https://www.wired.com/story/us-border-patrol-hasnt-validated-e-passport-data-for-years/For over a decade, US Customs and Border Protection has been unable to verify the cryptographic signatures on e-Passports, because they never installed the right software. A skilled hacker could alter the data on an e-Passport chip—like the name, photo, or expiration date—without fear that signature verification would alert a border agent to the changes. That could theoretically be enough to slip into countries that allow all-electronic border checks, or even to get past a border patrol agent into the US.