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The Blitz Ciphers are an encrypted book allegedly found in London just after World War II. Only eight page scans have been published. Some of my readers consider the Blitz Ciphers a fake.
The M-209 is a small and robust encryption machine used by the US Army in World War II. Although several cryptologists have developed powerful methods to break the M-209, one series of messages is still unsolved.
“Who can solve this encrypted book?”, I asked five weeks ago. Blog reader Klaus Tappeiner from South Tyrol, Italy, could. His solution of the Tengri 137 cryptogram is absolutely ingenious.
During World War II a woman from Loiret, France, sent an encrypted message to a recipient in Nantes, France. Can a reader break this cryptogram?
The longest key ever publicly broken by exhaustive key search has 64 bits. A challenge I created a few years ago aims to improve this world record by one bit.
Unsolved ADFXVX messages from World War I Provided by George Lasry This page lists radio messages from World War I encrypted in the ADFGVX cipher that still wait to be solved. For more information click here. A list of known key is available here. It contains most certainly all the keys used during the period.…
In 1944 a Nazi spy located in New York sent encrypted messages via Paris to Germany. These cryptograms have never been deciphered.
The list of most-frequently used passwords has changed little over the past few years. In 2016, “123456” once again was the most popular one.
In 1999 cryptographer Ron Rivest published an encrypted text that was designed to take 35 years to break. 18 years later it is still unbroken.
Substituting letter pairs (bigrams) is an encryption method that was already known in the 16th century. Is it still secure today?
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