Comment by waffle_ss

I wrote a Ruby gem to address this problem of hiding sequential primary keys that uses a Feistel network to effectively shuffle int64 IDs: https://github.com/abevoelker/gfc64

So instead of

    /customers/1
    
    /customers/2

You'll get something like

    /customers/4552956331295818987
    
    /customers/3833777695217202560

Kinda similar idea to this library but you're encoding from an integer to another integer (i.e. it's format-preserving encryption). I like keeping the IDs as integers without having to reach for e.g. UUIDs