dc.description.abstract | Abstract
Due to the fast development of scientific technologies, cryptography has been widely used for information security. However, the using of cryptograph is easy to be detected. The use of those provided on public network or commercial enciphering products has to worry about the trapdoor problem. If we use private security system, the private protocol or particular transmission preambles will attract the attention of intelligentsia and hackers to access and attack it. Nowadays, due to the popular application of multi-media and transmission via network, the data embedding technologies have been widely applied for information protection, data monitoring and tracking, copyright protection, and source authentication. Under such situation, hiding confidential information or encryption scheme inside an image and covered by its unsuspicious outlook can gain double security.
Recently, the development of data hiding techniques to hide annotations, confidential data, or side information into multimedia attracts the attention of researchers in various fields, especially in digital library. One of the essential tasks in digital library is the digitization of arts together with the corresponding textural descriptions. Although there are some standard interleaving algorithms for hiding the relating textural description into an image or video, the textural information is prone to be easily accessed and extracted by hackers. The data hiding mechanism can be utilized in the application of digital library and can obtain some benefits, such as the saving of storage, content authentication, and file management. However, most of traditional data hiding schemes focus on the recovery of covert information. The common shortcoming is that the original image will be distorted due to the processing of bit-substitution, quantization and truncation.
In this dissertation, we propose some lossless data hiding methods based on pixel decomposition, pair-wise logical computation (PWLC) and phase difference which can achieve the goal of complete recovering of covert information and lossless reconstruction of original image simultaneously. Among the above three rationales, the rational of PWLC has proposed to remedy the shortcoming that most of the data hiding mechanism can not reconstruct the hidden information and original host image simultaneously. In addition, it also obtains high data hiding capacity and good visual quality. Furthermore, the task of tampering detection can also be achieved in the proposed method to ensure content authentication. Experimental results demonstrate the feasibility and validity of our proposed method. | en_US |