History of intrusion detection

[Thomas <t531333 () pandora be>]

Hi,

I'm doing a little research on the history of id systems. The first 
paper i found introducing the concept of intrusion detection is from one 
James P. Anderson (1980) . Does any of you know about any older 
documents of this kind?

paper at http://seclab.cs.ucdavis.edu/projects/history/papers/ande80.pdf

Thanks,
Thomas

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