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problemsome archeologists found a new script written in an unknown language the archeologists later found a small
problem1 list three mono alphabetic ciphers2 list three polyalphabetic ciphers3 list two transposition ciphers4 list
problem1 distinguish between a stream cipher and a block cipher2 are all stream ciphers mono alphabetic explain3 are
problem1 define a symmetric-key cipher2 distinguish between a substitution cipher and a transposition cipher3
problem1 if the key with parity bit 64 bits is 0123 abcd 2562 1456 find the first round key2 using a plaintext block of
problem1 prove the sixth design criteria for p-boxes by checking the destination of an arbitrary s-box2 prove the
problem1 check the fifth design criterion for s-box 4 using the following pairs of inputsa 001100 and 110000b 110011
problemgive a general fondle to calculate the number of each kind of transformation sub-bytes shift-rows mix-columns
problem1 what is the block size in des what is the cipher key size in des what is the round-key size in des2 what is
problem1 how many permutations are used in a des cipher algorithm how many permutations are used in the round-key
problem1 why does the round-key generator need a parity drop permutation2 what is the difference between a weak key a
problem1 show how the eight design criteria for s-box 7 are fulfilled2 prove the first design criterion for p-boxes by
problem1 draw the table to show the result of passing 000000 through all 8 s-boxes do you see a pattern in the outputs2
problemprove that the shift rows and in v shift rows transformations are permutations by doing the followinga show the
problem1 abs has a larger block size than des 128 versus 64 is this an advantage or dis-advantage explain2 aes defines
problemin a cipher s-boxes can be either static or dynamic the parameters in a static s-box do not depend on the keya
problem1 compare the round keys in des and aes in which cipher is the size of the round key the same as the size of the
proble1 compare the substitution in des and aes why do we have only one substitution table s-box in aes but several in
problem1 define a state in aes how many states are there in each version of aes2 which of the four transformations
problem1 list the criteria defund by kist for aes2 list the parameters block size key size and the number of rounds for
problem1 write the decryption algorithm pseudo code for cfb mode2 write the decryption algorithm in pseudo code for om
problem1 in a5i find an expression for the majority function2 write the decryption algorithm in pseudo code for ecb
problem1 in rc4 show the first 20 elements of the key stream if the secret key is only 7 bytes with values i 2 3 4 5 6
problemthe pump abating cipher block chaining pcbc mode is a variation of crc in which both the previous plaintext
problemthe block chaining bc mode is a variation of cbc in which all the previous cipher text blocks are exclusive