Another tool I have heard is useful in Benford's law. Numerically, most natural data in the world starts with a 1 (31% of the time) then a 2(17% of the time) and decreases down to 9 (like 4% of the time) and this can be used to detect fraud, fake accounting, and fake data sets. I heard it was fairly useful of photographs as well.
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The natural distribution of numbers. It works in hidden data like first layer steganography but you need to rearrange the data first in a way that is numerically suspicious. Distribution checking on encoded data is not among the most common or useful options. Is useful in other scenarios.