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Volume: 31 | Article ID: art00015
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Nondestructive ciphertext injection in document files
  DOI :  10.2352/ISSN.2470-1173.2019.5.MWSF-541  Published OnlineJanuary 2019
Abstract

We describe how container files in Portable Document Format (PDF) can be modified to inject modifiable pads for use in a steganographic file system. This produces a footprint that is less conspicuous than a randomized disk volume or disk image file. The PDF standard can be exploited to inject a modifiable segment into a file, without affecting the file’s interpretation or validity; these can be disguised as high-entropy segments that commonly occur in PDF files. We show two methods of achieving this embedding.

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Scott Craver, Enshirah Altarawneh, "Nondestructive ciphertext injection in document filesin Proc. IS&T Int’l. Symp. on Electronic Imaging: Media Watermarking, Security, and Forensics,  2019,  pp 541-1 - 541-9,  https://doi.org/10.2352/ISSN.2470-1173.2019.5.MWSF-541

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