(Business 2.0) -- Electronic fingerprinting devices may account for half of the $1 billion biometric security market, but they can be thrown off by a mere scratch on your finger. IDesia, a two-year-old startup based in Caesarea, Israel, has a better idea: Use the unique electrical signals we all carry around in our bodies. The only thing that will prevent IDesia's scanners from reading them is if you're having a heart attack. Even better, IDesia's sensor costs manufacturers $1, compared with $6 for a fingerprint scanner. "It looks like very promising technology," says Raj Nanavati, a partner at the International Biometric Group, an independent analyst firm. Up next: an IDesia smartcard for secure credit transactions, set for release in 2008. By then the biometric market will have hit $3.2 billion, according to Frost & Sullivan--and IDesia expects to have its fingerprints all over it.

1 A user places any two fingers from both hands on the sensor for just a few seconds; the thumb-size touchpoints can be attached to a computer, cell phone, or PDA for a mere $1.

2 The technology recognizes the user based on his electrophysiological signals--in other words, the unique current generated by his brain activity, heartbeats, and central nervous system.

3 The user is now permitted to access his laptop.