Enhanced RSA Algorithm with varying Key Sizes for Data Security in Cloud

Cloud Computing is a distributed and centralized network of inter connected and inter related systems with one or more IT resources provisioned based on pay-on-demand usage. Even though Cloud consumers or users are more flexible with cloud resources, there exist various issues which bring down the usage of cloud resources. Security issue is the major one among them. Data Security and Privacy, Identity and Access Management, Disaster Recovery/Business Continuity Planning etc., are some of the crisis related to data stored on the cloud. Since the cloud users are more concerned with their data, its security is a major issue which has to be dealt seriously. Securing the users' data can be achieved by the conventional method of Cryptography. Encryption is done by using any one of the popular symmetric or asymmetric key algorithms such as AES, DES, RSA, Blowfish and Triple DES etc., RSA algorithm which is a asymmetric key algorithm using two different keys for encryption and decryption processes. The Key size can be varied to make the encryption process strong. Hence it is difficult for the attackers to intrude dthe data. Increasing key size correspondingly increases the time taken for encryption and decryption process. The proposed algorithm reduces the time of encryption and decryption processes by dividing the file into blocks and enhances the strength of the algorithm by increasing the key size. This strength paves the way to store data in cloud by the users without any inconvenience.