Since when are passport numbers secret? If that's real that's totally new to me. In Israel you use your ID number, if a citizen, or passport number if not, in

Since when are passport numbers secret? If that's real that's totally new to me. In Israel you use your ID number, if a citizen, or passport number if not, in tons of transactions (as a citizen it somehow flows to your yearly taxes, not sure exactly), even stuff as mundane as getting gas needs an ID number. If passport numbers are meant to be secret I suspect a lot of people are in for a rude surprise.