1,721,085 research outputs found
A privacy-preserving e-participation framework allowing citizen opinion analysis
No full textIn e-democracy, e-participation represents a key component, as it is the way to adapt government decisions to the real expectations of citizens. The availability of information-communication technologies represents the basis for the implementation of concrete plans of citizens' participation to the government of the community. However, there is a non trivial trade-off to manage, between security and privacy needs and opinion analysis opportunities. Indeed, whereas we have to guarantee that the action of citizens is kept anonymous, relating opinions to information about people allows the government management to coherently orient the executive action. In this paper, we present a solution of the above trade-off, by proposing a framework relying on existing social networks and working through cryptographic protocols able to ensure citizens' anonymity yet enabling opinion analysis. A careful security analysis and the addressing of the main implementation issues make the proposal ready to a secure and feasible adoption in real-life contexts
Enabling secure health information sharing among healthcare organizations by public blockchain
No full textThe facilitation of sharing and exchanging patients’ health records is a paramount opportunity in e-health, enabling healthcare providers to garner a comprehensive and clear perspective of patients’ medical histories without necessitating direct inquiries. Besides this great advantage, it introduces substantial issues on security and privacy, mainly related to unauthorized access to e-health records when different healthcare service providers maintain records. In this paper, we deal with this problem and propose using the blockchain technology (1) to obfuscate the linkage between patients’ identities and their e-health records and (2) to grant access to e-health records exclusively to entities authorized by patients themselves. Key outcomes include using a digital identity based on the Electronic Identification, Authentication, and Trust Services Regulation (eIDAS) to control access to these records, and a concrete implementation by adopting the Ethereum blockchain. Our solution relies on using a public blockchain, which is an improvement for the state of the art, in which only private or consortium blockchains have been proposed. The resulting solution has been analyzed, and the effectiveness and affordability of the proposal have been shown
A lightweight electronic signature scheme using Twitter
No full textIn many application contexts, qualified electronic signature are difficult to adopt due to cost and technological reasons. As the Euro- pean legislation admits the use of (non-qualified) electronic signatures in several cases, the design of new signature protocols with cheapness and usability features is a challenging issue. In this paper, we propose a new lightweight electronic signature protocol that does not require any public key infrastructure, cryptography and dedicated device, yet guaranteeing a good level of security. The protocol is conceived for closed domains of users, such as the case of documents exchanged between employees of a company. Signature and verification processes rely on the Twitter social network and do not require any changes of its features. A system proto- type has been also designed and implemented to show that the adoption of our solution is both realistic and effective
Overcoming limits of blockchain for IoT applications
No full textBlockchain technology allows the implementation of a public ledger securely recording transactions among peers without the need of trusted third parties. For both researchers and industry, IoT appears a domain in which there would be extraordinary benefits if the features of Blockchain can be exploited. Indeed, the possibility that IoT devices participate in public shared transactions enables a lot of challenging applications. However, there are some aspects that may limit the use of Blockchain in IoT. These are mainly related to the low computational power and storage capabilities of IoT devices. In this paper, we propose an alternative way to implement a public ledger overcoming the above drawbacks, thus appearing more suitable to IoT applications. Hie proposed protocol leverages the popular social network Twitter and works by building a meshed chain of tweets to ensure transaction security. Importantly, Twitter does not play neither the role of trusted third party nor the role of ledger provider
SISO: a conceptual framework for the construction of" stereotypical maps" in a Social Internetworking Scenario
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