RESEARCH ON THE EXTRACTING AND RESTORING TECHNOLOGY OF HIDDEN INFORMATION IN NETWORK DATA STREAM

This paper puts forwards the detecting algorithm and the extracting algorithm for hidden information, which are respectively based on domain of variation and still color digital image. Efforts are made to explore the effects of the amplified information of wavelet transformation, the displaying of hidden information and its opposite process. Based on the model of the influence of information hiding on carrier properties, this paper establishes a general mathematical model for extracting hidden information and a positive transfer function and a reverse transfer function oriented to the set of “the influence of information hiding on carrier properties”. After the information is marked, analyzed and extracted, the hidden information can be restored, with satisfactory results for information recognition and analysis. As a result, it is possible to extract electronic evidence of hidden data rapidly.