Suppose two people want to play poker over the network. To "deal" the cards they need a mechanism for fairly choosing a random number x between them; each party stands to lose if the other party can unfairly influence the choice of x. Describe such a mechanism. Hint: You may assume that if either of two bit strings x1 and x2 are random, then the exclusive-OR x = x1 ⊕ x2 is random.