Abstract
1 Abstract: Cloud Computing is the technology which is gaining wide acceptance day by day .Cloud computing is a technology which provides different services like software as a service (Saas), Platform as a service (Paas) , Infrastructure as a service (Iaas).These services are provided through the internet. It is a challenge for computer user to store all the data that they have acquired because storage space is limited. So people prefer to buy hard disk and invest their money in it. Others use external devices like USB drives .But some prefer to store their data on cloud storage. There are many advantages of cloud storage such as easy scale up, easy scale down and many more. Along with advantages, it also brings some security related challenges. Clients move their data to remotely located server called cloud storage. But in cloud computing there is no provision to check the integrity of the data which is stored by the client. So there is need to overcome this challenge for efficient use of this technology. In this paper we are focusing on the basics of cloud storage, working of cloud storage system, various concepts related to data integrity like overview of data integrity, physical vs. logical integrity, Types of integrity constraints and survey on basic data integrity proving schemes. The basic data integrity proving schemes are Provable Data Possession (PDP) and Proof of Retrievability (PoR). On the basis of these schemes various techniques are proposed by different researchers. We also observe these techniques in this paper.
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