On achieving a digital identity management system with support for non-transferability

In this work, we study the use of digital credentials in an online digital identity management setting. We focus on the problem of users sharing their digital credentials with one another, a problem called the “transferability” or “lending” problem. Further, we present the detailed mathematics showing how non-transferability can be achieved through biometrics. By tying the physical identity of a user to their digital identity, we are better able to prevent users from sharing their credentials. Additionally, we extend our non-transferable digital identity management scheme by introducing a high-powered proxy. Our proxy is able to off-load the number of required computations from a user who is possibly accessing our system with a low-powered hand-held device.