Can a hash value be secured

1 What is a message authentication code?

2 What is the difference between a message authentication code and a one-way hash function?

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3 In what ways can a hash value be secured so as to provide message authentication?

4 Is it necessary to recover the secret key in order to attack a MAC algorithm?

5 What changes in HMAC are required in order to replace one underlying hash function with another?

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