It's becoming cliche to use distributed systems to tackle large volume sets, but have you ever considered how you might do it when every node, every participant, is against you? Cracking With The Enemy will discuss the design choices and approach that were used in the creation of CAS53214, a free, open source, distributed password cracker with a twist: it cryptographically isolates each node and doesn't trust any of the answers it receives. Brian Mork (@hermit_hacker) was one of the two lead designers and implementers of this solution, which was used in the DefCon 19 Crack Me If You Can contest to allow two people to run the efforts of 20+ contributors.