The Cliff Stoll intrusions scare the government, military, and universities supporting gov and mil research. Lawrence Livermore National Lab funds three security projects at UC Davis by supporting the Prof Karl Levitt’s computer science lab. 1991: While instrumenting a DISA location suffering from excessive bandwidth usage, NSM discovers 80% of the clogged link is caused by intruder activity. 1992: Former FBI Director, then assistant AG, Robert Mueller writes a letter to NIST warning that NSM might not be legal.”]
Source: https://taosecurity.blogspot.com/2014/09/a-brief-history-of-network-security.html