Question: 1. Explain the Kerckhoffs's principle. 2. What is the difference between known plaintext attack and chosen plaintext attack? 3. a) How is the checksum we

1. Explain the Kerckhoffs's principle.

2. What is the difference between known plaintext attack and chosen plaintext attack?

a) How is the checksum we find in the UDP, and TCP header calculated? b) Is this checksum considered sufficient to ensure message integrity? Justify your answer.

a) Can two different messages produce the same cryptographic hash? Justify your answer. b) Why is it not possible to decipher a hash of a message to get back the original message?

a) What is the de facto e-mail encryption scheme? b) What does it use for authentication and message integrity?

a) What is the purpose of the random nonces in the TLS handshake? b) And how do they achieve this purpose?

7. Is there a fixed encryption algorithm in TLS?

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