Describe two methods for constructing block ciphers

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Reference no: EM133509660

Problem A. Describe how a block cipher works by drawing a simple diagram showing all the components of the operation.

Problem B. 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?

Problem C. Describe two methods for constructing block ciphers. What is a round in block ciphers? How a slide attack is realized?

Problem D. 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?

Problem E. Explain the Padding Oracle Attack.

Reference no: EM133509660

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