Tony Hoyle
Active Member
Cfr. password display on an Apple: only the last digit is shown for some time and all others are replaced by a filled circle.
But for short codes it’s fairly trivial for someone to see which digits you're punching if they are attentive.
I never liked that.. it's a thing that came in with mobile presumably due to the fiddly keyboards they all had back then, but it makes shoulder surfing trivially easy.