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Thank you for your valuable insights and recommendations. I genuinely appreciated both the suggested paper and your project, as they contributed to my learning. I completely agree that File Hider techniques have significant room for improvement in terms of seamlessly integrating the hidden data within the host file more organically. Regarding the session key, it is encrypted https://github.com/x011/File_Hider/blob/0f46058731d08c06a110....
Modern forensic analysis tools would be able to detect the high entropy encrypted data within the host file fairly easily. Additionally, the process of embedding the unencrypted session key, salt, file size, and then the encrypted data as a struct like you are would increase the detection of embedded data.
Half the battle is making sure the hidden data cannot be detected and the second is that the data cannot be read if detected. A more algorithmic approach to the embedding and extraction which uses properties of the host file to determine the relative locations of the session key, salt, file size, and data would likely better hide the presence of the embedded/encrypted data.
I recently made a novel implementation of, "An Image Steganography Algorithm using LSB Replacement through XOR Substitution (DOI:10.1109/ICOIACT46704.2019.8938486)" which you can find here: https://github.com/JustinPack/XOR_LSB_Stego
While my approach is a simple one lacking any inherent encryption, it could easily be added. I think you will find the paper a highly interesting read and it is also in my project.
Cheers and great work nonetheless.