The KerPass card application is the most visible part of the ongoing KerPass UST R&D effort which goal is to simplify the use of public key cryptography to protect personal assets.
The Card application allows its users to create a non limited number of "cards". Each card corresponds to an external context of use (eg Web application, Physical access control...) and embeds a dedicated public/private keypair.
To ease transferring the cryptographic messages required to operate a certain card, the application makes efficient uses of well known smartphone interfaces :