Cryptographic Implementation of Aggregate-Key Encryption for Data Sharing in Cloud Storage

Cloud computing provides the platform to share the application. In order to share data with other security mechanisms like cryptography is necessary. The success of data sharing on cloud depends on how we store and manage the key values. Motivation behind using elliptic curve cryptography is it will easy to find public key family with shorter operation and short keys of elliptic curve cryptography are as strong as long keys of RSA. This paper proposes an aggregate-key cryptosystem in which decryption key generation mechanism is so powerful that the generated aggregate key is able to decrypt any subset of cipher text classes generated during data upload. However the situation like modification of files in cloud environment is also discussed in this paper.