There was an initiative to have all of them able to by Jan 2020 but didn't address the security flaws of allowing anyone access to that information: https://www

There was an initiative to have all of them able to by Jan 2020 but didn't address the security flaws of allowing anyone access to that information: https://www.c4isrnet.com/air/2018/01/25/gao-fix-security-flaws-or-anyone-will-be-able-to-track-a-f-22/ https://www.c4isrnet.com/air/2018/01/25/gao-fix-security-fla... I know mode 5 is supposed to be a crypto version of ADS-B but not sure how many implement it https://en.m.wikipedia.org/wiki/Identification_friend_or_foe https://en.m.wikipedia.org/wiki/Identification_friend_or_foe