A Comparative Review on Homomorphic Encryption for Cloud Security

With the increase in traffic on cloud servers due to the shifting of various services, information security has become a matter of major concern. This paper describes the security issues influencing cloud computing, compares the performance of traditional and the latest security techniques, and focuses on the challenges facing its implementation. Traditional schemes like RSA, ElGamal, and Pailler Algorithms do not allow operations to be carried out on the encrypted data, whereas the Homomorphic Encryption Scheme allows computation in the encrypted state without decrypting it to the original form. Thus, the security is ensured and also, there is no need to share the secured key. Fully Homomorphic Encryption Algorithms like: Gentry’s Encryption Scheme, Dijk-Gentry-Halevi-Vaikunthanathan Scheme (DGHV), Brakerski-Vaikuntanathan Schemes (BGV) and Multi-key fully Homomorphic encryption are advanced techniques that provide security for the cloud are also described.