A good summary of ethical properties in regards to active defense
Col. Cabana argues that in an information war, the military should only play a support role to civilian entities
Col. N. C. Cabana, "Cyber Attack Response: The Military in a Support Role," vol. 2005: http://www.airpower.maxwell.af.mil/airchronicles/cc/cabana.html, 2000.
Paul Joyal discusses the history of espionage with respect to industrial espionage and the upcoming threat of information warfare against a nation's economic infrastructure and intellectual property
P. M. Joyal, "Industrial Espionage Today and Information Wars of Tomarrow," presented at 19th National Information Systems Security Conference, 1996.
The state of security on the Internet is bad and becoming worse. One reaction to this state of affairs is a behavior termed "Ethical Hacking" which attempts to proactively increase security protection by identifying and patching known security vulnerabilities on systems owned by other parties. Ethical hackers may beta test unreleased software, stress test released software, and scan networks of computers for vulnerabilities.
Attorney General's Office asks Congress for more lenient statutes in regards to tracking network traffic along multiple phone networks (currently must get seperate warrants for each phone network)
Article on Symbiot's IDS
An article on vigilantism in response to security threats (some include physical responses - baseball bats)
Jayawal, Yurcik, and Doss discuss the possibility of using hack-back
V. Jayawal, W. Yurcik, and D. Doss, "Internet Hack Back: Counter Attacks as Self-Defense or Vigilantism?" presented at International Symposium on Technology and Society, Raleigh, North Carolina, 2002.
Discusses information warfare possibilities from North Korea into Australia and other countries
Discusses meeting at SRI to discuss security vulnerabilities in networks