Cha-Cha 20: Stream Cipher Based Encryption for Cloud Data Centre

In Cloud computing is a paradigm for implementing universal, beneficial and on demand access to shared collection of configurable computing resources. Cloud computing environment has merits of elasticity, pay-per-use model, streamline processes, improved flexibility and accessibility, better resource utilization, help to achieve economic of scale, anywhere - anytime collaboration, disaster recovery etc. Security possesses major threat as data is viably revealed to third party. Virtualization is one of the methods to resolve security issues of cloud environment and also provide adaptability to host multiple OS stacks on single hardware to improve resource utilization. But virtualization model also have major security issues. In this paper, we introduce an efficient stream cipher based cryptographic method to increase security of encrypted data at cloud data center which is time and cost efficient at both encryption and decryption and also maintains integrity of virtual machine or virtual machine's disks.