Installing cyber defenses is a desirable but incomplete response to hacking attacks on Israeli websites, a leading internet security authority said on Thursday. Proessor Maj.-Gen. (res.) Yitzhak Beb-Israel, Chairman of the National Council for Research and Development, spoke at a cyber warfare session held by the Science and Technology Ministry at the Herzliya Conference. Comparing defensive cyber measures to the placing of security guards around restaurants to prevent terrorist attack, Ben-Israel said, "It isn't enough, we have to reach the source of those who plan [the attacks] and send the attackers."Ben-Israel said cyber threats had the potential to harm physical targets such as electricity assets, stressing that online strikes are merely a "technique."