monoalphabetic

Definitions

adjective cryptography Of a substitution cipher, using the same fixed mappings from plaintext to cipher letters across the entire text.

mono- +‎ alphabetic

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Assuming that ZUF'Y is "isn't", and it's a monoalphabetic cipher, that gives "t_s__ __s __s_ isn't t___, t_s__ __s t___ isn't __s_."

Making Light: *Spoilers* Paranormal Activity *Spoilers* 2010
Constant shift monoalphabetic solution, in which each plaintext letter is shifted a fixed number of letter positions to the right

Citizendium, the Citizens' Compendium - Recent changes [en] Howard C. Berkowitz 2010
The monoalphabetic keys of increasing complexity involve:

Citizendium, the Citizens' Compendium - Recent changes [en] Howard C. Berkowitz 2010
Constant shift monoalphabetic solution, in which each plaintext letter is shifted a fixed number of letter positions to the right

Citizendium, the Citizens' Compendium - Recent changes [en] 2008
It's reasonable to illustrate basic cryptanalysis first with monoalphabetic substitution frequency analysis, and maybe the index of coincidence to get the number of polyalphabets, but things like differential cryptanalysis is its own advanced topic.

Citizendium, the Citizens' Compendium - Recent changes [en] 2008
[...] κώδικας σύμφωνα με μια τύπισσα ονόματι Julian Sanchez είναι αυτό που λέμε a simple one-to-one, monoalphabetic substitution [...]

Solution to the Fringe Glyph Cipher 2009
So the code is nothing fancy: It’s a simple one-to-one, monoalphabetic substitution cypher.

Solution to the Fringe Glyph Cipher 2009