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midterm review

# midterm review - Section 5 Midterm Review 1 What is the...

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Section 5: Midterm Review: 1: What is the creature pictured below? 2. Encode the message from the picture above using a rail-fence cipher. 3. What is the difference between a Caesar Shift Cipher and a Monoalphabetic Substitution Cipher with a Keyword? 4. What is a code? What is a Nomenclator? How are they related?

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5. Describe a Book Cipher. 6. How would you go about breaking a Vigenère cipher? 7. Draw the mappings for a Monoalphabetic Substitution Cipher, a Monoalphabetic Substitution Cipher with Homophones, and a Polyalphabetic Cipher: 8. Convert the following decimal numbers into binary: i) 99 = ii) 203 = iii) 55 = 9. Convert the following binary numbers into decimal: i) 11111110111 = ii) 1111010101 = iii) 12111111 = 10. Do the following binary operations: 11111011111101 111 + 11111101101101 x 11 11. Binary Transposition Cipher: Encipher the following message by swapping the first and second, third and fourth, fifth and sixth, and seventh and eighth digits: 10101101 ____________________________
12. Binary Substitution Cipher: Use the resulting ciphertext above as a key to encipher the

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