PDF Steganography based on Chinese Remainder Theorem
This work addresses secure communication for users needing to transmit hidden data in PDFs, but it appears incremental as it builds on existing steganography techniques with a specific mathematical approach.
The authors tackled the problem of hiding secret messages in PDF files by proposing steganography methods based on the Chinese Remainder Theorem, ensuring that the number of inserted A0 characters is less than the length of the secret message to maintain invisibility in common PDF readers.
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.