amazonia, leading to a hypothesis, which we test, that lineages should not be strongly associated with either geographic regions or edaphic forest types. Location: Amazonia. Taxon: Angiosperms (Magnoliids; Monocots; Eudicots). Methods: Data for the abundance of 5082 tree species in 1989 plots were combined with a mega-phylogeny. We applied evolutionary ordination to assess how phylogenetic composition varies across Amazonia. We used variation partitioning and Moran's eigenvector maps (MEM) to test and quantify the separate and joint contributions of spatial and environmental variables to explain the phylogenetic composition of plots. We tested the indicator value of lineages for geographic regions and edaphic forest types and mapped associations onto the phylogeny. Results: In the terra firme and v & aacute;rzea forest types, the phylogenetic composition varies by geographic region, but the igap & oacute; and white-sand forest types retain a unique evolutionary signature regardless of region. Overall, we find that soil chemistry, climate and topography explain 24% of the variation in phylogenetic composition, with 79% of that variation being spatially structured (R-2 = 19% overall for combined spatial/environmental effects). The phylogenetic composition also shows substantial spatial patterns not related to the environmental variables we quantified (R-2 = 28%). A greater number of lineages were significant indicators of geographic regions than forest types. Main Conclusion: Numerous tree lineages, including some ancient ones (>66 Ma), show strong associations with geographic regions and edaphic forest types of Amazonia. This shows that specialization in specific edaphic environments has played a long-standing role in the evolutionary assembly of Amazonian forests. Furthermore, many lineages, even those that have dispersed across Amazonia, dominate within a specific region, likely because of phylogenetically conserved niches for environmental conditions that are prevalent within regions.
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| 25. |
- ter Steege, Hans, et al.
(författare)
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Mapping density, diversity and species-richness of the Amazon tree flora
- 2023
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Ingår i: COMMUNICATIONS BIOLOGY. - 2399-3642. ; 6:1
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Tidskriftsartikel (refereegranskat)abstract
- Using 2.046 botanically-inventoried tree plots across the largest tropical forest on Earth, we mapped tree species-diversity and tree species-richness at 0.1-degree resolution, and investigated drivers for diversity and richness. Using only location, stratified by forest type, as predictor, our spatial model, to the best of our knowledge, provides the most accurate map of tree diversity in Amazonia to date, explaining approximately 70% of the tree diversity and species-richness. Large soil-forest combinations determine a significant percentage of the variation in tree species-richness and tree alpha-diversity in Amazonian forest-plots. We suggest that the size and fragmentation of these systems drive their large-scale diversity patterns and hence local diversity. A model not using location but cumulative water deficit, tree density, and temperature seasonality explains 47% of the tree species-richness in the terra-firme forest in Amazonia. Over large areas across Amazonia, residuals of this relationship are small and poorly spatially structured, suggesting that much of the residual variation may be local. The Guyana Shield area has consistently negative residuals, showing that this area has lower tree species-richness than expected by our models. We provide extensive plot meta-data, including tree density, tree alpha-diversity and tree species-richness results and gridded maps at 0.1-degree resolution. A study mapping the tree species richness in Amazonian forests shows that soil type exerts a strong effect on species richness, probably caused by the areas of these forest types. Cumulative water deficit, tree density and temperature seasonality affect species richness at a regional scale.
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| 26. |
- Vicente‑Serrano, Sergio M., et al.
(författare)
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Influence of the interannual variability of meteorological drought on the cross-interactions of ecological and hydrological drought in the central Spanish Pyrenees
- 2023
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Ingår i: GeoFocus. - 1578-5157. ; 31, s. 55-85
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Tidskriftsartikel (refereegranskat)abstract
- This paper analyzes the influence of the interannual variability of climatic drought on ecological and hydrological droughts for a basin in the central Spanish Pyrenees using variables derived from observations and hydro-ecological simulation in order to determine the possible connection between meteorological, ecological and hydrological drought considering a cascading approach and encompassing different variables that give insights into water availability in the basin (e.g., soil moisture, streamflow, reservoir storages and releases). Using different climatic, ecological and hydrological standardized drought indices, we show the greater role of meteorological droughts in hydrological systems than in ecological systems, and the small influence of vegetation activity and growth in explaining the interannual variability of water resources in the basin. By contrast,hydrological droughts are strongly affected by precipitation variability with relationships characterized by seasonal differences and the role of different time-scales in the standardized drought metrics.
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| 27. |
- Wästlund, Erik, 1969-, et al.
(författare)
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Evoking Comprehensive Mental Models of Anonymous Credentials
- 2012
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Ingår i: Proceedings of the 2011 IFIP WG 11.4 international conference on Open Problems in Network Security. - Berlin : Springer Berlin/Heidelberg. - 9783642275845 ; , s. 1-14
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Konferensbidrag (refereegranskat)abstract
- Anonymous credentials are a fundamental technology for preserving end users' privacy by enforcing data minimization for online applications. However, the design of user-friendly interfaces that convey their privacy benefits to users is still a major challenge. Users are still unfamiliar with the new and rather complex concept of anonymous credentials, since no obvious real-world analogies exists that can help them create the correct mental models. In this paper we explore different ways in which suitable mental models of the data minimization property of anonymous credentials can be evoked on end users. To achieve this, we investigate three different approaches in the context of an e-shopping scenario: a card-based approach, an attribute-based approach and an adapted card-based approach. Results show that the adapted card-based approach is a good approach towards evoking the right mental models for anonymous credential applications. However, better design paradigms are still needed to make users understand that attributes can be used to satisfy conditions without revealing the value of the attributes themselves.
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| 28. |
- Wästlund, Erik, 1969-, et al.
(författare)
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Final HCI Research Report : Deliverable D4.1.5
- 2011
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Rapport (refereegranskat)abstract
- This deliverable provides an overview of recent research results of Activity 4 ‘Usability’ of PrimeLife, where an emphasis is put on those results, which have not been reported in the same detail in other HCI-related PrimeLife deliverables yet. The first part reports about our results in the area of User Interface (UI) Representation of Privacyenhancing Identity Management Concepts and presents research on PET methodologies, mental models for anonymous credentials and the results from the final round of end-user evaluations of the UI prototypes developed during the PrimeLife project. The second part reports about our work in the area of usable privacy policies and presents the final results of Activity 4’s research on policy icons and on a user-friendly management and display of PPL (PrimeLife Policy Language) policies.
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| 29. |
- Wästlund, Erik, 1969-, et al.
(författare)
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Towards Usable Privacy Enhancing Technologies : Lessons Learned from the PrimeLife Project
- 2011
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- In this deliverable, we present lessons learnt from the PrimeLife HCI (Human Computer Interaction) Activity by discussing typical HCI challenges and fallacies that we experienced during the PrimeLife project. We also provide guidance on how these issues can be addressed in order to develop usable privacy-enhancing technology solutions.
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