A probabilistic public key encryption switching scheme for secure cloud storage

Abstract

AbstractThe high demand for user-centric applications such as secure cloud storage laid the foundation for the development of user-centric security schemes with multiple security features in recent years. But, the current state-of-art techniques primarily emphasized only one type of security feature i.e., either homomorphism or non-malleability. To fill this gap and provide a common platform for both homomorphic and non-malleable cloud applications, we have introduced a new public key-based probabilistic encryption switching method. The proposed scheme generates $${\mathcal {O}}$$ O (m+2 log N) bits of ciphertext where $$m\in {\mathbb {N}}$$ m ∈ N and $$m<n$$ m < n , $$n\in {\mathbb {N}}$$ n ∈ N is the plaintext size, N is the RSA composite. The superior performance of the proposed scheme has been tested in comparison to existing methods and is reported in this paper.