Awesome
Here you can find the source for the Card Security Device app.
Playstore link: https://play.google.com/store/apps/details?id=net.davidgf.bankcap
This app allows users to use their Cards, Card reader and Phone/Tablet/Android Device to generate challenge responses so that they can login in online banking, do transactions, etc. So far the project works well for Postfinance using a USB reader (tested with ACR38U).
Still investigating how to improve it, since it seems to fail for other models such as ACR39U for some unkown reason.
Feel free to contribute any patches, test your bank, etc!