https://github.com/gromnitsky/zipography

Steganography with zip archives
https://github.com/gromnitsky/zipography

steganography

Last synced: about 6 hours ago
JSON representation

Steganography with zip archives

• Host: GitHub
• URL: https://github.com/gromnitsky/zipography
• Owner: gromnitsky
• Created: 2020-08-22T13:48:28.000Z (about 4 years ago)
• Default Branch: master
• Last Pushed: 2020-08-27T13:32:38.000Z (about 4 years ago)
• Last Synced: 2024-04-28T19:45:06.193Z (7 months ago)
• Topics: steganography
• Language: Ruby
• Homepage:
• Size: 78.1 KB
• Stars: 6
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

Awesome Lists containing this project

README

        
# Zipography

Steganography with zip archives: hide a blob of data within an

archive. For typical file archivers (7-zip, WinRAR, File Roller, &c) or

file managers (Windows Explorer), the blob is invisible.

    $ gem install zipography

Limitations:

* single blob only (but you can just add another .zip as a blob);

* doesn't work w/ zip64 files (this means ~4GB max for an archive+blob

  combo).

## How does it work?

A blob is injected after a file section right before the 1st *central

directory header*. After that, a pointer in an *end of central

directory* record is updated to compensate the shift of the *central

directory header*.



## Usage

Say we have a .zip that contains 2 files:

~~~

$ du orig.zip

12K     orig.zip

$ bsdtar tf orig.zip

The Celebrated Jumping Frog of Calaveras County.txt

What You Want.txt

~~~

Inject a picture into the archive:

    $ zipography-inject orig.zip blob1.png > 1.zip

(On Windows, use `-o 1.zip`, instead of a redirection.)

Is it visible? It isn't:

~~~

$ bsdtar tf 1.zip

The Celebrated Jumping Frog of Calaveras County.txt

What You Want.txt

$ du 1.zip

30K     1.zip

~~~

(`unzip -l` prints the same, but in a much verbose form.)

Check if we have the picture in the archive:

~~~

$ zipography-info 1.zip

Payload size:    18313

Adler32:         0x6812d9f

Blob version:    1

Valid:           true

~~~

Extract it:

~~~

$ zipography-extract 1.zip > 1.png

$ xdg-open !$

~~~



## License

MIT.