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Using cloud storage services, user can store their large amount of data such as confidential documents, mails etc in the cloudto avoid the expenditure of local data storage and maintenance. So that cloud server is mostly being used, to ensure the integrity of the data stored in the cloud. However data security is one of the major barriers to adoption in cloud storage. In multinational companies, employees can share their data such as files, documents, mails and so on. Even user can able to upload their data on cloud storage without worrying about to check or verify integrity. User can store data and used on demand .User needs to employ his private key to generate the data authenticator for realizing the data integrity auditing. Thus user needs to store his private key and also memorize the password to activate the private key. But sometimes private key and password will be forgotten or hack by third party. In order to overcome this problem, we proposed a new paradigm called Data Integrity Auditing without Private Key Storage for Secure Cloud Storage and design such a scheme. In this, we use digital signature scheme in order for the websites, security organizations, banks and so on to verify user’s validity
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