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5G Fundamentals
In this lab you will decode actual 5G identifiers extracted from sample NAS protocol messages. Starting with a hex-encoded SUCI you will extract each constituent field including the SUPI format indicating whether the identity is an IMSI or NAI, the home network ID containing MCC and MNC, the routing indicator, the protection scheme identifier that specifies null encryption or ECIES Profile A or Profile B, the home network public key ID, and finally the concealed MSIN portion. You will then decode a 5G-GUTI into its GUAMI components and break down a TAI into its PLMN and TAC fields.
Try these first, even if you're not sure. Guessing primes your brain.
A production trace shows the subscriber identity sent with encryption flag set to null. First reaction?
A phone fails to reconnect. Its temporary ID points to a core instance that no longer exists. What happened?
In a mixed 4G/5G trace, the tracking-area field looks shorter in one message. Why?
Answer all 3to continue — it's OK to be wrong.