well i have been reading some more and come across standard deviation. would this be a pursuable possibility? because you could compare that against all other encrypted files (even tho they use a different key) and should be a similar outcome right?

Why? (Why would they have a similar StdDev?)

Standard Deviation measures deviation from the mean. Given a full (eg. exhaustive, but necessarily small) set of all the possible datasets of a given size; the variance (and thus StdDev) of the standard deviations, would range, and be equally distributed, between zero and infinity.

Hence,the StdDev of any single sample --of anything -- means exactly nothing!

That is, if the inputs are exactly 'random'; then the standard deviations are linear; and thus, completely uninformative.

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In reply to Re^3: Calculating corruption by BrowserUk
in thread Calculating corruption by james28909

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