Thanks! It indeed makes sense. I used the RC-5 cipher around 2015 to do that ID generation trick (and it's still in place in AWS as I can see), and there was n

Thanks! It indeed makes sense. I used the RC-5 cipher around 2015 to do that ID generation trick (and it's still in place in AWS as I can see), and there was no NIST standard back then. It also was not a really sensitive application, we just wanted to make IDs opaque.