OpenSSL

OpenSSL is the most widely deployed open-source cryptographic library, providing TLS 1.0 through 1.3, X.509, symmetric and asymmetric primitives, and command-line tooling. It runs in everything from web servers to 5G core network functions and embedded telecom equipment. Notable historical incidents, Heartbleed (2014), CCS Injection, make OpenSSL patch hygiene a non-negotiable operational practice. OpenSSL 3.x adds a new provider model and a longer-term FIPS-validated module path.

Categories: Core NetworkSecurity ControlsProtocols and Standards

OpenSSL 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.

Security controls span signaling firewalls (SS7/Diameter/GTP screening), transport encryption (IPsec, TLS, PRINS), identity and access on OSS/BSS, and monitoring at both packet and log level. Controls are audited against GSMA FS.11/FS.19/FS.20/FS.36.

To place OpenSSL in the wider telecom-security picture, review AES, N3IWF, TNGF, EAP-AKA′, SEAF and N12 — 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.