static void Main(string[] args)
{
// http://homepages.herts.ac.uk/~comqjs1/Dining.pdf
// Consider n cryptographers or participants sitting at a dinner table.
var nopara = new Cryptographer("nopara");
var nullc = new Cryptographer("nullc", true);
var satoshi = new Cryptographer("satoshi");
// Each participant generates a random 1-bit secret and shares that secret with his or her left neighbor.
nopara.ShareSecret(nullc);
nullc.ShareSecret(satoshi);
satoshi.ShareSecret(nopara);
// Now each participant i separately has two secrets kh,i and ki,j in common with the two neighbors h and j respectively.
// Furthermore, every participant has a 1-bit secret message mi that is equal to 1 if the participant paid, and 0 otherwise.
// All participants broadcast the value bi = ki,i−1 ⊕ ki,i+1 ⊕ mi, where ⊕ denotes the exclusive OR operation (bitwise addition modulo 2).
var noparaResult = nopara.BroadcastResult();
var nullcResult = nullc.BroadcastResult();
var satoshiResult = satoshi.BroadcastResult();
// If we assume the participants are honest3 and there is only one payer p,
// every observer of all the broadcasts can reconstruct the message by calculating b1 ⊕b2 ⊕ ···⊕bn,
// since if broadcast bi contained ki,j then by the protocol bj must contain kj,i.
if (noparaResult ^ nullcResult ^ satoshiResult)
{
Console.WriteLine("Cryptographers paid.");
}
else
{
Console.WriteLine("NSA paid.");
}
Console.WriteLine("Press key to exit...");
Console.ReadKey();
}
private void ReceiveSecret(Cryptographer participant)
{
NeighborSecret = participant.Secret;
Console.WriteLine($"{Name}\treceived secret of {participant.Name}");
}
internal void ShareSecret(Cryptographer participant)
{
participant.ReceiveSecret(this);
}
