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To store voluminous data of the enterprises and organizations opt for cloud storage. Outsourcing data in the cloud allows many autho- rized users to access the data from different geographical locations. The service provider stores the users data in data centers at remote lo- cations. Cloud Service provides infrastructure and web services to the users retrieving an unlimited data and paying the service consumed by the user. The cryptographic primitives use digital signatures for data integrity checking on the remote data. The client is unable to download the whole data stored in data center to validate its integrity. Therefore, efficient techniques required to prove the integrity of their outsourced data with least amount of communication, and computa- tion cost. This paper describes the digital signature schemes used in auditing techniques at client and its performance. [ABSTRACT FROM AUTHOR]