Provide detailed responses to the following
1 List three approaches to message authentication.
2 What is a message authentication code?
4 What properties must a hash function have to be useful for message authentication?
5 In the context of a hash function, what is a compression function?
6 What are the principal ingredients of a public-key cryptosystem?
7 List and briefly define three uses of a public-key cryptosystem.
8 What is the difference between a private key and a secret key?
9 What is a digital signature?
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