Carnegie Mellon University computer scientists have developed a password system that incorporates inkblots in the password security process.

The new type of password, dubbed a GOTCHA (Generating panOptic Turing Tests to Tell Computers and Humans Apart), would be suitable for protecting high-value accounts, such as bank accounts, medical records and other sensitive information, say the researchers.

To create a GOTCHA, a user chooses a password and a computer then generates several random, multi-colored inkblots. The user describes each inkblot with a text phrase. These phrases are then stored in a random order along with the password. When the user returns to the site and signs in with the password, the inkblots are displayed again along with the list of descriptive phrases; the user then matches each phrase with the appropriate inkblot.

The research was supported by the National Science Foundation and the Air Force Office of Scientific Research.

[Image courtesy: Carnegie Mellon]