Protection of PDF Files: a Sharing Approach

Lee, Suiang-Shyan; Hsu, Shuo-Fang; Lin, Ja‐Chen

doi:10.14257/ijunesst.2014.7.2.03

Cited by 3 publications

(1 citation statement)

References 8 publications

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“…In many other studies on PDF Steganography, authors based their approaches on these methods or the elements that characterized them. These methods have proven their ability to exchange sensitive data securely [19,29,50,51] when using common PDF readers and to add copyright information [22,56] to the PDF files.…”

Section: Text Steganography Based On Pdf Filesmentioning

confidence: 99%

Combinatorial-based Steganographic Scheme for PDF File Justified Texts

Ekodeck¹,

Ebele²,

Ndoundam³

2022

Preprint

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In this paper, we proposed a method that exploits justified texts of PDF files to embed secret data. The method is inspired by the work of Khosravi et al on "A new method for pdf steganography in justified texts" where they proposed a stegosystem allowing to embed in particular lines called a host line, 4 bits of secret message. We've improved it by exposing a combinatorics-based method able not only to embed 7 bits of secret message in these host lines but also b bits (b<14) in any line containing at least n spaces and m added spaces for (m, n > 0), thus allowing a sender to conceal a bigger message with very few changes made to the cover text.<br>

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Section: Text Steganography Based On Pdf Filesmentioning

confidence: 99%

Combinatorial-based Steganographic Scheme for PDF File Justified Texts

Ekodeck¹,

Ebele²,

Ndoundam³

2022

Preprint

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PDF steganography based on Chinese Remainder Theorem

Ekodeck

Ndoundam

2016

Journal of Information Security and Applications

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We propose different approaches of PDF files based steganography, essentially based on the Chinese Remainder Theorem. Here, after a cover PDF document has been released from unnecessary characters of ASCII code A0, a secret message is hidden in it using one of the proposed approaches, making it invisible to common PDF readers, and the file is then transmitted through a non-secure communication channel. Where each of our methods, tries to ensure the condition that the number of inserted A0 is less than the number of characters of the secret message s.

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Progressive sharing of multiple images with sensitivity-controlled decoding

Chang

Lee

Yeh

et al. 2015

EURASIP J. Adv. Signal Process.

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Secure sharing of digital images is becoming an important issue. Consequently, many schemes for ensuring image sharing security have been proposed. However, existing approaches focus on the sharing of a single image, rather than multiple images. We propose three kinds of sharing methods that progressively reveal n given secret images according to the sensitivity level of each image. Method 1 divides each secret image into n parts and then combines and hides the parts of the images to get n steganographic (stego) JPEG codes of equal importance. Method 2 is similar; however, it allocates different stego JPEG codes of different 'weights' to indicate their strength. Method 3 first applies traditional threshold-sharing to the n secret images, then progressively shares k keys, and finally combines the two sharing results to get n stego JPEG codes. In the recovery phase, various parameters are compared to a pre-specified low/middle/high (L/M/H) threshold and, according to the respective method, determine whether or not secret images are reconstructed and the quality of the images reconstructed. The results of experiments conducted verify the efficacy of our methods.

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Protection of PDF Files: a Sharing Approach

Cited by 3 publications

References 8 publications

Combinatorial-based Steganographic Scheme for PDF File Justified Texts

Combinatorial-based Steganographic Scheme for PDF File Justified Texts

PDF steganography based on Chinese Remainder Theorem

Progressive sharing of multiple images with sensitivity-controlled decoding

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