Lecture2.pptx - Threats Threat Agents and Threat Modelling...

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edithcowancollege.edu.au navitas.com Threats, Threat Agents and Threat Modelling Computer Security
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edithcowancollege.edu.au navitas.com What is a Threat? An entity likely to cause damage or danger An act designed to obtain a negative response
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edithcowancollege.edu.au navitas.com What is a Vulnerability? A flaw or weakness in the design, implementation, or operation of a system How open something is to an attack Threats act on or exploit vulnerabilities
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edithcowancollege.edu.au navitas.com Risk Management
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edithcowancollege.edu.au navitas.com Risk Assessment Risk is the likelihood of the occurrence of a vulnerability multiplied by the value of the asset minus the percentage of risk mitigated by current controls plus the uncertainty of current knowledge of the vulnerability
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edithcowancollege.edu.au navitas.com Risk control strategies Defence – apply a safeguard to reduce the risk Mitigate – plan to make risk outcome less severe Accept – accept the outcome of an exploitation Transfer – shift the risk to other assets, processes or organisations (insurance) Terminate – remove an asset from the environment
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edithcowancollege.edu.au navitas.com Instinctive Risk Assessment We perform an instinctive risk assessment everyday We automatically attempt to assess the risk involved with the things that we do When crossing a busy road we automatically perform an instinctive risk assessment But an ‘instinctive’ risk assessment has its limitations and could increase our threat exposure
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edithcowancollege.edu.au navitas.com Real Vs Perceived Risk During the period of the Washington Sniper many parents elected to drive their children to school believing this to be the safest course of action Bruce Schneier argued that the probability of everyone in the car dying in a traffic accident was greater than any one of them being killed by the Washington Sniper
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edithcowancollege.edu.au navitas.com Real Vs Perceived Risk Shoppers will worry about E. coli bacteria on spinach leaves but fill their shopping cart with fatty foods People worry about traveling in a plane yet on a global level more people die in car accidents
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edithcowancollege.edu.au navitas.com Risk Perception “I don’t earn over $40,000 a year so I will not be a victim to internet crime so I do not need to use security software” “You have to use the Internet everyday to be attacked online”
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edithcowancollege.edu.au navitas.com Contingency Planning (CP) A CP is used to anticipate, react to, and recover from events that threaten information assets, it involves; A business impact analysis (BIA) Incident response plan (IRP) Disaster recovery plan (DRP) Business continuity plan (BCP)
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edithcowancollege.edu.au navitas.com Business Impact Analysis The BIA takes up where the risk assessment process leaves off The BIA provides detailed scenarios of the potential impact each attack could have on an organisation
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