Integrity Checking Using Third Party Auditor in Cloud Storage

Cloud computing, nowadays, is one amongst the rapidly developing technologies around the world which provides a variety of services to its users. One of the salient services offered by the cloud to its users is Storage as a Service(STaaS). This service makes its user burden free from the task of storing and maintaining data by allowing him to transfer his data to a remote storage server and access it remotely. The user's data is maintained, managed and backed up by the cloud and is made available to him over the internet. But the main concern while using this type of service is the privacy and integrity of stored data. The data stored at remote locations may be accessed, modified or damaged by an attacker. Users require their data to be safe from all such unauthorized activities hence techniques for data integrity verification are needed to check whether the integrity of stored data is intact or not. Integrity verification is a challenging task because the user doesn't posses the data locally. The proposed scheme checks the integrity of data stored at remote location through a third party auditor using bilinear pairing. Later, aggregation is applied over the proposed scheme for further optimization.