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Cryptography and Network Security: Block Ciphers & Public Key Cryptography
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Cryptography and Network Security: Block Ciphers & Public Key Cryptography
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25 Questions

1. Calculate the number of subkeys required in RC5 for 18 rounds of computation.
2. Which one of the following is not a cryptographic algorithm- JUPITER, Blowfish, RC6, Rijndael and Serpent?
3. A process of making the encrypted text readable again.
4. ElGamal encryption system is __________
5. Which of the 4 operations are false for each round in the AES algorithm
i. Substitute Bytes
ii. Shift Columns
iii. Mix Rows
iv. XOR Round Key
6. In RC5, the initialization operations makes use of magic constants defined as follows: P_w=Odd[(e-2) 2w]. Q_w=Odd[(φ-1) 2w]. What is the hexadecimal value of Pw for word size of 16 bits?"
7. The Initial Permutation table/matrix is of size
8. Like DES, AES also uses Feistel Structure.
9. How many keys does the Triple DES algorithm use?
10. What is the minimum size of the key in blowfish algorithm?
11. RC5 uses 2 magic constants to define their subkeys. These are
12. In cryptography, the order of the letters in a message is rearranged by __________
13. Cryptanalysis is used __________
14. Using Linear Crypt-analysis, the minimum computations required to decipher the DES algorithm is
15. The DES Algorithm Cipher System consists of ____________rounds (iterations) each with a round key
16. Which one of the following is a cryptographic protocol used to secure HTTP connection?
17. An algorithm used in encryption is referred to as cipher.
18. In encryption, which of the following is the best text encoding technique?
19. The protocol designed to make the security of wireless LAN as good as that of wired LAN.
20. Blowfish algorithm uses the Feistel Structure.
21. Using Differential Crypt-analysis, the minimum computations required to decipher the DES algorithm is
22. In AES the 4×4 bytes matrix key is transformed into a keys of size __________
23. Cryptographic hash function takes an arbitrary block of data and returns _________
24. If there are 256cipher texts per plain text and a total of 218plaintexts of length 18 exists. Then determine the number of distinct ciphertexts?
25. In RC5, the initialization operations makes use of magic constants defined as follows: P_w=Odd[(e-2) 2w]. Q_w=Odd[(φ-1) 2w]. What is the hexadecsimal value of Qw for word size of 32 bits?"

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