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kotlinlang

I just released the first version of kpermute: a Kotlin library for fast, deterministic integer (and long and unsigned) permutations. It’s built for shuffling enormous integer domains/lists (or for data obfuscation) in a memory-constant, reversible way. 

:link: Check it out: <https://github.com/Eigenity/kpermute|https://github.com/Eigenity/kpermute>

Thanks for any feedback, pats on the back, or subtle nods of approval.

Interesting share <@U09QQKQBJ5V> and thank you. It looks like one use-case example for this library might be providing anonymous user ids for an analytics API without giving the origin id away. Seems like you could use a different seed for each business using the api so differentiation of the same profiles across businesses would remain anonymous.

Do I have the right idea conceptually? We do something like this for a commerce api so different clients (or the same integrator) can't track the same end user across websites or properties.

Awesome! Love seeing libraries like this and they're too often unappreciated. Maybe a list of use case descriptions like I mentioned above isn't a bad thing, though I can understand being careful to avoid certain recommendations.

Yeah I had it in the README but messes up the link. But yeah if it's really important with the obfuscation you should use a real crypto

We did a cryptographic version originally because we are passing the data out in one or two records at a time, but I can absolutely see where this would help with bulk data. What we did is not super feasible for large exports, etc.