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.

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In 1934, a US magazine published an encrypted message a reader had found in an old document. The solution is not known to me.

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Two postcards from the early 20th century are written in Morse code or something similar. One of these cryptograms is still unsolved.

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A Facebook user has posted a number of scans of a 19th century pocket lexicon with about 80 pages of code in it. Can a reader solve it?

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The Museum für Kommunikation in Frankfurt owns a cipher tool from the 19th century. Not much is known about it. Can a reader find out more?

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US artist Andy Bauch has created Lego mosaics that encode money in BitCoins and other crypto-currencies. Can a reader break his codes?

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A medal that is depicted in a Freemason document from 1952 bears two encrypted inscriptions. Can a reader decipher them?

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English actress Diana Dors left behind an encrypted message. This cryptogram allegedly leads to two million pounds.

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The Playfair cipher is an encryption method from the 19th century. Some say that a Playfair-encrypted message of 50 or less letters is still secure today, if the method is used properly. Let’s put this claim to the test.

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In 1905, an encrypted postcard was sent from San Francisco to Paris. Can a reader break it?

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Bletchley Park, where the British broke the Enigma during WW2, is a must-see for everybody interested in crypto history. Last week, a new exhibition opened – in the presence of His Royal Highness Prince Edward.