By JOHN SCHWARTZ The New York Times October 23, 2006
AMHERST, Mass. - They call it the "Johnny Carson attack," for his comic pose as a psychic divining the contents of an envelope.
Tom Heydt-Benjamin tapped an envelope against a black plastic box connected to his computer. Within moments, the screen showed a garbled string of characters that included this: fu/kevine, along with some numbers.
Mr. Heydt-Benjamin then ripped open the envelope. Inside was a credit card, fresh from the issuing bank. The card bore the name of Kevin E. Fu, a computer science professor at the University of Massachusetts, Amherst, who was standing nearby. The card number and expiration date matched those numbers on the screen.
The demonstration revealed potential security and privacy holes in a new generation of credit cards -- cards whose data is relayed by radio waves without need of a signature or physical swiping through a machine. Tens of millions of the cards have been issued, and equipment for their use is showing up at a growing number of locations, including CVS pharmacies, McDonald's restaurants and many movie theaters.
The card companies have implied through their marketing that the data is encrypted to make sure that a digital eavesdropper cannot get any intelligible information. American Express has said its cards incorporate "128-bit encryption," and J. P. Morgan Chase has said that its cards, which it calls Blink, use "the highest level of encryption allowed by the U.S. government."
But in tests on 20 cards from Visa, MasterCard and American Express, the researchers here found that the cardholder's name and other data was being transmitted without encryption and in plain text. They could skim and store the information from a card with a device the size of a couple of paperback books, which they cobbled together from readily available computer and radio components for $150.