Compute the output of the MixColumns transformation for the following sequence of input bytes “67 89 AB CD”. Apply the InvMixColumns transformation to the obtained result to verify your calculations....

Compute the output of the MixColumns transformation for the following sequence of input bytes “67 89 AB CD”. Apply the InvMixColumns transformation to the obtained result to verify your calculations. Change the first byte of the input from ‘67’ to ‘77’, perform the MixColumns transformation again for the new input, and determine how w many bits have changed in the output.
Sketch the overall structure of AES and analyze in detail the sequence of transformations in each round and its corresponding decryption function with an example given Plaintext: 123456ABCD132536 Key: AABB09182736CCDD CipherText: C0B7A8D05F3A829C
In one of his cases, Sherlock Holmes was confronted with the following message. 534 C2 13 127 36 31 4 17 21 41 DOUGLAS 109 293 5 37 BIRLSTONE 26 BIRLSTONE 9 127 171 Although Watson was puzzled, Holmes was able immediately to deduce the type of cipher. Can you?