***NEED TO ANSWER the below questions (minimum 100 words per each answer)

**** Need it by 11/07/2019 6 PM EST****

SUBJECT: Network Security

APA Format NEEDED

NO PLAGIARISM

***NEED TO ANSWER the below questions (minimum 100 words per each answer): 

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