Cyber Attacks: Removing Roadblocks to Investigation and Information Sharing : Hearing Before the Subcommittee on Technology, Terrorism, and Government Information of the Committee on the Judiciary, United States Senate, One Hundred Sixth Congress, Second Session, on Examining the Incidence of Cyber Attacks on the Nation's Information Systems, Focusing on Removing the Roadblocks to Investigation and Information Sharing, March 28, 2000