1. (40 points) About Public Key Infrastructure (PKI (a) (5 points) Why do we need PKI? (b) (5 points) What important components does PKI consist of? (c) (5 points) Explain the concept of non-repudiation (d) (5 points) Give a taxonomy of PKI from an architecture perspective. (e) (5 points) Give a taxonomy of PKI from a certificate status management perspective. (f) (5 points) Explain how Certificate Revocation Lists (CRL) system works (g) (5 points) Explain
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