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A Scalable Data Integrity Mechanism Based on Provable Data Possession and JARs
( Faheem Zafar ),( Abid Khan ),( Mansoor Ahmed ),( Majid Iqbal Khan ),( Farhana Jabeen ),( Zara Hamid ),( Naveed Ahmed ),( Faisal Bashir ) 한국인터넷정보학회 2016 KSII Transactions on Internet and Information Syst Vol.10 No.6
Cloud storage as a service provides high scalability and availability as per need of user, without large investment on infrastructure. However, data security risks, such as confidentiality, privacy, and integrity of the outsourced data are associated with the cloud-computing model. Over the year`s techniques such as, remote data checking (RDC), data integrity protection (DIP), provable data possession (PDP), proof of storage (POS), and proof of retrievability (POR) have been devised to frequently and securely check the integrity of outsourced data. In this paper, we improve the efficiency of PDP scheme, in terms of computation, storage, and communication cost for large data archives. By utilizing the capabilities of JAR and ZIP technology, the cost of searching the metadata in proof generation process is reduced from O(n) to O(1). Moreover, due to direct access to metadata, disk I/O cost is reduced and resulting in 50 to 60 time faster proof generation for large datasets. Furthermore, our proposed scheme achieved 50% reduction in storage size of data and respective metadata that result in providing storage and communication efficiency.
Amir Hameed,Zafar Iqbal,Shaheen Asad,Shahid Mansoor 한국식물병리학회 2014 Plant Pathology Journal Vol.30 No.4
Viral diseases have been a major limiting factor threatingsustainable potato (Solanum tuberosum L.) productionin Pakistan. Surveys were conducted to serologicallyquantify the incidence of RNA viruses infectingpotato; Potato virus X (PVX), Potato virus Y (PVY),Potato virus S (PVS), Potato virus A (PVA), Potato virusM (PVM) and Potato leaf roll virus (PLRV) in twomajor potato cultivars (Desiree and Cardinal). Theresults suggest the prevalence of multiple viruses in allsurveyed areas with PVY, PVS and PVX dominantlywidespread with infection levels of up to 50% in someregions. Co-infections were detected with the highestincidence (15.5%) for PVX and PVS. Additionally thedata showed a positive correlation between co-infectingviruses with significant increase in absorbance value(virus titre) for at least one of the virus in an infectedplant and suggested a synergistic interaction. To testthis hypothesis, glasshouse grown potato plants werechallenged with multiple viruses and analyzed for systemicinfections and symptomology studies. The resultsobtained conclude that multiple viral infections dramaticallyincrease disease epidemics as compared tosingle infection and an effective resistance strategy intargeting multiple RNA viruses is required to save po-tato crop.