TLS (Transport Layer Security)

Transport Layer Security, defined by the IETF (latest TLS 1.3 in RFC 8446), provides confidentiality, integrity, and authentication for client-server communications over TCP. It underpins HTTPS, modern email transport, mTLS in cloud and 5G SBA, and SIP/SMPP security. TLS 1.0 and 1.1 are deprecated and should be disabled; TLS 1.2 is the operational baseline; TLS 1.3 removes legacy ciphers, mandates forward secrecy, and reduces handshake latency. Certificate management and HSTS are critical for end-to-end protection.

Categories: Radio Access NetworkCore NetworkSignaling

TLS in context

The radio access network is where mobile devices attach to the operator's infrastructure. Attacks in this layer include IMSI catching, rogue base stations and downgrade attacks; defenses rest on mutual authentication, integrity-protected signaling and Open RAN supply-chain hygiene.

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.

To place TLS in the wider telecom-security picture, review 5G SA, AMF, Base Station (BS), Capacity Planning, CAPEX and CSCF — each entry cross-references back to this page so you can walk the topic in either direction.

Related terms

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.