CRYPTO+Steganography
Encryption used: Modified bit-level columnar transposition method( see CRYPTO repo)
Steganography method: LSB
A file is encrypted, then hidden inside an image. If the image has a size of <3KB you can share it via the generated QR Codes and decode them via the app. Otherwise the QR Codes are not generated. The project has been successfully ported to the Android OS platform.
IEEE paper: https://doi.org/10.1109/CICN.2015.329