Using recent (say, two years) publicized security incidents, give one example for each of the three kinds of threats (exposure of data, tempering with data, denial of service).

Describe the cause and cost, and any response from affected companies, then either suggest a policy to prevent a specific incident from happening, or a measure to limit the damage.

Find out which operating system is involved in each incident. How does that OS is designed to ensure each user can perform only authorized operations on authorized data, and how did that fail in that particular incident (it could be a system weakness or an operator error)?

Limit your answer to 300 words, you may use additional graph illustrations.