Abstract: Cloud computing is a new venture that offers tremendous advantages in Information Technology. Data may be transferred, processed & stored in the cloud storage provided by service providers in order to leverage the full use of its capacity. However, data users are very sceptical to store their data in cloud storage. The data in cloud storage are out of direct control from their own users. The data stored in private cloud are secured to some extent whereas security of data stored in public cloud are not guaranteed. There are many techniques to protect the confidentiality of data before stored into cloud storage. This paper proposes a novel framework to protect data confidentiality of numeric and non-numeric and to enhance the security of data using cryptographic techniques in public cloud storage before being uploaded into cloud storage.

Keywords: Cloud Storage, Confidentiality, Encryption, Obfuscation, Framework, Security.