Abstract: We present the first constant-round non-malleable commitment scheme and the first constant-round non-malleable zero-knowledge argument system, as defined by Dolev, Dwork and Naor (1991).

A Melrose man faces felony assault charges after an “intensive investigation” into a string of random assaults in Malden, police in Malden said. Ralph Fleuristil, 34, was arrested Feb. 6 after police ...