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b'"ARPANET was established in 1968. In 1971, "creeper"programmed by Bob Thomas moved from computer to computer on ARPANET and displayed on each user\'s screen "I\'m the creeper. Catch me if you can!". Xerox PARC set up the ethernet in 1973 since researchers were interested in the concept of "distributed processing". They were testing programs whose function were to check other computers on a network to see if they were active. One of the programs became known as the Xerox worm. More than thirty years have passed since the dawn of distrubuted processing.\\n\\nSun Tzu, a Chinese philosopher wrote "When you know others, then you are able to attack them. When you know yourself, you are able to protect yourself."Or Bismarck, as prime minister of Prussia, said "Fools say they learn from experience; I prefer to learn from the experience of others."\\n\\nThis presentation considers "the day-after"and lessons learned.\\n\\nKatsuya Uchida graduated from the Department of Industrial Engineering, the University of Electro-Communications. He engaged in system development and user support at a small business computer dealer, a EDP auditing and a technical support of the electronic banking system at an American bank in Japan, and an implementation project of computer insurance and information security research and study at a major non-life insurance company in Japan.\\n\\nCurrently, he teaches "Information Security Management System"and "Hands-on Secure system"at the Institute of Information Security.\\n\\nMr. Uchida also works on "Education and Training Project for Information Security professionals", and "Research on Security and Reliability in Electronic Society"of the 21st Century Center of Excellence (COE) Program at Chuo University.\\n\\nHis main topics of research are "Information Security Management Systems", "Network Security", "Malicious Programs", "Information Forensics"and so on.\\n\\nMr. Uchida is a member of Computer Security Institute and a member of Information Processing Society of Japan."'