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Question:
(a) Distinguish between Steganograhy and Cryptography.
(b) "Playfair cipher is more secure than Monoalphabetic cipher." Justify this statement.
(c) Various applications compress data before sending it across a network. If compression and encryption are both to be applied to a document before it is transmitted, does it matter which is done first? Why?
(d) A compressed data file has many of the attributes of an encrypted data file. In what way are they similar? Is compression a form of encryption, or could it be used as such? Why, or why not?
(e) Describe Triple DES. Is it secure? Why is it not the standard replacement for DES?
(f) Give two examples of passive attacks.
(a) (i) Bob has public RSA key (n = 77, e = 7). Show that Bob's private key is (d = 43). (ii) Alice wants to send the message m = 13 to Bob. She encrypts the message usi
VULNERABILITY SCANNERS Active vulnerability scanners scan networks for detailed information, it initiate traffic to determine security holes. This scanner identifies usernames a
Transposition technique
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Question 1: (a) Explain the operation of the "matchmaker" middle agent. (b) Describe why broker middle agents are more efficient in terms of the time taken for a service to
You are provided with 3000 sample keystrokes for 5 users mentioned above. You can find this data using the ‘Lab 2 User Data' link in the ‘Lab 2' folder on Blackboard. Please note t
Asymmetric Encryption Asymmetric encryption method makes use of two different but related keys and either key can be used to encrypt or decrypt the message. This method is freque
Code to implement Otway-Rees Key Exchange Protocol
Question: a) There are two basic approaches to dealing with errors in the presence of pipelining. One way is Go-Back-N and the other strategy is Selective Repeat. i. Explain
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