Authentication system based on individual's memory

Touted as a "third authentication method" where the task of authentication is conducted not by machines or computers as with biometric or password systems, but rather within the human brain, the system comprises names of familiar friends or places, old photos, and sounds familiar to users themselves are registered in advance. When the system is used for authentication, registered data is mixed with decoy data, and users are prompted to choose correct answers in rapid succession.

The patent (US 7065786) is to Kai Corporation.