This cryptography challenge uses a modified CBC-MAC using the Camellia block cipher
where the system applied a non-standard padding mechanism where messages perfectly 
aligned with the block size remained unchanged, introducing a vulnerability. The 
solution script revolved around manipulating message padding and truncating MAC tags differently
based on message length - by submitting messages that were and were not multiples of the block size, 
an attacker can retrieve the most and least significant 63 bits of the final block, so it was possible
to forge a valid MAC and retrieve the flag.
