[23434dsf]

So if I strolled through the airport with a high power NFC reader/writer, I could ruin a lot of peoples trips?

[crowbahr]

In addition to the mechanisms people are describing here - passports have a metal mesh in them to disrupt NFC signals. It's not a full faraday cage but it works on similar principles. The passport has to be _open_ to be read from, and then only after you transmit the MRZ will you get anything.

[raron]

> passports have a metal mesh in them to disrupt NFC signals

I don't think that is universally true. At least I can read my closed 2 years old passport with my phone.

[edent]

No.

NFC chips can be locked. That means the data can't be overwritten. No matter the writer, nor its strength, you can't overwrite a passport's chip.

I suppose you could use an EMP - but that would ruin a lot more than just some trips.

[lukan]

"The NFC chip in a passport is protected by a password. The password is printed on the inside of the physical passport. As well as needing to be physically close to the passport for NFC to work0, you also need to be able to see the password."

[lxgr]

Even that password only gives you read access.

I don't think ICAO passports can ever be rewritten post-issuance. Some national IDs can, e.g. to change the holder's residential address, but for passports, I don't think any part of the on-chip data can be changed post-issuance, since it would also require re-printing data on the photo page usually under protective plastic.

[wkat4242]

Yes but. In Europe this tech is also in our id cards whether said passport is printed on the outside (considering it's just a credit card format). You still have to see it but it doesn't have to be opened to the right page like a passport.

Both sides even have the info printed. One side in human format, the owner side in machine readable.

[daveoc64]

What makes you think you could do this?