Radio-Factor Authentication: Identity Management over the 900MHz Band

Highly sensitive information systems need a simple and secure method of authentication. To supplement standard login procedures, we can implement multiple variations of two-factor authentication through radio waves, based on specific use cases. This allows us to enforce a proximity-based authentication system allowing for a physical separation of users at work and home. We can also ensure fine-grained access control for systems requiring a small number of privileged users. We will demonstrate two possible implementations, both using forms of public-key cryptography. The first scheme broadcasts a time-synchronized token to all available computers in a geographic area, and the second scheme uses public and private key pairs for digitally signed access request over-the-air.