One of the trickiest problems in cyber security is trying to figure who’s really behind an attack. Darpa, the Pentagon agency that created the Internet, is trying to fix that, with a new effort to develop the “cyber equivalent of fingerprints or DNA” that can identify even the best-cloaked hackers.

http://www.wired.com/dangerroom/2010/01/pentagon-searches-for-digital-dna-to-identify-hackers/

-Urs