5G • Security
128-NIA2
AES-CMAC Integrity Protection Algorithm
Integrity algorithm generating 32-bit Message Authentication Codes using Cipher-based MAC (AES-CMAC).
Technical Explanation
128-NIA2 implements AES-CMAC (NIST SP 800-38B). It is the primary integrity protection algorithm deployed by operators worldwide for both NAS signaling across N1 and over-the-air RRC control messages in the PDCP layer.
Key Functions
- Computes 32-bit MAC-I using NIST-standardized AES-CMAC
- Dominant integrity protection standard deployed in global 5G networks
- Prevents message replay and unauthorized command injection
Specifications
3GPP TS 33.501, NIST SP 800-38B
Interfaces
UuN1
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