Since the early 1990s, the U.S. Department of Defense has been worried about the threat posed to its myriad computer systems by malicious outside intrusion. Since 1995, DoD systems have been regularly attacked, up to 250,000 times a year, and only about one of every 50 attacks is detected and reported. This primer lays out the progress of the Defense Department’s response to the threat to its information networks.
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