Outsourcing Data on Cloud Using Aggregate Key

Cloud computing has gained a lot of interest since last few decades due to its expanding services. Data sharing is one of the best options for gaining advantage of utilizing service for sharing the data being uploaded over cloud storage. But its very essential that the data that is being uploaded over the cloud storage is to be maintained securely and data confidentiality is also the aspect to be considered with importance. To achieve this, the proposed system derives a novel algorithm or architecture which makes use of the public key cryptographic technique. This public key cryptographic system generates constant size cipher text. The keys are to be maintained secretly. These secret keys can be then delivered to obtain the actual plain text from the cipher texts. The encrypted files are maintained over cloud storage and the aggregate key, on request from the group user is sent to the corresponding users mail id. This obtained aggregate key is then utilized for decrypting the download file. The proposed system shows how the KAC helps is maintaining the aggregate key architecture for managing the cloud storage for encrypted files.