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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.
Size of Option field of an ip datagram is 20 bytes. What is the value of HLEN? What is the value in binary?
(a) Describe DES encryption with a block diagram and brief steps. (b) How does triple DES improve security. What is the effective key length of triple DES? How can 3DES be compa
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