Contriving Hybrid DESCAST Algorithm for Cloud Security

Cloud computing has taken a major part in IT industry both for an individual and the organization. Primarily, it's used as infrastructure as a service, platform as a service, file storage, disaster recovery and backup. In cloud computing, protection of data in server and while in media is a challenging issue. Our proposed encryption algorithm Hybrid DESCAST has been designed to provide the security of huge volume of data sent through the media and the same will remain encrypted in the cloud sever. This cipher text will be decrypted only when the same is required to be used by the authenticated user. Problems of individual DES and CAST Block Cipher Algorithm have been tackled by our proposed encryption algorithm. Complexity and Computation time for encryption and decryption for our proposed algorithm is higher than the individual DES and CAST algorithm. This paper is focused to provide security of data in cloud server, as well as for the data while transferring from client to cloud server and vice versa.