CS172-CS283 Quiz 2 - Final - Answerkey - 20090929

CS172-CS283 Quiz 2 - Final - Answerkey - 20090929 -...

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Unformatted text preview: CS172‐CS283 Quiz 2 Answer Key ‐ 20090929 1. keystream 2. A block cipher works on blocks of fixed size whereas a stream cipher works on variable length bit streams. 3. A block cipher works on binary plaintext and ciphertext digits (bits) whereas a classical cipher works on natural language plaintext and ciphetext symbols 4. 24 5. Both algorithms use Fixed Size Input blocks Both algorithms make use of Multiple Rounds Both algorithms make use of S‐Boxes 6. AES supports multiple cipher key sizes (3) whereas DES only supports 1 AES cipher key sizes are all larger than the DES cipher key size AES rounds include a step called mixcolumns which is a kind of operation that is not used in DES. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. A random number Keystream RC4 or Rivest Cipher 4 Man‐in‐the‐middle Attack 14 and 10100 128 bits 3 128 bits, 192 bits, 256 bits 6 and 4 Confidentiality, Integrity 17. AES 18. Integrity 19. 19.1. 19.2. 19.3. plaintext = m mod(n) a*b = 1 mod(Ø (n)) b ciphertext = m mod(n) a CS172‐CS283 Quiz 2 ‐ 20090929 Page 1 ...
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