Fakability is not an actual word. I came up with it to explain what I am looking for - a word that aptly describes something that can be easily faked. For example,
The fakability of this device is so high that we can never be sure if the sample we are holding came from the original source.
you see, there is a technical context here,
Those parameters have high fakability, you must double check their values as a script kiddie can easily simulate them.