International Association for Cryptologic Research
Physical authentication brings extra security to software authentication by adding real-world input to conventional authentication protocols. Existing solutions such as textual and graphical passwords are subject to brute force and shoulder surfing attacks, while users are reluctant to use biometrics for identification, due to its intrusiveness. This paper uses hamiltonian tokens as authentication means. The proposed token structure offers many possible configurations (i.e., passwords) and is small enough to be carried on a physical key-chain. After presenting the authors' general idea, they describe an efficient algorithm to produce these tokens.