. . . Charles C. Tappert, a professor of computer science at Pace University, has also conducted research on the keystroke biometric, verifying identities by looking at the way students type their answers to questions on online tests. His research group has developed software that analyzes the distinctive pattern of keyboard pressure; it accurately confirms the claimed identity of a test taker in 99.5 percent of cases, he says.
The situations that Darpa has in mind would require a system that quickly authenticates the user, without waiting to collect data on hundreds of keystrokes. But Professor Tappert says that an intruder’s movement within an internal network would show telltale irregularities and that his software would be able to detect them.
Read the article in the New York Times.