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TABLE 2-6
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Identify Assets Set Value of Asset Identify Risks Estimate Loss of Asset (formulas below) Calculate Probability: Simple Prob p(Event 1) p(Event 2) Prob of related Events p(Event 1) p(Event 2) p(Both Events) Calculate Cost of Loss: P (Financial Impact EL (Expected Loss) CP (corrected probability) EL corrected loss (CL) CM (cost of countermeasure) CL Net bene t of CM Cost of deductible net bene t CM Total cost avoidance
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People, equipment, etc Cost of replacement or loss of use What could cause a loss How to calculate Simple Probability
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Table 2-6 provides a snapshot of the seven steps to performing a risk analysis The checklist can be used as a guide to make sure the steps are all completed
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Choosing the Method to Mitigate the Risk
After the risks are identified you need to select a method to mitigate the risk The mitigation method we are talking about here is now whether to add an intrusion detection system The risk management program methods are as follows: Risk avoidance Risk reduction Risk segregation Risk acceptance Risk transfer (purchase insurance) Combinations of any of the above Table 2-8 is a synopsis of the risk mitigation methods Each method is outlined and a brief definition is included This is quick reference guide to risk mitigation Risk avoidance is when you cease doing or simply don t do something An example is not driving in a snowstorm because of the high risk of getting into an
Threat Assessment and Risk Analysis Basics
TABLE 2-7
ASSET
Asset Identi cation Table
DESCRIPTION OF ASSET, NUMBER, ETC
People Buildings Computers Intellectual Property Equipment
accident You simply avoided the risk by not driving in the snowstorm Businesses can choose to not do something that has a high risk or potential loss An example would be to not allow customers in a work area that is dangerous, like your local mechanic shop s garage while work is being performed Risk reduction is used to lower the severity of a potential or actual loss Fire sprinklers are a good example of risk reduction When a fire occurs in the facility, the fire sprinklers will activate, controlling or extinguishing the fire The fire sprinklers will limit the spread of a fire and therefore reduce the loss Risk segregation has two components First is the separation or spreading out of the activity to minimize the exposure An example is having a policy that all the top executives don t travel together on the same flight In the unlikely event the plane crashes, all the top executives are not lost in the single event Another example is to not locate a business or operation of the business in an area that is at high risk for causing a disruption, like placing the only data center of a company in an area prone to earthquakes To offset such a decision, a company would need to have an update disaster and business continuity plan that calls for a back up data center to be used in the event of the loss of the primary data center and to back up the critical company data regularly
TABLE 2-8
METHOD
Mitigation of Risk
DEFINED
Risk Avoidance Risk Reduction Risk Segregation Risk Acceptance Risk Transfer Combination
Avoid the risk Reduce the potential loss Separation/duplication Accept the risk Purchase insurance or self insure Any combinations of above
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Second is duplication or back up This is where you back up your company s critical data on a regular basis in case there is a server or disk failure Critical data can be identified as anything that is important to keeping the business running like accounts payable and receivable Other data such as orders, payroll, etc may also be needed to be backed up The backed-up data can be used to keep the business running (continuity) There are entire books written on the subject of disaster planning and business continuity and are beyond the scope of this book Another example is to have back up power for perimeter lighting so the facility will still have lights in the event of a power outage Risk acceptance is when the company management decides, after doing an analysis, that the potential loss from the risk is not significant and nothing needs to be done about it Risk transfer is when a company purchases insurance, thereby transferring the liability of the risk to the insurance company Companies pay an insurance premium to transfer the risk Premiums can be high so to offset the cost, there is a deductible The higher the deductible, the lower the premium We all do this and a common example is automobile insurance which transfers the cost of the liability to the insurance company If you are involved in an accident, the insurance company pays for the damages of your claim if the other motorist was uninsured and you are responsible for the deductible which is usually $50000 For companies the deductible can be as high as $250,000 or more, so using risk mitigation techniques is a good business financial consideration Businesses can also transfer the cost of the risk to an insurance company by purchasing a property and casualty policy The insurance company will not accept all of the risk and, in some cases, will not accept the risk at all There are deductibles that we have outlined in our automobile insurance policies and businesses also have deductibles for their property insurance These deductibles keep rates down As previously stated, it is not unheard of for a business to have a deductible of $250,000 or more for a loss experienced from a property casualty claim This is why the whole concept of risk analysis and mitigation is important to the business s bottom line Other risks that need to be considered are natural disasters such as tornados, hurricanes, blizzards, and earthquakes and the effect on the perimeter security Is there back-up power available How long will it keep critical systems operational There are combinations of the risk mitigation methods by using one or more of the five risk mitigation methods For example, you can transfer part of the risk and reduce the other part To transfer the risk you purchase insurance for part of the risk and then you implement a countermeasure for the other part of the risk For example the insurance company will only consider insuring the risk for part of its value for a burglary of computer equipment by only insuring the hardware
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