In their book on codebreaking historical ciphers, Elonka Dunin and Klaus Schmeh describe double columnar transposition (see below) as "one of the best

NEMA (machine)

about 10 kg and measures approximately 36×32×14 cm. Fialka Typex SIGABA Klaus Schmeh (2008). Codeknacker gegen Codemacher: die faszinierende Geschichte der

Voynich manuscript

Nick Pelling as well as Klausis Krypto Kolumne of cryptology expert Klaus Schmeh [de]. The Book of Woo was also discussed in the 2017 book Unsolved! by

Rohonc Codex

Csapodi 1973. März 2015 "Das Manuskript, das niemand lesen kann"; Text von Klaus Schmeh; © für Abb. 1-4 Ungarische Akademie der Wissenschaften, Budapest Láng

HX-63

adopted by only one department of the French Government (about 1960). KL-7 Klaus Schmeh (2008). Codeknacker gegen Codemacher: die faszinierende Geschichte der

Found in articles

Transposition cipher