Protection of PDF Files: a Sharing Approach
Suiang-Shyan Lee, Shuo-Fang Hsu, Ja‐Chen Lin · International Journal of u- and e- Service Science and Technology · 2014
Portable Document Format (PDF) is a popular file format to store documents.Protection of PDF files is thus important.In this paper, we present a (t, n) PDF-sharing scheme which shares the given secret PDF file F among n stego-PDF files.Each stego-PDF file looks completely identical to its original PDF version.When people collect sufficient number (t) of stego-PDF files among the n created stego-PDF files, the secret PDF file F can be revealed error-freely, while less than t stego-PDF files gets nothing but noise.Therefore, our protection not only tolerates missing, but also resists thief's peeping.As a result, the scheme provides the readers a different approach to the protection of important PDF files, in a manner quite distinct from the watermark or encryption approaches used by commercial PDF makers.