Seems to me people want the RFID shielding for their passports and credit cards. Seems to me the potential risks are different for each.

Passports: My understanding is that the information is encrypted - and the key to allow the passport to be read (not copied) is the info in the machine readable part of the passport. You can see this if you use the ReadID Me app to read your own passport, it uses the machine readable info to enable the passport to be read. For IOS: https://apps.apple.com/us/app/readid-me/id1463949991 - https://play.google.com/store/apps/d...hl=en_US&gl=US for Android.

Conclusion re RFID Shielding for Passport: Not necessary, serves no purpose.

Credit Cards: Before getting to the technical aspects, let's do the legal - you as the consumer are protected against fraudulent use. Fraudulent use might be a pain to sort out, but won't cost you money.
If I download a credit card reading app to my phone, I can read the credit cards with the app - but without the CID number. However, I think due to encryption the cards are not clonable.

However, seems to me that there might be vulnerability that someone with an app or reader from an outfit like Square could in theory process a charge - with something like this: https://squareup.com/shop/hardware/u...eader-with-nfc

Conclusion re RFID Shielding for Credit Cards: Probably some limited benefit, but chances of anything happening without shielding is slight. Might be danger if smart phone is temporarily unlocked and read by portable reader.

Opinions?