Q. The blowfish algorithm can be implemented on 16 bit processors.

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Q. What is the minimum size of the key in blowfish algorithm?

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Q. The blowfish algorithm’s key expansion converts a key of at most 448 bits into several subkey arrays totaling ___________ bytes.

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Q. Blowfish algorithm uses the Feistel Structure.

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Q. XOR and addition operations take place on bytes of size

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Q. How many S-boxes are present in the blowfish algorithm?

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Q. How many entries are present in each of the S-boxes present in the blowfish algorithm?

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Q. In blowfish, the keys are stored in the form of an array ranging from K1, K2 to Ki. What is the value of i?

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Q. To generate the sub-key P1 to P18 we use the hexadecimal equivalent digits of ____________

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Q. P17 gets XORed with

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Q. P15 gets XORed with

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

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

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

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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

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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

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

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

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

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

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