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Active and passive security threats

What is the difference between active and passive security threats?
List and briefly define 3 categories of passive and active security attacks.
List and briefly define at least 3 categories of security services.
List and briefly define at least 3 categories of security mechanisms.
Create a matrix highlighting the relationship between the security services and the mechanisms listed in questions 3 and 4. Place services to the left (vertically), the mechanism to the right (horizontally), then place an X for the applicable mechanisms to the services.
What are the essential differences of a symmetric cipher?
How many keys are required for two people to communicate via a symmetric cipher?
What is triple encryption?
List ways in which secret keys can be distributed to two communicating parties.
What are the fundamental differences between AES, DES, and 3DES?

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