Convert "hello world" into hex "hello world" in hex =
68656c6c6f20776f726c64
encrypt the above binary content with a 4 bit block cipher whose
codebook consists of 6, 0, 13, 4, 3, 1, 14, 8, 7, 12, 9, 15, 5, 2,
11, 10 (The codebook is simply the output blocks in the order of
the integers corresponding to the 16 possible input blocks).
What will the encrypted output be for this
text?