PGP or GnuPG Keys
I was thinking it would be great if PGP public keys could be stored on an NFC Ring and shared with others. I'm not sure if this would be doable because of the size restriction. It may be possible with 1024 bit keys, but many people are going to 2048 and 4096 bit keys. Does anyone know more about the viability of using an NFC Ring for PGP key sharing? I think it would be great for key signing parties. People could meet in person and share and sign keys just using NFC Rings and smartphones.
I haven't used PGP for a very long time, so I'm not able to give a definitive answer, but this data is from the NXP website:
168 bytes of total memory, divided in 42 pages (4 bytes each)
144 bytes of user r/w memory area, divided in 36 pages (4 bytes each)
Field programmable read-only locking function per page for first 64 bytes
Field programmable read-only locking function per block
32-bit user definable One-Time Programmable (OTP) area
Data retention of 5 years
Write endurance 10000 cycles
Data retention and write endurance is considerably better than I had thought, but space is slightly limited.
@Simon-Bohlin yes, all currently NTAG203 Inlays.