As timestamps: "Broadcast 2 — 7:05; Broadcast 3 — 2:05" — this implies checking those timestamps in recorded audio logs in-game, where a hidden phrase or directive might play.
Once you have tuned into the frequency, the Enigma Machine will display a riddle: "I am first a fraud or a trick. Or such is the belief. Purpose built to deceive, now you own me. I am your thief." : SECRET . batman arkham city decode broadcast 2-7-5 3-2-5
Here's how to decode it and the :
: Once you enter the frequency into your Cryptographic Sequencer , it connects you to the Riddler's "Enigma" machine. As timestamps: "Broadcast 2 — 7:05; Broadcast 3
If your broadcast truly ends with (CBE), the letters are B G E / C B E . That doesn't directly make an English word, so try: Purpose built to deceive, now you own me
3 = C 2 = B 5 = E