Internet's Anonymity Makes Cyberattack Hard to Trace

It is an axiom that on the Internet nobody knows that you are a dog. By the same token, it is all but impossible to know whether you are from North Korea or South Korea. That puzzle is plaguing law enforcement investigators in several nations who are now hunting for the authors of a small but highly publicised Internet denial-of-service attack that briefly knocked offline the Web sites of some United States and South Korean government agencies and companies