Klaus Schmeh

Klaus Schmeh ist Experte für historische Verschlüsselungstechnik. Seine Bücher "Nicht zu knacken" (über die zehn größten ungelösten Verschlüsselungsrätsel) und "Codeknacker gegen Codemacher" (über die Geschichte der Verschlüsselungstechnik) sind Standardwerke. In "Klausis Krypto Kolumne" schreibt er über sein Lieblingsthema.

This might be the cryptogram discovery of the year: a manuscript containing some 7000 illustrations, many of them with encrypted (?) captions. Can a reader make sense of these unusual artworks?

At the RSA 2020 I gave a talk about post quantum cryptography. It’s now available on YouTube.

A. J. Jacobs, a successful US author and journalist, has provided me scans of an encrypted journal written by a renowned psychologist. Can a reader break it?

Last December, Jarl Van Eycke and Louie Helm solved a bigram-substitution ciphertext consisting of 750 letters – a new world record was reached. Now I have created a 600-letter bigram challenge. Can it be solved, too, or have we reached the end of the line?

Today I visited the USS Pampanito, a museum u-boat at Fisherman’s Wharf in San Francisco. I was especially interested in the encryption machine that is allegedly on display on this ship. My trip ended up as a disappointment.

Crypto collector Ralph Simpson owns a small cipher device that consists of two metal disks. The origin and the purpose of this unusual tool are unknown. Suggestions from readers are welcome.

Five years ago I asked my readers for information about seven little-known cryptograms created by criminals. Meanwhile, I’m a little wiser, but I still would like to know more about some of these encrypted messages.

Blog reader Mario Gerlach has provided me a picture of an encrypted graffiti he saw in Nördlingen, Germany. Can a reader solve this cryptogram?

Earlier this week I gave an interview (in German) about Crypto AG and the RUBICON affair. It is now available online.

According to recent press reports, the CIA and the BND secretly acquired Swiss crypto machine manufacturer Crypto AG and sold backdoored encryption technology.