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Imagine a peer-to peer network where 1000 users want to communicate in an authenticated and confidential way without a central Trusted Third (TIP).

1. How many key are collectively needed , if symmetric algorithms are deployed?

2. How are these number changed , if we bring in a central instance (key Distribution center , KDC)?

3. What is the main advantage of a KDC against the scenario without a KDC ?

4. How many keys are necessary if we make use of asymmetric algorithm ?

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