I am reading Turing's "Computing machinery and intelligence" paper (https://www.csee.umbc.edu/courses/471/papers/turing.pdf) and found a fragment in which he says:
I have set up on the Manchester computer a small programme using only 1,000 units of storage, whereby the machine supplied with one sixteen-figure number replies with another within two seconds. I would defy anyone to learn from these replies sufficient about the programme to be able to predict any replies to untried values.
It looks like a machine learning problem to me :) but putting my interest on AI aside, my question is the following:
Does anyone know what this program was doing?
I am very curious.
PS: By the length of the input and output, I suspect it was an encryption algorithm, but I would appreciate any clue to the actual program.