Unknown 6-9-2019

Here’s a randomnly generated unknown cipher. I’ll give a hint because all my ID tests got this one wrong. I needed the crib to solve it.

???
YIIXA JPKNL FCFFK XYCMJ XKGWF FPEFB FFNSE EIZRM OFYAM AGHIK ELXYB
VFFMO RIXJG CRJES UOOFF FDXFY XMFXM IEXMD SGZZF OHLLI JJVUP CFZRM
JFMEM ORJID XOFFF ONRKX YBFYT WFTCR MCTVE SFTFP UER.

caesar-shifted crib: FYLTTIBNQQNYITYTUN

Hint: YMNXNXFVZFLRNWJKTZWHNUMJW

3 thoughts on “Unknown 6-9-2019”

  1. It continues HYGOLMQ. My analyzer did not place the right type near the top, but it was close enough that I was pretty sure of the type after I eliminated most of the others. I needed the crib and the hint confirmed the type variant. None of my automated programs succeeded, but I worked interactively with a program I have and was able to guess a phrase and expand on it enough to complete the solution.

      1. One trick I did on this one that’s new: after placing the crib, I knew the 2nd and 4th letters of the pt, so I did a computer search through several books and counted up the beginnings that had the same 2nd and 4th letter. The most frequent combination of 1st and 3rd letter in my search were the same as the correct pt letters. This helped me guess words elsewhere.

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