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Attribute-Based Secure Data Sharing with Efficient Revocation in Fog Computing

Journal of Information Security 2017年第3期8卷 203-222页

作者： Asma Alotaibi Ahmed Barnawi mohammed buhari Department of Information Technology King Abdulaziz University Jeddah Saudi Arabia

Fog computing is a concept that extends the paradigm of cloud computing to the network edge. The goal of fog computing is to situate resources in the vicinity of end users. As with cloud computing, fog computing provides storage services. The data owners can store their confidential data in many fog nodes, which could cause more challenges for data sharing security. In this paper, we present a novel architecture for data sharing in a fog environment. We explore the benefits of fog computing in addressing one-to-many data sharing applications. This architecture sought to outperform the cloud-based architecture and to ensure further enhancements to system performance, especially from the perspective of security. We will address the security challenges of data sharing, such as fine-grained access control, data confidentiality, collusion resistance, scalability, and the issue of user revocation. Keeping these issues in mind, we will secure data sharing in fog computing by combining attributebased encryption and proxy re-encryption techniques. Findings of this study indicate that our system has the response and processing time faster than classical cloud systems. Further, experimental results show that our system has an efficient user revocation mechanism, and that it provides high scalability and sharing of data in real time with low latency.

关键词： Attribute-Based Encryption Fine-Grained Access Control Fog Computing Proxy Re-Encryption User Revocation

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Prevalence of iron deficiency anaemia among blood donors in Sokoto,North Western,Nigeria

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Journal of Coastal Life Medicine 2015年第4期3卷 312-316页

作者： buhari Hauwa Ali Erhabor Osaro Imrana Sani Abubakar Wase Onuigwe Festus Okwesili Augustine Isaac Zama Yakubu Abdulrahaman Dallatu Kabiru Yeldu mohammed Haruna Faculty of Medical Laboratory Science Department of HaematologyUsmanu Danfodiyo University SokotoSokotoNigeria Department of Clinical Biochemistry Usmanu Danfodiyo University SokotoSokotoNigeria

Objective:To investigate the prevalence and socio-demographic factors associated with iron deficiency anaemia among blood donors in Sokoto,North Western,Nigeria using a combination of haemoglobin haematocrit and serum ferritin measurements.Methods:One hundred and fifty consecutively recruited whole blood donors,comprising of 148(98.7%)family replacement donors and 2(1.3%)voluntary non-remunerated donors aged 18-60 years and mean age 39±21 years constituted the subjects for this study.The full blood count was carried out using Mythic 22 CT fully automated haematology analyser(Orphee SA,Switzerland).Serum was tested for ferritin using a human ferritin enzyme immunoassay kit-ACCU Diag^(™)ELISA Ferritin kit(Diagnostic Automation/Cortez Diagnostic Inc.California,USA).Results:The prevalence of anaemia(haemoglobin<11.0 g/dL)was evident in 24(16%)and iron deficiency anaemia(serum ferritin<12 ng/mL+haemoglobin<11 g/dL)in 5(10%)of donors.The haemoglobin and ferritin levels was significantly lower among regular voluntary remunerated blood donors(13.50±0.00 and 34.88±0.00)compared to family replacement donors(14.10±2.40 and 74.12±45.20)respectively(P=0.01 and 0.05 respectively).The mean haemoglobin and ferritin level was compared among donors based on gender.The haemoglobin and ferritin was significantly higher among male donors(14.20±2.00,78.02±49.10)compared to female donors(12.35±2.5 and 42.20±32.13)(P=0.01).The mean haemoglobin and ferritin level was compared among donors based on occupational groups.The haemoglobin and ferritin was significantly higher among civil servants compared to farmers and students(P=0.01).Conclusions:Iron deficiency anaemia is prevalent among blood donors in Sokoto,North Western,Nigeria.There is need to include routine ferritin in the blood donor testing protocol in the area to enable the diagnosis of donors with latent iron deficiency anaemia to facilitate iron supplementation for regular blood donors at risk and those with iron deficiency anaemia.

关键词： Iron deficiency Anaemia Blood donors Sokoto Nigeria

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