Re: RC5 cracking on the sly
Ahh distributed.net!
I returned back at school after the summer break one year to find they'd replaced the mix of 386 and 486 PCs with shiny new Celeron 300s (them being the ones that quite happily ran at 450 MHz if asked). Essentially being P3s with their cache neutered, although I think the 300a socket 370s were graced with > 0 l2 Cache, they handled distributed.net rather well.
So I went around them with a floppy, installed distrubted.net, tweaked the bios to run at 450 and had about 30 PCs doing my dirty work. Just had to drop by every machine every few days with a disk to give them new work and grab the complete work...