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CSE 651 Homework 1

# CSE 651 Homework 1 - The ciphertext “” was produced by...

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CSE 651 Homework 1 Due: Monday, April 12 by class time 1. Do Problem 2.5 of Stallings (4 th or 5 th edition). You only have to answer (a) and give the plaintext. (Hint: the encryption algorithm is one of those we have discussed in class.) 2. Do Problem 2.10 of Stallings (4 th or 5 th edition). 3. Do Problem 2.11 of Stallings (4 th or 5 th edition). (In part c, state a condition under which two Playfair matrices are equivalent (i.e., representing the same cipher).) 4. Do Problem 2.17 on the 5 th edition (or Problem 2.18 on the 4 th edition) of Stallings. 5.
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Unformatted text preview: The ciphertext “USAXCYKUSAPNUCOQMHIJESXKYHVS” was produced by a Vigenere cipher. What is the likely key length? 6. Vigenere cipher is a polyalphabetic cipher that uses multiple Cesar ciphers. Design a polyalphabetic cipher that uses multiple Playfair ciphers. 7. Do Problem 2.20 on the 5 th edition (or 2.21 on the 4 th edition) of Stallings. This question is about steganography. The key is a sequence of single-digit integers, namely 7, 8, 7, 6, 5, 6, 5, 4, … Hint: what do these single-digit integers indicate?...
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