Cryptography Extra 2 (Block + Stream Ciphers)

Question 1

(block cipher) - key size 80-bits, block size : 64-bits, 32 rounds, unbalance Feistel, designed by NSA for the clipper chip

Answer 1

SKIPJACK

Question 2

(stream cipher) - key size 1-256-bits, up to 255 rounds

Answer 2

RCA

Question 3

(stream cipher) -2064 bit state size, 1-2048-bit key size, 1 round, weak cipher used in SSL & Web, Wifi Security, symmetric algorithm.

Answer 3

RC4 (symmetric algorithm)

Question 4

(stream cipher) - uses lagged Fibonacci pseudorandom number generator data stream XOR’ed w/the key.

Answer 4

FISH

Question 5

(stream cipher) - revised version of FISH to address known plaintext attack vulnerabilities, most widely used stream cipher.

Answer 5

PIKE

Question 6

symmetric algorithms

Answer 6

RC5 / RC6 (symmetric algorithms)