Dissertations/Theses
Browse
Item New ICT solution for providing health care services to beggars of Bangladesh(Department of Computer Science and Engineering (CSE), BUET, 2019-09-28) Aminur Rahman, Md.; A. B. M. Alim Al Islam, Dr.Beggars are deprived of all the fundamental human rights, including healthcare support that often engenders consequences minor to severe, if not lethal, to this people. Bangladesh, having a significant number of beggars living mostly in its capital Dhaka, is no difference. However, one prominent difference observed for these beggars compared to similar people in other parts in the world (for example homeless people in the USA) is that technology penetration is near to zero for the beggars in Bangladesh, which we confirm through our field study. Thus, the commonly adopted technology-based technique (such as smartphone app-based techniques) for providing healthcare supports to such people is not a feasible one even to ponder. However, there exist different healthcare services in Bangladesh intended for the beggars and other similar poor people, which mostly remain obscure to the intended communities. This situation presents a unique challenge in the realm of HCI, where we need to bridge a substantial physical gap between the applicable healthcare services and their intended recipients (beggars in our context). We solve this problem through a carefully-crafted solution (named as “Dakter Bari", which means “Home of a doctor" in English) that is tailored to the applicable ecosystem of the context. We design the solution as per our field study integrating the notions of participatory design and Value Sensitive Design, develop it, and deploy in real cases. Usage of the system for more than six months demonstrates its efficacy in bridging the gap through a technosocial solution going beyond a technology-only approach. Moreover, based on our analyses and findings, we present a new behavior model (going beyond the Fogg’s Behavior Model) that should be applicable to such technosocial solutions.Item Random biometric encryption for military wireless communication with perfect forward secrecy(Department of Computer Science and Engineering, BUET, 2024-01-23) Monowar Ahasan.; A. B. M. Alim Al Islam, Dr.Military operations heavily depend on wireless radio communication, which is valued for its mobility, resilience, interoperability, and security advantages. In military wireless communications, Perfect Forward Secrecy (PFS) is crucial, as PFS prevents the decryption of future messages even with compromised keys. PFS acts as an additional security layer through protecting sensitive military information from unauthorized accesses, and prevent- ing retroactive decryption of intercepted communications, thereby maintaining confidentiality and safeguarding operational integrity. The adoption of PFS enhances the security of mil- itary wireless communication systems, minimizing the risks of information compromise and providing a strategic advantage in the ever-changing threat landscape. In this study, we presented a new approach, accompanied by a hardware experiment, that eliminated the necessity of key exchange during data transmission. Here, we first efficiently transformed analog wireless waves into digital signals and then applied encryption using customized algorithms to ensure PFS. To support our investigation, we developed the necessary software to enhance the hardware’s operational efficiency for achieving the objective of ensuring PFS. The outcome of this research can benefit organizations utilizing legacy wireless radio equipment, handling sensitive data, and seeking advanced communication security. Our study also empowered aging analog wireless transmitters to convert, encrypt, and transmit data using a distinctive encryption technique, preventing the obsolescence of old devices and reducing costs. In this study, we introduced a biometric authentication method that employed finger- print matching in a wireless communication system. This process utilized a pre-established database containing information from authorized users’ fingerprints, combined with system time and preset organizational knowledge (organizational secret), to generate a unique en- cryption key for every data transfer session. Notably, our approach ensured that keys, whether private or public, were not exchanged during data transfer sessions. Rather, each commu- nicating party independently computed its own key for each session, ensuring genuine ran- domness and thereby providing PFS. This methodology enhanced security by eliminating key exchange related vulnerabilities, making it a robust solution for safeguarding data in wireless communication scenarios by ensuring PFS.