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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
problem1 explain why there is no need for cipher text stealing in cfb ofb and ctr modes2 show the effect of error
problem1 show the encryption and the decryption diagram for ecb mode only the last two blocks when cipher text stealing
problem1 show the diagram for encryption and decryption in the cfb mode when r n2 show the diagram for encryption and
problem1 prove that the plaintext used by alice is recovered by bob in cfb mode2 prove that the plaintext used by alice
problem1 in cfb mode bits 3 to 6 in cipher text block 11 are corrupted r 8 find the possible corrupted bits in the
problem1 in ecb mode bit 17 in cipher text block 8 is corrupted during transmission find the possible corrupted bits in
problem1 show why cfb mode creates a nonsynchronous stream cipher but 0113 mode creates a synchronous one2 in cfb mode