>One surprising thing I learned is that ChatGPT can solve the word segmentation problem quite well, and it can even add punctuation and capitalization back into the message. While LLMs are far too slow to participate in the performance-intensive crack (we can use simpler heuristics like trigrams for that,) their ability to make semantic sense of partially mangled text might still be useful in automating the “sense of rightness” which hitherto has been left to human cryptographers.

Also. Plot device in Cryptonomicon (iirc)

Lagniappe https://www.amazon.com/Codes-Villains-Mystery-Stories-Cipher...