Steggy is a gRPC server for using steganography to encode hidden messages into PNG images!
Steganography is the practice of representing information within another message or physical object, in such a manner that the presence of the information is not evident to human inspection. In computing/electronic contexts, a computer file, message, image, or video is concealed within another file, message, image, or video.
[Wiki Source]
This project is a simple demonstration of gRPC, using a topic that I thought was fun and interesting. That's it. No "production" documentation and no long-term maintenance of this repo guaranteed.
If you think this project is neat and want to fork it and make your own twists, here are a few ideas to recommend:
- Create a standalone CLI instead of the server/client pattern
- Use gRPC bi-directional streaming to support HUGE images
- Support for video
- Support for ANY file type
Fun Fact: the image provided in this repo and shown above,
steggy.pngis in fact already encoded using steggy. Go ahead, try decoding it and find the hidden message for yourself!
To build steggy from source:
go build -o build/ ./...The final executables can now be found in the build/ directory.
To run the steggy server:
./build/serverFor example:
❯ ./build/server
2023/02/10 22:19:38 starting server on port 8080...
2023/02/10 22:19:38 server started on :8080
Once the server is running, you may use it to encode messages into a small PNG image, or decode a PNG image to extract the hidden message.
To encode a message into an image, use ./build/client -file <file> -msg <msg>:
❯ ./build/client -file steggy.png -msg 'Hello World!'
2023/02/10 22:21:37 connecting to steggy at 127.0.0.1:8080
2023/02/10 22:21:37 encoding message into steggy.png ...
2023/02/10 22:21:38 encoded image written: encoded_steggy.pngTo decode an image and get its hidden message, use ./build/client -file <file> -decode>:
❯ ./build/client -file encoded_steggy.png -decode
2023/02/10 22:20:14 connecting to steggy at 127.0.0.1:8080
2023/02/10 22:20:14 decoding message from encoded_steggy.png ...
2023/02/10 22:20:14 decoded: Hello World!