Engineering your own voynich

[oshfdk]

The one on the page 1.

Out of curiosity I tried running the code you attached (Algo.txt) to try decrypting the ciphertext on page 1 and to encrypt the proposed decryption:

Code:

Original: FaiT Kzz nmnuy maig qar Tiooiea bar nmaei Tmz qooiea ... Decrypted: Vro  zz nmnuy maig qar  iooiea bar nmaei  mz qooiea ...

Code:

Original: THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG. THIS PANGRAM CONTAINS ALL LETTERS EXCEPT C, D, J, S AND W. Encrypted: BHE yun ZUICK yun LROWN yun NOX yun JUMPS yun XVER yun BHE yun TAZY yun DOG. yun BHIS yun YANGRAM yun CONTAINS yun KLL yun TETTERS yun MXCEPT yun C, yun D, yun J, yun S yun KND yun W.

So, I'm not sure about the verbal explanation (it does look iffy, but I didn't check it thoroughly), but the code does not decode the original cipher from the beginning of this thread to any meaningful English plaintext.