viscrypt

Simple tool for creating (2,2) visual cryptography schemes. These are described by various authors, first by Naor & Shamir (1994).

I've written this tool because the only other application I found online was a jar.

Usage

python3 viscrypt.py IMAGE_NAME

This will create two images, IMAGE_NAME_share1.png and IMAGE_NAME_share2.png.

Notes

• Pixel expansion is not handled in any way. Therefore the resulting shares will be twice the height of the original image.

• The produced shares have no transparency. Use tools like GIMP to turn the white pixels into transparent pixels.

• Your input image will be converted to black and white (not grayscale!) with dithering. Nevertheless you shouldn't try this with full colored images, their contrast will possibly be to low.

• I've only tested this with Python 3, Python 2 could work though.

License

MIT-License (see the LICENSE file for details).