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John Parish likes to stay as busy as a yellow jacket. When he's not in class or researching quantum cryptography, he's building a robotic sub or working for the Department of Defense as part of Georgia Tech's cooperative education program. As Tech's newest recipient of the national Barry Goldwater Scholarship, all his hard work seems to be paying off.
"John is the caliber of undergraduate student who comes along only once or twice in an advisor's career," said Steven McLaughlin, professor of electrical and computer engineering and director of Georgia Tech Lorraine in Metz, France. "He is certainly the best undergraduate student I have worked with in my twelve years of teaching and research."
When Parish was in middle school and high school, several people told him he'd never make it in college, especially in any field that was math or science related.
Now, he's working with McLaughlin on developing a method for encrypting communications that will be able to withstand the growing power of computers to crack them.
"A lot of the cryptographic methods in use now are still based on computational complexity," Parish said. "If someone develops a quantum computer, you'd be able to break virtually any cryptographic protocol that's based on computational complexity."
One of the potential benefits of quantum cryptography is that an eavesdropper would be easily detected because the very act of listening causes changes in the encoded bits.
But serious challenges remain before it can be used reliably. It's currently very difficult to establish wireless communication between two parties if the receiver's location is unknown. It is also difficult to communicate with more than one party at a time.
Parish's research could provide a solution.
Suppose Agent Base wants to send a secret message to Agent Field, who's in an undisclosed secret location. Base sends out a reference signal - comprised of many photons - in all directions. Field receives the signal and uses a device to reduce it to just one photon, which he encodes with a secret quantum key the two will use to decode their messages. He sends that photon back to Base, who measures it in order to find out the secret key. Base and Field can now communicate using the key to code and de-code their messages.
This method eliminates the need for Field to wear a tracking device, which could also be used by opposing agents. It also allows other agents that Base wants to talk with to receive the reference signal and beam back their own keys to Base.
"Using this you'll be able to have a multi-user free space system. The concept is totally new," said Parish. | 