Encryption enthusiast deciphers ‘Unsolvable’ WWI Encryption Code

"During World War I, the German military used a double columnar transposition cipher, changing the keys infrequently. The system was regularly solved by the French, naming it Übchi, who were typically able to quickly find the keys once they'd intercepted a number of messages of the same length, which generally took only a few days. However, the French success became widely known and, after a publication in Le Matin, the Germans changed to a new system on 18 November 1914. [1]"

https://en.wikipedia.org/wiki/Double_transposition_cipher#Do...

Courtesy of M. Édouard Snoden.

Came here to post this. Scrolling is a nightmare on this page. Why would you do this to your visitors? How would anybody still visit anyway?

Many codes are unbreakable (or are effectively so) if you only use them once, statistical attacks become possible with multiple messages. In this case if you send two messages of the same length with the same code both can be broken.

Also it's a rearrangement of the letters in the message. So a short message with distinct letters like 'Invade Pyatigorsk' could be easily cracked without knowing the code.