[pengaru]

Judging from TFA none of this was determined.

They (allegedly) matched the length of the encrypted name using a process of elimination from an AI-generated pool of possible names, arriving at one name that happened to match the name of Elizabeth Short's murderer, and then a bunch of other circumstantial details aligned.

[stogot]

In the article it also says the key to deicpher was Elizabeth and that the solution was approved by two cryptographers at the NSA

[pengaru]

Huh, apparently I didn't read the whole thing then.