Abstract
This paper proposes a scheme of reversible data hiding in encrypted images based on multikey encryption. There are only two parties that are involved in this framework, including the content owner and the recipient. The content owner encrypts the original image with a key set which is composed by a selection method according to the additional message. Thus, the image can be encrypted and embedded at the same time. Additional message can be extracted given that the recipient side could perform decryption strategy by exploiting spatial correlation; then, original image can be recovered without any loss. Compare with other current information hiding mechanism, the proposed approach provides higher embedding capacity and is also able to perfectly reconstruct the original image as well as the embedded message. Rate distortion of the proposed method outperforms the previously published ones.
Highlights
Nowadays, information hiding is gaining considerable attention
We can all acknowledge that information security is absolutely necessary in our daily life, and information hiding algorithm brings a new solution to this issue
Majority of Wireless Communications and Mobile Computing former information hiding mechanisms embed the additional bits into original images directly, in other words, the embedding is performed over the plaintext domain
Summary
Information hiding is gaining considerable attention. In the cloud computing environment, in order to ensure the information security, the uploaded images generally need to be encrypted in advance. In a cloud computing case, if the content owner who wish to send information to remote server without disclosure, he or she can embed the secret information in an image to make the original image encrypted. The purpose of reversible data hiding is to recover the embedded bits while the original image can be correctly reconstructed. Majority of Wireless Communications and Mobile Computing former information hiding mechanisms embed the additional bits into original images directly, in other words, the embedding is performed over the plaintext domain. The lossless compression-based methods make full use of the compression algorithm to vacate certain space for information embedding which was widely used in early information hiding research. We bring an algorithm based on multikey encryption forward, which allows the content owner encrypt the original image while embedding the additional information.
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