[theoh]

A number system can have any natural number as radix, so why not? https://en.m.wikipedia.org/wiki/Radix

From the posted article: "This leaves us with 122 legal one-byte UTF-8 characters to use"

Seems legit to me.

[dom0]

> It's very easy to write a cache-timing-safe version of base{16,32,64} encoding ...

> Base-122? Not sure if it's even possible.

Parent is clearly referring to his previous statement, not that Base-122 itself is not possible.

[theoh]

Not obvious to me at all.