SECURING CLOUD BY ID-BASED HYBRID ENCRYPTION SCHEME

Abstract

Cloud computing has seen tremendous growth in the last decade. It allows end users to share their data with each other easily. Cloud computing comes with numerous possibilities and challenges simultaneously. With increasing cloud capabilities, security has become a major challenge to the cloud. Can users trust cloud completely? Is their data secure on cloud? These questions are surfacing with no trustworthy solutions yet. Multi user data sharing should be secure and integrity should be achieved on cloud. The methods like IBE (Identity Based Encryption), ABE (Attribute Based Encryption) etc. are widely used in cloud computing environment to achieve the data security. However, the problems associated with IBE are extra overhead on private key generator (PKG) for computations required during the user revocation process. The two main research problems related to using IBE for cloud computing security are efficient revocation scheme and security enhancement. The goal of this research is to introduce a scheme to address both of these problems. In this thesis a novel hybrid Identity Based scheme is presented with an end goal to manage both security enhancement and efficient revocation. This hybrid technique is a mix of two widely used security methods- IBE and ABE. The Attribute Based Encryption method is blended with Identity Based Encryption to realize robust security against different threats. Another issue with efficient revocation is tended to by introducing outsourced computation into hybrid IBE method with server aided settings.