H3.docx
Name:
Homework 3
Question 1 [7 pts]
Describe how a block cipher works by drawing a simple diagram showing all the components of the operation.
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Order Paper NowQuestion 2 [7 pts]
What is the codebook attack? Why this attack is feasible when 16 or 32-bit blocks have been used; but not feasible when 64-bit blocks have been used?
Question 3 [7 pts]
Describe two methods for constructing block ciphers. What is a round in block ciphers? How a slide attack is realized?
Question 4 [7 pts]
Compare EBC and CBC modes of operations? Why one should not use EBC? How the plaintext messages whose length is not a multiple of the block length is encrypted by using CBC?
Question 5 [7 pts]
Explain the Padding Oracle Attack.
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