Secure data in cloud computing using homomorphic encryption

The emergence of cloud computing and cyber-physical systems made of security in processing data a major challenge. In order to ensure privacy and confidentiality of the data being manipulated, the use of cryptography is widely used today. In 2009, C. Gentry proposed the first fully homomorphic cryptosystem, to perform calculations on data previously encrypted without having to decrypt. This progress has allowed the opening of many industrial and research perspectives. However, despite recent progress, many limitations remain today on the lack of performance of these systems and their strong memory requirements. In this paper we focus on cloud computing along with its various security and privacy issues, we describe the role of homomorphic encryption scheme for ensuring data privacy and compare its types based on different characteristics. © 2005-2015 JATIT & LLS.