Cloud computing platforms are the widely used state of the art platforms by various organizations. Data storage and data sharing services are the most widely used services in the cloud, while the maintenance of data integrity is a big challenge. A public cloud platform which is not reliable, users must generate digital signature of their data and then share generated signature for integrity auditing. Any attack on cloud can compromise the users valuable data which is most likely carried out by external entity. By generating signature we can write the rules of who can access update or delete the data. If data is updated by unauthorized user, then auditing can identify which data is compromised. Here we are using asymmetric keys that is when user upload his/her data over cloud then digital signature will get created with users private key, and when TPA (Third Party Auditor) wants to check the integrity of that users data then he can generate digital signature with users public key. Not only carried out low cost for data storage by compressing data but also established data access protocol to maintain data privacy.