Is it possible to generate a key and store it on an NFC tag, so that it shows up with "sc_auth hash"? I'm trying to login to OSX using NFC using info from http://support.apple.com/kb/TA24244. The tag I have is a 13.56MHz ISO14443A & NFC Type 2 compliant NTAG216 RFID chipset, and I'm using a ACS ACR122T USB reader. Here's some output from "system.log": 17/01/15 21:04:28,005 com.apple.SecurityServer[71]: reader ACS ACR122U: state changed 16 -> 34 17/01/15 21:04:30,066 com.apple.SecurityServer[71]: token in reader ACS ACR122U cannot be used (error 229) 17/01/15 21:04:33,567 com.apple.SecurityServer[71]: reader ACS ACR122U: state changed 32 -> 18 And from "opensc-tool -l -v": # Detected readers (pcsc) Nr. Card Features Name 0 Yes ACS ACR122U 3b:8f:xx:yy:zz Unsupported card Best regards, Henrik