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This 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.
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.
"These are puzzles that are easy for a human to solve, but hard for a computer to solve, even if it has the random bits used to generate the puzzle," said Jeremiah Blocki, a Ph.D. student in computer science who developed GOTCHAs along with Manuel Blum, professor of computer science, and Anupam Datta, associate professor of computer science and electrical and computer engineering.
  The Computer Prayer  
   Our Morning Prayer . . .

   Our Hard Drive

   Which art internal

   Volume C by name;

   Windows a virus?
1. Viruses replicate quickly.
Windows does this.

2. Viruses use up valuable system resources, slowing down the system as they do so.
Windows does this.
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