| 摘要 |
A system and a method for hiding reversible information decode an information-hiding document file into a bit block unit of a predetermined length by applying a preset restoration format when reversible information is extracted from the information-hiding document file where hidden information data is encoded in a compressed document file, analyze a plurality of characters included in the decoded bit block based on preset information analysis criteria, calculate an information index including at least one among a meaningful index, a meaningless index and a document index according to the analysis results, extract a hidden information bit hidden in the bit block based on a comparison result between the calculated information index and a preset information index threshold, convert a bit value before decoding for each bit block based on a value of the hidden information bit, and restore the bit block, of which the bit value is converted, into an original document file by decoding the bit block in a restoration format. |
