Somerton Man Code
An unidentified man found dead on an Adelaide beach in 1948 with the word 'Tamám Shud' in his pocket — and a page of letters that may or may not be a cipher.
Interactive Exhibit
Try a substitution: type a single letter A–Z and a candidate plaintext letter to substitute throughout the inscription. The widget redraws the four letter-groups with your guess in place. Track B — exploration only.
MRGOABABD
MTBIMPANETP
MLIABOAIAQC
ITTMTSAMSTGAB
Why This Matters
On 1 December 1948 an unidentified man was found dead on Somerton beach near Adelaide. In a fob pocket was the printed scrap 'Tamám Shud' ('it is ended'), torn from the last page of a copy of Edward FitzGerald's translation of Omar Khayyám's Rubáiyát. The book itself was later found, and inside its back cover, faintly pencilled, was a sequence of letters: MRGOABABD · MTBIMPANETP · MLIABOAIAQC · ITTMTSAMSTGAB. The letters have never been deciphered.
The case is one of the most famous unsolved deaths in Australian history. The man wore tailored clothing with all labels removed; an autopsy could not determine cause of death; he carried no identification. Code-breakers at Australian Naval Intelligence in 1949 examined the pencilled letters and concluded they were probably a one-time pad or a book code keyed to the Rubáiyát, but no key text has produced a confirmed plaintext. In 2022 forensic genealogist Colleen Fitzpatrick and Professor Derek Abbott (University of Adelaide) used DNA from a hair preserved in the death mask to identify the man as Carl 'Charles' Webb, a Melbourne electrical engineer — but the pencilled letters remain unsolved.
There are 44 or 45 letters depending on transcription. Letter-frequency analysis shows the letters do not match natural English — too many M's and T's, no Q, X, or Z. This is consistent with either: (a) a one-time pad XOR-style output, where any plaintext is possible; (b) the first letters of words from a Rubáiyát stanza or other indexed text — i.e. an acrostic book code. The Adelaide police, Naval Intelligence, and decades of amateur cryptanalysts have all failed to find a stanza that produces sensible English under either reading.
The Somerton Man case is a touchstone for combining modern forensic genetics with classical cryptanalysis — the body's identity has now been recovered through DNA, but the cipher remains as opaque as it was in 1949. It is a regular case study in courses on Cold War espionage and book ciphers, and a persistent reminder that not every cipher is meant to be solved by outsiders.
| Hall | Hall XII · Unsolved |
| Region | Adelaide, South Australia |
| Era | Post-WWII Australia · 1948 |
| Discipline | Suspected one-time pad / book code |
| Track | B (substitution playground) |
| Modern echo | DNA forensics + cryptanalysis · unsolved cold cases |