5G • Security
K_NASenc
NAS Encryption Key
128-bit or 256-bit symmetric ciphering key protecting Non-Access Stratum signaling across the N1 interface.
Technical Explanation
K_NASenc is derived by the UE and AMF from K_AMF using a KDF with the selected 5G encryption algorithm ID (NEA0, 128-NEA1, 128-NEA2, 128-NEA3). It encrypts all sensitive NAS messages (registration, identity, PDU session requests) between UE and AMF.
Key Functions
- Encrypts NAS signaling messages over the N1 interface
- Protects user privacy and session requests from over-the-air eavesdropping
- Supports 128-bit and 256-bit AES, SNOW 3G, and ZUC algorithms
Specifications
3GPP TS 33.501
Interfaces
N1
Related 5G Concepts
Want to memorize 5G concepts like this one?
Study it with SuperMemo SM-2 spaced repetition flashcards.