US Navy Cryptanalytic Bombe - A Theory of Operation and Computer Simulation. - Magnus Ekhall; Fredrik Hallenberg (HistoCrypt, 2018)

Analysis of the US Navy Cryptanalytic Bombe Schematics and Simulation of Selected Circuits. - Magnus Ekhall; Fredrik Hallenberg (HistoCrypt, 2022)

How we set new world records in breaking Playfair ciphertexts. - Elonka Dunin; Magnus Ekhall; Konstantin Hamidullin; Nils Kopal; George Lasry; Klaus Schmeh (Cryptologia, 2022)

A WW2 device for breaking the M-209 encryption machine. - Magnus Ekhall; Klaus Schmeh (HistoCrypt, 2023)