Question: CIPHERTEXT _ 6 B was encrypted using all four rounds of the Heys cipher where K 1 = K 2 = K 3 = K

CIPHERTEXT_6B was encrypted using all four rounds of the Heys cipher
where K1= K2= K3= K4= K5='5555'=0101010101010101. The same key was
used to encrypt each block (i.e., the plaintext was encrypted using ECB mode).

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