Q. P17 gets XORed with

View solution

Q. P15 gets XORed with

View solution

Q. What is the number of iterations required in total to generate all the sub-keys in blowfish?

View solution

Q. A single blowfish s-box converts 8-bits to _________ bits.

View solution

Q. The 32bit output of s-box 1 is XORed with s-box 2.

View solution

Q. Which of the following statements are true with respect to the blowfish algorithm –

i) Provided key is large enough, brute-force key search is not practical, especially given the high key schedule cost
ii) Key dependent S-boxes and sub keys make analysis very difficult
iii) Changing both halves in each round increases security
iv) Blowfish has improved avalanche effects

View solution

Q. Which of the following is true for the RC5 algorithm?

i) Has variable number of rounds
ii) Has fixed Key length
iii) High memory Requirements
iv) Uses only primitive computational operations commonly found on microprocessors

View solution

Q. What are the allowable values of word size in bit for RC5 algorithm?

View solution

Q. The number of rounds in RC5 can range from 0 to _____________

View solution

Q. The standard/nominal version of the RC5-w/r/b has parameters w/r/b as

View solution

Q. The total number of subkeys t used in the RC5 algorithm is given by the formula (r corresponds to number of rounds)

View solution

Q. RC5 uses 2 magic constants to define their subkeys. These are

View solution

Q. The value of the base of natural logarithms is

View solution

Q. The value of the golden ratio is

View solution

Q. Calculate the number of subkeys required in RC5 for 18 rounds of computation.

View solution

Q. RC5 encryption uses Right shift and decryption uses Left shift.

View solution

Q. “RC5 uses the Feistel Structure.”

View solution

Q. Which one of the following is not a RC5 mode of operation?

View solution

Q. Which RC5 mode will have the ciphertext longer than the plaintext by at most the size of a single RC5 block?

View solution

Q. Which of these is not a characteristic of block ciphers?

View solution