2024-03-21 18:09:34 <KipIngram   > Ran across a video of a guy doing some Enigma cracking.  He used a neat trick - he concatenated three copies of his "alphabet mappings" and worked off of the middle copy, which prevented him from having to do any modulo operations.
2024-03-21 18:10:41 <dzho        > see also: slide rules having completely duplicate scales
2024-03-21 18:11:17 <dzho        > and by "duplicate" I mean end-to-end, in case it wasn't clear
2024-03-21 18:11:23 <thrig       > slide rules have fewer problems with cache coherency issues
2024-03-21 18:11:49 <KipIngram   > :-)
2024-03-21 18:13:16 <KipIngram   > I improved mine a little.  On the first cut I was computing the reverse maps every time I needed one.  I modified it a bit to memoize those.  Of course, they could be straight up "pre-computed," but I didn't bother with that - computing them once each time I run the thing doesn't seem too bad to me.