Question Description
I’m studying and need help with a question to help me learn.
- 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
Explanation & Answer
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Running head: QUESTIONS
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QUESTIONS
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3.1. The three methods needed in message authentication are:
o The use of conventional encryption – changes the plain text into cipher text.
o The use of public-key encryption – uses two mathematically related keys.
o Use of the secret key.
3.2. The message authentication code (MAC) is the same as the cryptographic hash, but it is
founded of a secret key. It refers to a block of a few bytes necessary to authenticate a message.
The block can be checked by the re...
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