Update 2018-01-05: Euchre Mutt is on fire! He’s solved two CodeAWeek puzzles in two days, giving him a very comfortable lead on our High Score list. This challenge remained unsolved for 45 days, which means he is awarded 45 points. To see the solution, go here.
Here’s Challenge #13 for November 21, 2017.
Today, I wanted to learn about ciphers that use fractionation. I decided on a method created by a French amateur cryptographer who spent his days in working in a customs warehouse.
Three hints:
- J=I
- You need to figure out the keyword and the period.
- “Now Morn her rosie steps in th’ Eastern Clime, Advancing, sow’d the earth with Orient Pearle.”
And the ciphertext is:
xmwuv hnmhv hderq
tbkht newsv hnmhv
fpeks ngifq rlqv
With CodeAWeek.com, I hope to release one cipher, puzzle, or mystery each week. Anyone can attempt to solve. The winner is the first person to send a correct solution and a description of the solve method to codemaster@codeaweek.com. Once a correct solution is e-mailed, I will publish a follow-up post, congratulating the winner and revealing the secrets of the code.
You may post questions or theories in the comments, but DO NOT POST SOLUTIONS. E-mail them to codemaster@codeaweek.com.
Code a Week 
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