distributed computing

I'm in the planning phase of a demo which should demonstrate the power of a distributed object technology which I'm working with. Any ideas for neat crypto-related distributed computation demos would be much appreciated. I've thought of: * brute forcing RC5 (lots of people are doing this already) * factoring attack on RSA modulus * Certicom's ECC challenge But I'm looking for something with more of a sort of gut-level appeal. Cracking SSL packets might be good. Hrmm. thanks for any input ... *jon