The fourth pillar is response. There will come a time when controls prove less than effective for a situation, and systems become unavailable, or data confidentiality or integrity is compromised. Business continuity and disaster recovery plans establish procedures for data resiliency to maintain systems at an organizationally-mandated availability level. If the company can only tolerate five minutes of downtime a year, systems will need to be put in place to stay operational when components, sites, software, power, or other pieces of the system fail. Additionally, maintenance activities will need to be constructed in such a way as to preserve availability.
Similarly, loss of data confidentiality through a data breach or other unauthorized disclosure or the loss of data integrity through an attack such as ransomware will require some response effort. Incident response includes investigating the incident, containing the situation, assessing the impact, notifying impacted individuals, restoring data, and remediating the issues leading to the root cause. Response efforts are far more reliable and less costly when there is an associated plan. Generally, the more refined the plan, the more effective the response.
Communication plans should also be developed for possible situations. Communication plans clearly identify what will be said, who will say it, which customers, partners, employees, or governing bodies will be notified, and appropriate channels to use. Organizations lacking a communication plan may find employees talking to the press or customer notifications sent out too early or too late or without a clear explanation. Recent breaches only serve to demonstrate the value a defined communication plan can have on customer perceptions, stock value, regulatory fines, and liability.
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