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  • Wiley  (2)
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  • Wiley  (2)
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  • 1
    Online Resource
    Online Resource
    Wiley ; 2024
    In:  SECURITY AND PRIVACY Vol. 7, No. 1 ( 2024-01)
    In: SECURITY AND PRIVACY, Wiley, Vol. 7, No. 1 ( 2024-01)
    Abstract: Attribute‐based encryption (ABE) is a prominent cryptographic tool for secure data sharing in the cloud because it can be used to enforce very expressive and fine‐grained access control on outsourced data. The revocation in ABE remains a challenging problem as most of the revocation techniques available today, suffer from the collusion attack. The revocable ABE schemes which are collusion resistant require a semi‐trusted manager to update the secret keys of nonrevoked users in order to achieve revocation. This introduces computation and communication overhead, and also increases the overall security vulnerability. In this paper, we propose two collusion resistant revocable ABE schemes that do not require any semi‐trusted entity. Our first scheme supports revocation at the user‐level that is equivalent to revoking all the attributes from a user. Our second scheme supports revocation at the attribute‐level that enables more fine‐grained revocation by allowing selective attribute(s) revocation from a user. We call them user‐level revocable ABE (ULR‐ABE) and attribute‐level revocable ABE (ALR‐ABE), respectively. For both the schemes, the secret keys of the nonrevoked users are never affected and the decryption algorithm has the same performance as the baseline ABE scheme. We are able to achieve these at the cost of some increase (compared to the baseline scheme) in the size of the secret key and the ciphertext.
    Type of Medium: Online Resource
    ISSN: 2475-6725 , 2475-6725
    URL: Issue
    Language: English
    Publisher: Wiley
    Publication Date: 2024
    detail.hit.zdb_id: 2922599-1
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  • 2
    In: Journal of Paediatrics and Child Health, Wiley, Vol. 58, No. 7 ( 2022-07), p. 1215-1220
    Abstract: Zinc is an adjunct to oral rehydration salts for management of diarrhoea in children. Due to zinc's unpleasant taste, children often develop nausea and/or vomiting. We aimed to assess acceptability (tolerability) and adherence of improvised formulation of zinc tablet among under‐five children with acute diarrhoea. Methods This was an open‐label intervention trial among 3–59 months old diarrhoeal children attending the outpatient department of Dhaka Hospital, who were enrolled in two age strata, 3 to 〈 18 months and 18–59 months. Zinc tablets 10 or 20 mg per day were prescribed for a total of 10 days for 〈 6 months and ≥6 months age children respectively, with follow‐up. Diary‐cards were used to record events. Results In stratum 1, 158 (90.8%) children and in stratum 2, 144 (95.4%) children completed the study as per protocol out of 325 enrolled children. Sociodemographic, clinical and anthropometric measurements were comparable in the two strata except admission diarrhoeal duration (median 3 days vs. 2 days, P  = 0.001). Adherence to 10 days treatment was 123 (77.8%) in stratum 1 and 127 (88.2%) in stratum 2. Zinc tablets were tolerated very well/well in 280 (92.7%) children. Vomiting, regurgitation and nausea were observed in 99 (32.8%), 59 (19.5%) and 22 (7.4%) children respectively. Caregivers' willingness to use the same drug in future was 300 (99.3%) among all children. Conclusion Our study findings demonstrate that modified taste and formulation zinc tablets were well tolerated, and caregivers' willingness to use this formulation in future supports its acceptability, adherence and palatability.
    Type of Medium: Online Resource
    ISSN: 1034-4810 , 1440-1754
    URL: Issue
    Language: English
    Publisher: Wiley
    Publication Date: 2022
    detail.hit.zdb_id: 2007577-7
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