This was explained in the article right there:

> it suspected that the plaintext of Nr. 173, SIPVX, might be related to the plaintext of the unbroken MVUEH message

It makes sense that Nr. 172 and Nr. 173 might be related since they were sent at around the same time.

In Nr. 173, "ROSENOW ROSENOW" was also present.

It also makes sense that a longer crib would generally be more effective than a shorter one.

Rosenow is a municipal (around 32km²) and in there is a district also called Rosenow. So the sender just specified his current position a bit more.

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.

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.

Slopped up site https://mvueh-enigma-solved.carterl.chatgpt.site/ seems to indicate it's due to:

  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.

Looks like Q is used as an abbreviation for CH

i would assume yes, to throw off decyphering. even more impressive that they managed to crack it

https://en.wikipedia.org/wiki/Rosenow

I believe Germans spell it achtually.