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Fritz Menzer was one of the brightest German cryptologists of the Second World War. A number of important points in his biography are still unclear. Can my readers solve these mysteries?

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On Wikimedia, photographs of a number of lesser-known encryption devices from Switzerland are available. Can a reader tell me more about them?

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The Siemens & Halske Geheimschreiber (T-52) was the second-most im portant encryption machine of the Germans in World War II. George Lasry has recently published a few computer-based attacks on this device.

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A Reddit user has posted photos of an unusual machine, the purpose of which is unknown. Some say it might be an encryption machine. Can a reader tell more about it?

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The Enigma breaking machine “Bombe” had a considerable impact on the course of the Second World War. A recently started crowdfunding campaign aims to create a new Bombe display area in Bletchley Park.

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In the Second World War, the Germans constructed a voice encryption machine. I have only very little information about this device. Can my readers help me to find out more?

OLYMPUS DIGITAL CAMERA

A store in Peekskill, New York, has an interesting encryption machine on sale. Can my readers help to find information about the background of this device?

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Encryption technology of the Cold War is a very interesting, yet also difficult topic. Much of the relevant information is still classified. This is also the case for a simple German encryption device named ACP 212. Does a reader know anything about it?

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The SG-41, also known as Hitler Mill, was the successor of the Enigma encryption machine. Detectorists have now found a specimen in a Bavarian forest.

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A few years ago I took pictures of a rare encryption device from the Cold War era. Can a reader help to find out more about it?