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Symmetry 2018, 10(1), 23; https://doi.org/10.3390/sym10010023

Separable Reversible Data Hiding in Encrypted Signals with Public Key Cryptography

1
Department of Information Communications, Chinese Culture University, Taipei 111, Taiwan
2
Department of Computer Science and Information Engineering, National Taichung University of Science and Technology, Taichung 404, Taiwan
*
Author to whom correspondence should be addressed.
Received: 5 December 2017 / Revised: 26 December 2017 / Accepted: 9 January 2018 / Published: 10 January 2018
(This article belongs to the Special Issue Emerging Data Hiding Systems in Image Communications)
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Abstract

We propose separable reversible data hiding in an encrypted signal with public key cryptography. In our separable framework, the image owner encrypts the original image by using a public key. On receipt of the encrypted signal, the data-hider embeds data in it by using a data-hiding key. The image decryption and data extraction are independent and separable at the receiver side. Even though the receiver, who has only the data-hiding key, does not learn about the decrypted content, he can extract data from the received marked encrypted signal. However, the receiver who has only the private key cannot extract the embedded data, but he can directly decrypt the received marked encrypted signal to obtain the original image without any error. Compared with other schemes using a cipher stream to encrypt the image, the proposed scheme is more appropriate for cloud services without degrading the security level. View Full-Text
Keywords: separable reversible data hiding; homomorphic cryptosystem; encrypted signal; public key cryptography separable reversible data hiding; homomorphic cryptosystem; encrypted signal; public key cryptography
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Tai, W.-L.; Chang, Y.-F. Separable Reversible Data Hiding in Encrypted Signals with Public Key Cryptography. Symmetry 2018, 10, 23.

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