Nice catch! I’m convinced that 47 refers to the number of 64-bit blocks in the hex code–derived by dividing 3008 bits by 47.
EDIT: I know it was mentioned, but has anyone actually tried using the Lucifer cipher? It fits the clues perfectly, and I don’t think there’s open-source versions of it. We’ll either need to code it or do it by hand. The former is probably best, as the latter would require a lot of work considering we don’t know the key.
I posted this before, but here’s a reference to an ARG solution that used Lucifer as a hint: Lucifer Puzzle
You’ll notice that he used DES, since it’s ultimately the same as Lucifer just without the S-boxes and with a reduction in key size (128 to 56 bits). He also managed to solve the first block while using the wrong mode, so it’s possible we may still be able to derive something even if we don’t know exactly which mode to use at first.
It makes more sense based on the number 47 that we would use DES instead of Lucifer, as Lucifer does not use a 64-bit key size. However, a 32-bit block size could be used.



