The Enigma Machine's Secret
HH88, a cipher/code/secret, is shrouded in mystery/secrecy/intrigue. While the specifics/details/facts of HH88 remain unknown/unveiled/obscured, it is believed/suspected/thought to be a variant of the famous/renowned/infamous Enigma machine/system/code. This complex/intricate/sophisticated device, used by the Axis powers/German military/enemy force