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Homework__1 - 3 A modern cipher is usually constructed as a...

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Homework #1 Due on Feb. 11, 2009 1. Why is the one-time pad encryption unconditionally secure against eavesdropping? 2. Why are simple substitution ciphers and transposition ciphers, even though extremely vulner- able to the frequency analysis attack, still in wide use in modern day encryption algorithms and cryptographic protocols?
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Unformatted text preview: 3. A modern cipher is usually constructed as a combination of several classical cipher techniques. Identify parts in the DES and AES where (i) substitution cipher techniques are used; (ii) transposition cipher techniques are used, and (iii) the Vernam cipher (can be found from the textbook) is used. 1...
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