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# Tutorial3 - SCR3443 Tutorial 3 CLASSICAL CRYPTOGRAPHY 1...

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SCR3443 Tutorial 3: CLASSICAL CRYPTOGRAPHY 1. Alice often needs to encrypt plaintext made of both letters (a z) and digits (0 9). a. If she uses additive cipher, what is the key domain? What is the modulus? b. If she uses multiplicative cipher, what is the key domain? What is the modulus? c. If she uses affine cipher, what is the key domain? What is the modulus? 2. Suppose that spaces, periods and question marks are added to the plaintext to increase the key domain of simple ciphers. a. What is the key domain if an additive cipher is used? b. What is the key domain if a multiplicative cipher is used? c. What is the key domain if an affine cipher is used? 3. In each of the following ciphers, what is the maximum number of characters that will be changed in the ciphertext if only a single character is changed in the plaintext? a. Additive b. Multiplicative c. Affine d. Vigenere e. Auo-key f. One-time pad 4. In each of the following ciphers what is the maximum number of characters that will be changed in the ciphertext if only a single character is changed in the plaintext?
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• Winter '16
• Cryptography, decryption key, multiplicative cipher

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