Cryptographic systems and methods that allow secure connection of two devices over an open network, using passwords communicated in an out-of-band process. One-time versus static passwords, active versus passive models of user participation, and different combinations of password-input and password-output...http://www.google.com/patents/US20040073795?utm_source=gb-gplus-sharePatent US20040073795 - Systems and methods for password-based connection
