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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
problem1 what is the size of data unit in rc4 what is the size of data unit in a512 list the operation modes that can
problem1 define cfr and list its advantages and disadvantages2 divide the five modes of operation into two groups those
problem1 define cbc and list its advantages and disadvantages2 define cfb and list its advantages and disadvantages3
problem1 explain why modes of operation arc needed if modern block ciphers are to be used for encipherment2 list live
problem1 write two algorithms for the dss scheme one for the signing process and one fur the verifying process2 write
problem1 write two algorithms for the rsa scheme one for the signing process and one for the verifying process2 write
problem1 in the schnarr scheme prove the correctness of the verifying process2 in the dss scheme prove the correctness
problem1 in the schnarr scheme explain why the calculation of si is done in modulo p but the calculation of s is done
problem1 in genial schnarr or dss what happens if alice uses the same value of r to sign two messages explain your
problem1 using the ws scheme let q 59 p 709 and d 14 find values for el and e2 choose r 13 find the value of s1 and
problem1 define the schnarr scheme and compare it to the ligamal scheme2 define the dss scheme and compare it with the
problem1 compare and contrast existential and selective forgery2 define the rsa digital signature scheme and compare it
problem1 compare and contrast a conventional signature and a digital signature2 list the security services provided by
problem1 write an algorithm in pseudocode to find a primitive root for the set zp2 write an algorithm in pseudocode to
problem1 write an algorithm in pseudocode for the square root primality test2 write an algorithm in pseudocode for the
problem1 the square-and-multiply fast exponentiation algorithm can also be designed to test whether the exponent is
problem1 determine whether the following mersenne numbers are primes m m29 and m312 write some examples to show that
problem1 define the chinese remainder theorem and its application2 define quadratic congruence and the importance of