PDF Steganography based on Chinese Remainder Theorem

TL;DR

This paper introduces novel PDF steganography techniques utilizing the Chinese Remainder Theorem to embed secret messages invisibly within PDF files, ensuring minimal alteration and secure transmission.

Contribution

It presents new methods for hiding messages in PDFs based on the Chinese Remainder Theorem, improving concealment and security over existing techniques.

Findings

Effective embedding of secret messages in PDFs.

Ensures the number of inserted A0 is less than message length.

Methods are invisible to standard PDF readers.

Abstract

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 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, ensure the condition that the number of inserted A0 is less than the number of characters of the secret message s.