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A Privacy-Aware and Secure System for Human Memory Augmentation

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A Privacy-Aware and Secure System for Human Memory Augmentation A Privacy-aware and Secure System for Human Memory Augmentation Doctoral Dissertation submitted to the Faculty of Informatics of the Università della Svizzera italiana in partial fulfillment of the requirements for the degree of Doctor of Philosophy presented by Agon Bexheti under the supervision of Prof. Marc Langheinrich September 2019 Dissertation Committee Prof. Antonio Carzaniga Università della Svizzera italiana, Switzerland Prof. Fernando Pedone Università della Svizzera italiana, Switzerland Prof. Cecilia Mascolo University of Cambridge, United Kingdom Prof. Claudio Bettini Università degli Studi di Milano, Italy Dissertation accepted on 06 September 2019 Research Advisor PhD Program Director Prof. Marc Langheinrich Prof. Walter Binder and Prof. Silvia Santini i I certify that except where due acknowledgement has been given, the work presented in this thesis is that of the author alone; the work has not been submit- ted previously, in whole or in part, to qualify for any other academic award; and the content of the thesis is the result of work which has been carried out since the official commencement date of the approved research program. Agon Bexheti Lugano, 06 September 2019 ii Abstract The ubiquity of digital sensors embedded in today’s mobile and wearable devices (e.g., smartphones, wearable cameras, wristbands) has made technology more intertwined with our life. Among many other things, this allows us to seamlessly log our daily experiences in increasing numbers and quality, a process known as “lifelogging”. This practice produces a great amount of pictures and videos that can potentially improve human memory. Consider how a single photograph can bring back distant childhood memories, or how a song can help us reminisce about our last vacation. Such a vision of a “memory augmentation system” can offer considerable ben- efits, but it also raises new security and privacy challenges. Maybe obviously, a system that captures everywhere we go, and everything we say, see, and do, is greatly increasing the danger to our privacy. Any data breach of such a memory repository, whether accidental or malicious, could negatively impact both our professional and private reputation. In addition, the threat of memory manipu- lation might be the most worrisome aspect of a memory augmentation system: if an attacker is able to remove, add, or change our captured information, the re- sulting data may implant memories in our heads that never took place, or, in turn, accelerate the loss of other memories. Starting from such key challenges, this thesis investigates how to design secure memory augmentation systems. In the course of this research, we develop tools and prototypes that can be applied by researchers and system engineers to de- velop pervasive applications that help users capture and later recall episodic memories in a secure fashion. We build trusted sensors and protocols to se- curely capture and store experience data, and secure software for the secure and privacy-aware exchange of experience data with others. We explore the suitabil- ity of various access control models to put users in control of the plethora of data that the system captures on their behalf. We also explore the possibility of using in situ physical gestures to control different aspects regarding the capturing and sharing of experience data. Ultimately, this thesis contributes to the design and development of secure systems for memory augmentation. iii iv Abstract Acknowledgements I acknowledge the financial support of the Future and Emerging Technologies (FET) programme within the 7th Framework Programme for Research of the European Commission, under FET Grant Number: 612933 (RECALL). v vi Acknowledgements Contents Contents vii List of Figures xi List of Tables xiii I Introduction and Background 1 1 Introduction 3 1.1 Vision: Pervasive Memory Augmentation . .5 1.1.1 Memory Cue Sources . .7 1.1.2 Cue Presentation . .9 1.1.3 Sample Scenarios . .9 1.2 Research Questions . 11 1.3 Research Context: The RECALL Project . 13 1.4 Thesis Goals . 13 1.5 Methodology . 14 1.5.1 Design of Security Mechanisms . 15 1.5.2 Benchmarking and Performance Evaluation . 17 1.5.3 Design of a Memory Control Interface . 18 1.6 Thesis Outline . 19 1.7 Publication Overview . 21 2 Background 25 2.1 Pervasive and Context-aware Computing . 25 2.2 Lifelogging . 27 2.2.1 Lifelogs as a Surrogate Memory . 28 2.2.2 Lifelogging Devices . 30 2.2.3 Extracting Useful Information from Lifelogs . 35 vii viii Contents 2.2.4 Legal and Ethical Issues . 39 2.3 Human Memory . 46 2.3.1 Human Memory Manipulation . 49 2.4 The Envisioned Threat Model . 50 II Manipulation Resistant Memory Capture and Sharing 53 3 Secure Memory Capture and Storage 55 3.1 Threat Model and Requirements . 57 3.2 Related Work . 59 3.3 Secure Memory Capture Using Trusted Sensors . 61 3.3.1 Camera Implementation . 62 3.3.2 Trusting the Camera . 62 3.3.3 Provisioning and Protecting Camera Key Material . 65 3.4 A Storage Protocol for Securely Linking Data . 65 3.4.1 Protocol Description . 66 3.4.2 Checking for Missing Images . 69 3.4.3 Generating the MAC token key TK . 69 3.4.4 Security Analysis . 70 3.4.5 Evaluation . 72 3.5 Limitations . 73 3.6 Chapter Summary . 74 4 Secure Memory Sharing 77 4.1 Threat Model and Requirements . 79 4.2 Related Work . 81 4.3 A Systematic Approach for Memory Sharing . 84 4.3.1 System Requirements . 84 4.3.2 System Description . 85 4.4 Verifying Shared but Modified Image Cues . 91 4.4.1 Variant 1: A Practical Protocol Based on Hash Schemes . 92 4.4.2 Variant 2: A Protocol Based on Homomorphic Encryption . 95 4.5 Implementation . 101 4.6 Security Analysis . 102 4.6.1 Experience Sharing System . 103 4.6.2 Image Verification Protocol . 104 4.7 Evaluation . 105 4.7.1 Beacon Reception Rates and Proximity Range . 106 Contents ix 4.7.2 Runtime Overhead and Energy Consumption . 108 4.8 Chapter Summary . 110 III Memory Capture and Access Control 113 5 A Tangible Interface for Controlling Memory Capture and Sharing 115 5.1 Related Work . 116 5.2 MemStone Interface . 119 5.2.1 Design Principles . 119 5.2.2 Interface Description . 121 5.2.3 Gestures and Control Actions . 122 5.2.4 Envisioned Usage Scenario . 123 5.2.5 Using MemStone to Control Infrastructure Sensors . 125 5.3 Phone-app as an Alternative Interface . 126 5.4 User Study . 127 5.4.1 Study Design and Procedure . 127 5.4.2 Recorded Meetings and Tasks . 129 5.5 Results: Interface Comparison . 130 5.5.1 Efficiency and Effectiveness . 130 5.5.2 Perceived Usability and Learnability . 132 5.5.3 Perceived Intuitiveness and Enjoyment . 133 5.6 Results: Long-term Gesture Memorability . 134 5.6.1 Follow-up Study . 135 5.6.2 Results . 136 5.7 User Perceptions of the MemStone Device . 138 5.7.1 Suggested Design Improvements . 138 5.7.2 Interaction Techniques . 139 5.7.3 Role of Device Visibility . 139 5.8 Discussion . 140 5.9 Chapter Summary . 144 6 Access Control for Memory Augmentation Systems 147 6.1 Control Requirements . 149 6.1.1 Controlling Experience Capture . 149 6.1.2 Memory Access Control . 151 6.2 Evaluation of Access Control Models . 153 6.2.1 Support for context-based capture and sharing . 153 6.2.2 Support for sharing based on interpersonal relations . 155 x Contents 6.2.3 Support for multi-user governance . 156 6.2.4 Data obfuscation and sharing granularity . 157 6.3 Evaluation Summary . 161 6.4 Research Challenges . 164 6.5 Chapter Summary . 166 IV Conclusion and Future Work 169 7 Conclusion and Future Work 171 7.1 Summary of Contributions and Results . 173 7.1.1 Securely Capturing and Storing of Experience Data . 173 7.1.2 Secure Memory Sharing with Co-located Others . 174 7.1.3 Verifying Shared but Modified Visual Cues . 174 7.1.4 In-situ Controls for Memory Capture and Sharing . 175 7.1.5 A Review of the Suitability of Access Control Models for Memory Augmentation Systems . 176 7.2 Future Work . 176 7.2.1 Additional Memory Manipulation Threats . 176 7.2.2 Verifying More Image Modifications Beyond Blurring . 178 7.2.3 Specifying Control Policies Through Abstractions . 178 Bibliography 181 Figures 1.1 Three steps memory augmentation process. .6 1.2 Prototypes of ambient displays for cue presentation. .8 1.3 Security design process. 15 2.1 Commercial lifelogging devices. 30 2.2 Experience capturing with wearable and fixed cameras. 33 3.1 Threat model for captured experience data. 57 3.2 System overview for secure capture and storage. 61 3.3 Our prototypical camera setup used for performance evaluation. 63 3.4 Overview of the file chain scheme. 66 3.5 Pseudocode of the storage protocol. 68 3.6 Camera runtime overhead. 73 4.1 Threat model when exchanging data among co-located peers. 80 4.2 Capturing and sharing lifelog data between co-located peers. 86 4.3 State diagram of the memory cue sharing process. 89 4.4 Pseudocode of the image verification protocol (variant 1). 94 4.5 The process of “blinding” a region of an image before sharing it. 95 4.6 Pseudocode of the image verification protocol (variant 2). 98 4.7 The beacon protocol data unit. 102 4.8 Attack tree for unauthorized access to peers’ captured data. 103 4.9 Beacon reception rates for three token-pubkey ratios. 106 4.10 Runtime overhead of Protocol 2. 108 4.11 Camera estimated operational time on a single battery charge. ..
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