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From: purdy at tecman.com (Curt Purdy) Subject: [inbox] ROSI n30 wrote: > Any good links/pointers to ROSI (Return on security investment)? Here's what I've got: ROSI A classic argument is that there is similarly no clear return on life insurance, but that doesn't stop most of us from buying it; still, attempting to formulate operational-security ROI may be a lost cause. Assign values to everything from tangible assets (measured in dollars with depreciation taken into account) to intangible assets (measured in relative value, for example, software A is three times as valuable as software B). Different types of hacks were assigned costs according to an existing and largely accepted taxonomy developed by the Department of Defense. Annual Loss Expectancy (ALE) was figured. ALE is an attack's damage multiplied by frequency. Determining cost-benefit (R-E) + T = ALE R-ALE = ROSI R =the cost per year to recover from an intrusion E = the savings gained by stopping the intrusion T = the cost of the intrusion detection tool ALE = the Annual Loss Expectancy ROSI = Return On Security Investment www.csds.uidaho.edu/director/costbenefit.pdf
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