In this question you will see a weakened version of DES, we will
mark the i bit of the main key k of DES as k[i] (when 0 <=i<=55),
and the bits m,m+1,m+2,n as k[m,n] for m < n.
We will change the key derivation algorithm of the DES, so in
the 1,2,3,4,5,6,7,9,10,11,12,13,14,15,16 rounds the key will be
round the key will be k[0,47].
th k[8,55] and only In the 8
Describe a known plaintext algorithm which given (m,c) a
message and its cypher, the algorithm should find the main key
k (56 bits) with time complexity of 2^48 DES operations.
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