SAS (GSMA Security Accreditation Scheme)

SAS in context

The mobile core carries subscriber sessions, mobility and policy. In 4G it is the EPC (MME, HSS, S/PGW); in 5G it is the Service-Based Architecture with AMF, SMF, UPF, AUSF, UDM and the NRF.

Subscriber identifiers (IMSI, SUPI, MSISDN, IMEI) anchor authentication, charging and lawful interception. Any protocol that leaks a permanent identifier is treated as a privacy defect, which is why 5G introduced SUCI concealment on the air interface.

To place SAS in the wider telecom-security picture, review eSIM (Embedded SIM, eUICC), NESAS, EIR, Cryptography, Encryption and SECA: each entry cross-references back to this page so you can walk the topic in either direction.

Related terms

• eSIM (Embedded SIM, eUICC)
• NESAS
• EIR
• Cryptography
• Encryption
• SECA
• SEPP
• SIM

Related topic hubs

• Telecom Security Audit Structured MNO/MVNO security audit methodology.
• SS7 Penetration Testing Interconnect pentest methodology for SS7 signaling.
• SIM Swap Attack SIM swap fraud, port-out and account takeover risk.
• Telecom Penetration Testing End-to-end telecom pentest across signaling, radio and core.

More from the TelcoSec Glossary

Browse the full TelcoSec Glossary, the Ultimate Guide to Mobile Network Security, or the P1 Arsenal of telecom-security tools.