![]() He holds a PhD in Computer Science from The University of Liverpool (United Kingdom), a Master and Bachelor's degrees in Computer Science from Universiti Teknologi Malaysia (Malaysia). He completed his PhD in 2012 looking at intelligent approaches to identify patterns for prediction of medical image data to provide support for disease screening. His recent works are on investigation of ensemble approaches for medical image analysis, modeling of social media data with sarcasm content to support sentiment analysis and investigation of method to ensure cloud data storage integrity. His research work addresses the challenges in knowledge discovery and data mining to identify patterns for prediction on structured and/ or unstructured data his particular application domains are medical image analysis and understanding and sentiment analysis on social media data. Mohd Hanafi Ahmad Hijazi is a senior lecturer at the Faculty of Computing and Informatics, Universiti Malaysia Sabah in Malaysia. Finally, the potential future work of PoR schemes and future trends of cloud storage are presented. Some possible countermeasures to address the identified issues are suggested. Then, the issues and challenges as a result of employing PoR specifically and cloud storage generally are described. The objective of this paper is to examine the state-of-the-art of PoR and subsequently to identify the issues of employing PoR on cloud storage and suggest possible solutions. Although PDP and PoR have similar functionality for providing cloud data integrity and availability, PoR is found to be much better than PDP with respect to full data retrievability as PoR provides recovery to faulty or corrupted outsourced data in which PDP does not cover. ![]() PDP and PoR are protocols designed for cloud storage to proof to clients that the stored data is intact. There are two main cloud integrity schemes available to ensure data integrity and availability: (i) Provable Data Possession (PDP) and (ii) Proof of Retrievability (PoR). This indicates a need for cloud storage providers to adopt cloud integrity schemes to ensure the outsourced data is secured to gain trustworthiness from clients. Hence, a huge number of businesses around the world remains choosing traditional storage method over cloud storage. Due to the openness nature of cloud storage, trustworthy to the storage providers remains a critical issue amongst data owners. Cloud storage has emerged as the latest trend for data storage over the traditional storage method which consume more storage spaces of data owner resources for backup and disaster recovery purposes.
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