Answer all below question with in 300 words combined(excluding questio
QUESTION
Answer all below question with in 300 words combined(excluding questions). 3.1 List three approaches to message authentication. 3.2 What is a message authentication code? 3.4 What properties must a hash function have to be useful for message authentication? 3.5 In the context of a hash function, what is a compression function? 3.6 What are the principal ingredients of a public-key cryptosystem? 3.7 List and briefly define three uses of a public-key cryptosystem. 3.8 What is the difference between a private key and a secret key? 3.9 What is a digital signature?
ANSWER:
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