A Secure Image Hiding Scheme with

A Secure Image Hiding Scheme withAuthentication
一個具有認証能力的安全影像隱藏機制
來源：http://ethesys.lib.fcu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0705104-161910
作者：Shih-Cheng Chen
Image hiding aims to embed a secret image into a cover image to form a stego-image, transmitted over the public networks without revealing the secret image. To our best knowledge, the previous research of image hiding mainly focuses on privacy, good image quality, and high hiding capacity. However, there are two inevitable issues, not address in present image hiding schemes. Firstly, authentication, ascertaining the origin and integrity of the transmitted images, is an important issue for the transmitted images. Secondly, some parameters of image hiding are all shared by sender and receiver in advance so that the hidden image can be correctly extracted. Nevertheless, if a lot of information has to be shared/transmitted by a secure channel in advance, image hiding becomes impractical. In this thesis, a new secure image hiding scheme, in which the VQ technique is adopted to compress secret images before embedding, is proposed to convey several secret images. Other then satisfying the basic properties of image hiding such as privacy, good image quality, and high hiding capacity, the proposed scheme has other valuable advantages. Firstly, for transmitting codebook, not only secret images but also the corresponding codebook is embedded into the cover image. As a result, the codebook can be automatically extracted by the intended receiver for decompression in extracting process. Secondly, the proposed scheme highlights a future, image authentication of both the stego-image and secret images, often existing in image security mechanisms but seldom addressed in present image hiding schemes. Thirdly, for transmitting the parameters used in extraction process, digital signature is also applied to convey the corresponding parameters