BLOCKCHAIN-BASED PRIVACY-PRESERVING DEDUPLICATION AND INTEGRITY AUDITING IN CLOUD STORAGE

Abstract

The cloud storage services are growing fast. This means we have to make sure our data is safe and we do not waste space. One way to do this is by using data deduplication. Data deduplication is used by a lot of people to get rid of copies of data and save money on storage. However, the current ways of doing data deduplication and checking if everything is okay often show information, like who owns a file and how we know it is real. This is a problem because it can hurt our privacy. Also, the old ways of doing things are complicated when it comes to managing keys. They usually need a third party that we have to trust completely which is not always a good idea. Cloud storage services and data deduplication are important so we need to find a way to make sure our data is safe and private. This paper is trying to solve some problems. It suggests using a blockchain-based system to keep data private and make sure it is not changed when it is stored in the cloud. The system makes sure that only the people who are supposed to see the data can see it. It also makes sure that the people who own the files are protected. The system uses a way of encrypting data so that people can share files without having to get a new key every time. This makes it easier to manage who can see the files and it reduces the amount of work that the servers have to do. The blockchain-based system and the special encryption work together to make sure that cloud storage environments are secure and private. Cloud storage environments and blockchain-based systems are important, for keeping data safe and private. So when we use the blockchain we can set up something called contracts. The smart contracts on the blockchain are used to make sure everything is honest and fair. This means we do not have to rely on a third party auditor to make sure everything is okay. The smart contracts on the blockchain help us be more open and trustworthy. We use the contracts on the blockchain to make things more transparent. The blockchain and the smart contracts on the blockchain are very useful, for this. Security analysis demonstrates that the proposed scheme effectively resists various privacy and integrity threats. Experimental evaluations further show that the system achieves efficient deduplication and auditing with acceptable computational and storage overhead, making it suitable for practical cloud storage applications.