Multiparty protocols and logspace-hard pseudorandom sequences
László Babai, Noam Nisan · 1989
Let ƒ(x1, ···· xk) be a Boolean function that k parties wish to collaboratively evaluate. The i'th party knows each input argument except xi; and each party has unlimited computational power. They share a blackboard, viewed by all parties, where they can exchange messages. The objective is to minimize the number of bits written on the board.