WARSAW, Poland (AP) — A global organization of engineers on Tuesday honored the three Poles who broke the German Enigma cipher codes and helped end World War II.

J. Roberto de Marca, head of the Institute of Electrical and Electronics Engineers, unveiled a stone memorial with two plaques in honor of mathematicians Marian Rejewski, Jerzy Rozycki and Henryk Zygalski — who first cracked Enigma-coded messages in 1932. During the war, they worked with British code breakers at Bletchley Park in England on codes that changed daily.