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Did you manually implement the jpeg file format? How did you get it to save without jpeg compression overwriting your bits? I'm working on a similar project htt

Did you manually implement the jpeg file format? How did you get it to save without jpeg compression overwriting your bits? I'm working on a similar project https://github.com/smchughinfo/steganographyjr https://github.com/smchughinfo/steganographyjr but so far only png files work. I think it would be nice to manually implement gifs and jpegs but they are not easy algorithms and I suspect there are multiple flavors of each so it just seems like a huge undertaking. ...i will probably try ImageSharp https://github.com/SixLabors/ImageSharp https://github.com/SixLabors/ImageSharp

nemo1618 8y ago
I copied most of the implementation from the Go standard library. The actual diff required to implement the steganography is very small: https://github.com/lukechampine/jsteg/commit/d35a0bb4e6c545d4f1dd2a28eee514228dab3409 https://github.com/lukechampine/jsteg/commit/d35a0bb4e6c545d... Re-encoding the JPEG will destroy the hidden bits, so it's very fragile.
- emmelaich 8y ago
  You can make it less fragile with a significant loss of bandwidth.