An AI-assisted break of the Enigma M4 Triton message of 6 March 1945

Jason Parker-Burlingham broke the Enigma M4 Shark (Triton) message of 6 March 1945 that had been posted on Crypto Cellar Research since 2006, using cribs derived from a Bletchley Park decrypt (ZTPGU/36892 from DEFE 3/741) and a similar German signal in U-806's war diary, plus an M4 bombe simulator and an independent M4 simulator built via prompting Claude Opus 5.5. The decrypted text gives radio-beacon schedules for groups 11 and 12 on 7–9 March under period "Bruno", with machine settings M4, thin reflector B, Greek wheel gamma, rotors IV V III, rings A A P U, start Z K S A. Frode Weierud calls it, to his knowledge, the first AI-assisted break of an Enigma M4 message and notes that archive research pays off on short singletons where ciphertext-only hill-climbing often fails.