US grapples with how to retaliate in cyber attacks

[AP] In the murky world of computer espionage, the U.S. faces hard choices on how to retaliate when government or privately owned networks come under cyber attack, senior military and intelligence officials said Tuesday.As the administration grapples with how best to defend its computer networks, debate is raging over how far the U.S. can go in pursuit of cyber criminals, and even what constitutes a digital act of war.
http://www.washingtonpost.com/wp-dyn/content/article/2009/06/02/AR2009060203037.html