Browsing by Author "Mshangi, Maduhu"

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    Homomorphic cryptography techniques-based algorithm for enhanced privacy of users’ data in social network systems in Ubiquitous computing
    (University of Dar es Salaam, 2019) Mshangi, Maduhu
    The use of social network systems (SNS) for interaction and sharing of information across the globe has led to new vulnerabilities and cyber threats. This has resulted in privacy violation of users’ data in SNS such as Facebook, Twitter, LinkedIn and Instagram. Privacy violation of users’ data is the problematic situation in which many researchers are trying to address. The study adopted soft systems methodology compounded with design science research to guide the research process. The research methods used include heuristic evaluation inspection experiment and divide and conquer. The study assessed the effectiveness and efficiency of the existing privacy controls in SNS to ascertain the research gap status quo. It revealed that the existing privacy controls in the SNS are not adequate in addressing privacy violation in SNS. The study proposes an algorithm for enhancing the privacy of users’ data in SNS based on homomorphic cryptography techniques. The performance analysis of the proposed algorithm was carried out using Big O notation and controlled experiment. The study found that the proposed algorithm has a time complexity of and execution time of shorter than 0.094 seconds for keys size of at most 1024 bit. It was compared with other related algorithms in a similar environment; their execution times were found to be more than 0.116 seconds. Thus, the proposed solution can be adopted to enhance the privacy of users’ data in SNS. It can be extended to other services accessible via untrusted environments.
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    Usability of money transfer information systems: the case of swift and tiss in Tanzania
    (University of Dar es Salaam, 2007) Mshangi, Maduhu
    The main objective of this study was to explore the usability of money transfer information systems in Tanzania. The study specifically addressed: linkage between reliability and usability; relationship between accessibility and usability; relationship between affordability and usability; of money transfer information systems. Respondents were drawn from 36 financial institutions which are members of SWIFT and TISS in Tanzania; 34 members are in Dar es Salaam region, 1 in Zanzibar and 1 in Kilimanjaro region. Questionnaire were adopted as the main tool of collecting data, variables and hypotheses were identified and developed to obtain statistical relationship. The results reveal that there is strong positive relationship between affordability and usability; strong positive relationship between efficiency and usability of money transfer information systems. This study concludes that in order to increase usability of money transfers information’s systems. Usability is a function of accessibility, affordability, reliability and efficiency of money transfer information systems.