Question: INTERNET AND INFORMATION SECURITY SECTION A: ANSWER ALL THE QUESTIONS. EACH IS WORTH 5 MARKS Q1. Callie wants to send the message M = 13

INTERNET AND INFORMATION SECURITY

SECTION A: ANSWER ALL THE QUESTIONS. EACH IS WORTH 5 MARKS Q1. Callie wants to send the message M = 13 to Alice. Using Alice's public and private keys, calculate the ciphertext C, and the value for Rwhen Alice recovers the message Use 11 and 3 as the initial prime numbers for p and q respectively to calculate Alice's public and private keys [20 marks Q2 A. Firewalls use Access Control Lists (ACL). Explain what is meant by an ACL and typical contents. B. Explain what is meant by the term "salt in relation to cryptography. You should discuss how it is used to make it more difficult to crack passwords. [20 marks) Q3. A. Explain what is meant by a digital signature and describe how it is generated. B. The permission associated with a program called Program and a dataset called Datal are as follows: Program 1:755 Datal: 742 State the permissions given in bits to the owner, the group and the others. [20 marks Q4. A. Dexter wants to set up his own public and private keys. He chooses p= 23 and q = 19 with e = 283. Find d so that ed has a remainder of 1 when divided by (p-1) (-1) B. Explain the difference between HTTP and HTTP protocol [20 marks]

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