Reversible Data Hiding in Encrypted Text Using Paillier Cryptosystem

TL;DR

This paper introduces a reversible data hiding method in encrypted text using the Paillier cryptosystem, enabling secure embedding and perfect recovery of secret data in cloud environments.

Contribution

It proposes a novel technique for data hiding in encrypted text leveraging homomorphic encryption, ensuring lossless recovery and security.

Findings

Effective data embedding and recovery demonstrated

Works well with different key sizes

Suitable for cloud-based encrypted text processing

Abstract

Reversible Data Hiding in Encrypted Domain (RDHED) is an innovative method that can keep cover information secret and allows the data hider to insert additional information into it. This article presents a novel data hiding technique in an encrypted text called Reversible Data Hiding in Encrypted Text (RDHET). Initially, the original text is converted into their ASCII values. After that, the Paillier cryptosystem is adopted to encrypt all ASCII values of the original text and send it to the data hider for further processing. At the data hiding phase, the secret data are embedded into homomorphically encrypted text using a technique that does not lose any information, i.e., the homomorphic properties of the Paillier cryptosystem. Finally, the embedded secret data and the original text are recovered at the receiving end without any loss. Experimental results show that the proposed scheme is vital in the context of encrypted text processing at cloud-based services. Moreover, the scheme works well, especially for the embedding phase, text recovery, and performance on different security key sizes.