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Protecting data from malicious attacks during storage and transmission is the reason for using encryption. Encryption can be achieved by two methods-Transposition and Substitution. Transposition refers to changing the order of characters in a given text. On the other hand, substitution is the process of replacing each character of the plaintext with some other character. Using a combination of transposition and substitution for encryption leads to greater security when compared to using either of them separately. Vigenère Cipher is a poly-alphabetic cipher. It is based on the substitution technique which uses multiple substitution alphabets. In this paper, we introduce double columnar transposition on Vigenère Cipher to enhance its security making cryptanalysis difficult.

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The Cloud computing helps enterprises transform business and technology. It is effective in cost, flexible, and it's a proven delivery platform for providing business or consumer IT services over the Internet. The resources of cloud can be scaled easily and deployed rapidly with all services, applications and processes provisioned "on demand", regardless of the location of user or device. Thus cloud computing gives organizations the opportunity to improve the efficiencies of service delivery, streamline IT management, and with dynamic business requirements align the IT services better. In many ways, cloud computing offers the "best of both worlds", providing good support for core business functions along with the capacity to develop new and innovative services. Apart from the usual challenges of developing secure IT systems, cloud computing presents an added level of risk, because essential services are often outsourced to a third party. This aspect of outsourcing makes it difficult to maintain data integrity and privacy, support data and service availability, and demonstrate compliance. This research includes the investigation of implementation structures and assurance provisions for "security" in cloud-based systems •.

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