One 5G frame, two security contexts — reading a decrypted NR attach

A 5G radio capture can be encrypted twice over, by two separate networks holding two different sets of keys. Wireshark work-item 19757 published a 5G NR trace together with the UE's keys, which makes it an unusually honest capture to learn from: 151 frames over about 49 seconds, taken at the MAC layer of a single cell, with radio security...