부산대학교 도서관

Security is the major concern about data especially when we are storing it on the cloud and handing over it to the third force as the cloud resource supplier. We store our important data on the cloud in the shape of cipher-text but we have to convert it to plain text to perform calculations on it, which disturb its security including confidentiality, privacy, authentication, etc. so, our ultimate goal was to introduce some of the best encryption technique for securing data. In this regard, we have discussed Homomorphic Encryption (HE) in our paper. This survey is shown how HE could be used to make secure data on the cloud. HE is a technique in which data (plaintext) is converted in cipher-text (unreadable format). Users can perform required calculations on encrypted data without decrypting it and which does not affect the original form of data. This paper aims to focus on the fully homomorphic encryption technique. For this purpose, many approaches were analyzed and we suggested the best approach at the end of the paper.