IRJET - Multi Authority based Integrity Auditing and Proof of Storage with Data Deduplication in Cloud

This document proposes a method for secure data storage and integrity auditing in the cloud using multi-level encryption and data deduplication. The method first checks for duplicate files using hash comparisons and avoids uploading duplicate data to save storage space. It then encrypts data using AES, DES and RSA algorithms sequentially, generating keys each time. The keys are then re-encrypted using AES and stored on separate servers. This multi-level encryption and distribution of encrypted data and keys across servers makes the data more secure. It also enables proof of storage and authentication of authorized users using time-based keys.