期刊名称：International Journal of Innovative Research in Science, Engineering and Technology
印刷版ISSN：2347-6710
电子版ISSN：2319-8753
出版年度：2015
卷号：4
期号：7
页码：5221
DOI：10.15680/IJIRSET.2015.0407026
出版社：S&S Publications
摘要：Data hiding techniques are used for data security and copyright purposes. Cryptology deals with codingand decoding secret messages. Data hiding, which is a form of Steganography, is embedding data into digital media.Reversible data hiding is embedding data into an image in reversible manner which means that the embedded data andthe cover image can be recovered without any distortion. This project aims at a novel Reversible data hiding techniquein encrypted images in which two tasks, data hiding and image encryption are kept separable and space required foradditional data is created before image encryption. This technique uses predictive coding along with modified orimproved histogram bin shifting method. Additional space required for data is created by estimating some randomlyselected pixels. Advanced Encryption Standard (AES) is used for encryption of rest of the pixels. Data hiding is donewith Improved or modified histogram bin shifting method to yield better quality of restored image. Objective of thisproject is to provide security to data to be embedded as well as to the cover image and to recover data and cover imagewithout any distortion. As data hiding and image encryption tasks are kept separable, without the encryption key onecannot get access to original image and hence image privacy is maintained. Also, only with the data hiding key, onecan embed the data in and extract out from the cover image without the knowledge of image. This technique yieldsimproved efficiency with respect to embedding rate and Peak Signal-to-Noise-Ratio.
关键词：Embedding capacity; Embedding rate; Histogram Bin Shift; Histogram Shift; Image encryption; Image;recovery; Image restoration and Reversible data hiding
