Bill, I'll probably go down to the notary's this morning to get the thing registered; I don't want to pay $ 50.00 to surety for what's likely to be a one-shot deal. And I've been leaning towards the side of releasing it into the public domain anyway, so here goes: (And besides, I can't believe everyone else missed this; one of you has got to know about this already): If Alice and Bob are members of a reasonably non-compromised and free of colluders dining-cryptographers network, with a protocol for reserving blocks for the transmission of data packets, then if they both send a data packet in the same block, they can each read what the other is saying but to the rest of the DC-net it is garbled. Since what is broadcast is the XOR of Alice's and Bob's data, Alice can read Bob's data by XOR'ing the output of the DC-net with her attempted input; Bob can recover her data the same way. Comments? (At the very least, it doubles the bandwidth for the two participants...) Phil