Unknown 8-17-19

Here’s a randomly generated cipher of unknown type. Two of my ID tests put the correct type in second place, but the third ID test didn’t mention the correct type. A more specific test put the correct type on top. Two of my solvers got it without a crib, but the third solver needed the crib.

???.
UTKFT LBEVS YYVZY NWZAE PUYUE EWCET XVERR OUSTL OMXVO QROVW CUUFY
UBWHS TCBCS ECXVW DEMAM ZGLDE HOKTW UPWUF VSHOE RUSXU ZI

caesar-shifted crib: HFXJBJRZXY

One thought on “Unknown 8-17-19”

  1. My Ph hill-climber couldn’t solve this without the crib; in fact it found trial decrypts with higher log tetragraph scores than the log tetragraph score of the solution. Here’s one such trial decrypt:
    rsumeanddiroatsoftheontoseforuisteratheachisacractyountontofallonevicthadwareehamarrionsundimatethingw

    Scores for above decrypt:
    Length of text: 102
    log digraph score: 801.00 ,Normalized: 793.07 ,Average for English: 750
    log trigraph score: 903.20 ,Normalized: 903.20 ,Average for English: 879
    log tetragraph score: 397.55 ,Normalized: 401.56 ,Average for English: 404
    log pentagraph score: 333.44 ,Normalized: 340.25 ,Average for English: 470

    Scores for the solution;
    Length of text: 102
    log digraph score: 749.00 ,Normalized: 741.58 ,Average for English: 750
    log trigraph score: 844.04 ,Normalized: 844.04 ,Average for English: 879
    log tetragraph score: 343.97 ,Normalized: 347.45 ,Average for English: 404
    log pentagraph score: 377.47 ,Normalized: 385.17 ,Average for English: 470

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