What is the importance of using digital certificates, Basic Computer Science

QUESTION

a) Cryptography is a set of techniques and mathematical algorithms. Describe four important areas where cryptography must be applied

b) What is the importance of using digital certificates?

c) Describe in detail about how security is implemented at the "access level" and the "call control level". Support your answer using a diagram

d) Describe the role "split gatekeeper architecture"

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