It was partially explained by the article. It was not stated that ROSENOW was repeated in 173, and it was not obvious from the article text why ROSENOW would ever be repeated. Thus my curiosity.
A sibling commenter explained it - Rosenow is both a municipal name and a district name, so naturally it would be repeated. (Like "New York, New York")
It also makes sense that a longer crib
would generally be more effective than a
shorter one.
It would seem to me that the odds of looking for even a single ROSENOW in the decrypted message would be plenty. The odds of a single ROSENOW randomly occurring in incorrectly decrypted output are vanishingly small. So it seems to me that looking for ROSENOW is a safer bet vs. looking for ROSENOW ROSENOW -- a single ROSENOW is a great sign you've got the correct key, whereas looking for ROSENOW ROSENOW seems like it would deliver false negatives (think of all the times we say "New York" rather than "New York, New York")
I'm a novice at crypto though, so, maybe I've got that totally wrong.
The reason a crib is useful is because the enigma can't route a letter back to itself. So, you can slide the crib along the message until no letters line up, and that's possibly where it is. If your crib is "the", that's not terribly useful, because it could exist anywhere. The longer the better.
Maybe naive of me, but could it simply just be the overfitting of the same tokens being sent on the input twice because of repetition rather than some unknown implied intelligence.
Do we have any kind of transcript as to how the message was cracked, and whether this was cheaper or more expensive than simply Bombe-style trying all the combinations?
As the article states, the LLM built code for both an enigma simulator and a bombe simulator.
Breaking enigma is often about using lucky or educated guesses to heuristically reject large chunks of keyspace to leave the remaining keyspace computationally tractable.
Note that the key (lol) complication with this message seems to be that it had a wheel rollover that most messages do not have to deal with, and that rollover drastically reduces how much you can reduce the potential keyspace using all the techniques noticed by the original crackers.
The wheel rollover I think just requires more brute force. Unfortunately, this might be an example of OpenAI the company having vastly more compute time and effort than your average enigma nerd. For example, modern compute clusters like supercomputers can tractably brute force enigma with no cleverness in like a day or less, while home computers would still take thousands of years to compute that. It's very scalable. Did astra have access to significant compute?
However, even considering that, the inferences made by the LLM are good, and picking this specific message to attack, precisely because it should be soluble but might have had an extra wheel rollover that made it more computationally intractable for hobbyists but not a large company is a clever thing to do for the LLM.
This was done by an OpenAI subscriber, not an employee, so Astra would not have had access to OpenAI's massive compute for brute forcing. The scripts it wrote presumably ran on the computer of the customer. (ChatGPT can run scripts on OpenAI's servers, but it has a 45 second execution limit.)
> Unfortunately, this might be an example of OpenAI the company having vastly more compute time and effort than your average enigma nerd.
It seems like a lot of the recent "breakthroughs" come down to this: spending millions of dollars in compute to solve problems that essentially amount to recreational math problems
Interesting. Do we know the reason why those specific messages were sent with different keys? I would imagine that there were separate keys for special high-security messages or something like that, but the almost identical content and the way the key was changed here (first only part of the configuration, then suddenly everything) makes it look more like an error or a test.
The SS-Totenkopf Division was advancing east during the opening weeks of Operation Barbarossa, the German invasion of the Soviet Union. 10 July 1941, the division had just fought its way through the Soviet border defenses around Sebezh. It had moved through Lithuania and Latvia, crossed the Dvina area, and advanced through Dagda toward a place German records called "Rosenow." The division moved out of the Rosenow area around 6 July, fought around Sebezh on 8-9 July, and then continued east/northeast toward Opochka and eventually Porkhov.
A while ago I read Between Silk and Cyanide, the autobiography of one of the main actors of WW2 cryptographers, Leo Marks.
He had a whole unit working on 'indecipherables', too-hard-to-decrypt messages where the field-agents either misspelled words or misused the encryption keys. You can imagine how often agents misspelled, having to do all the encryption manually under great lots of stress.
(There's an interesting story on Operation North Pole, where Marks suspected that a Dutch resistance group had been overtaken by the SS, and it was actually the SS sending the encrypted messages: all the encryption and spelling was suddenly perfect)
I'm surprised "Bitte" --> "btte" was a hurdle. "Bitte," or "please," is ubiquitous in German. The more common the term, them more likely you'd be to see some contractions. Dropping the "i" is pretty logical- anyone looking at it would see immediately what it meant.
> i would assume yes, to throw off decyphering. even more impressive that they managed to crack it
Were operators of enigma machines aware enough of cryptology or the weaknesses of enigma, for that to have been done intentionally to prevent decryption? I doubt it, otherwise _many_ things should have been done _much_ differently by the operators.
> Daily reports and sketches pertaining to offensive engagements across Lithuania in the Gvardeysk and Ukmerge areas, 22-28 Jun; advance across Latvia and offensive operations in the Deguciai, Daugavpils, Zidina, and Dagda areas, 28 Jun-4 Jul; and invasion of Russia and offensive and mopping-up operations in the Rasina (Rosenow), Opochka, Isaki, Zaborov'ye, and Gorki areas, 5-19 Jul 1941. Also periodic division circuit diagrams, 29 Jun-18 Jul 1941, and data on enemy operations.
