Curve25519 (X25519 ECDH)

Also known as: X25519, Ed25519

Curve25519 is a Montgomery elliptic curve providing ~128-bit security, used with the X25519 key agreement function (RFC 7748). It is preferred in TLS 1.3, IKEv2 (DH group 31), WireGuard and Noise for its speed, misuse resistance and constant-time implementations. Ed25519 is the companion signature scheme (RFC 8032).

Categories: Security ControlsProtocols and StandardsInternet and Routing

Curve25519 in context

Security controls in telecom span signaling firewalls (SS7/Diameter/GTP screening at the network edge), transport encryption (IPsec, TLS, PRINS), identity and access on OSS/BSS, and monitoring at both the packet and log level. Controls are audited against GSMA FS.11/FS.19/FS.20/FS.36 and, in Europe, NIS2 sectoral rules.

Telecom security is written into standards from 3GPP, GSMA, ETSI, IETF and ITU-T. Understanding which body owns which specification, and how the specs interlock (for example 3GPP TS 33.501 with GSMA FS.34 for 5G SBA security), is essential for both design and audit work.

To place Curve25519 in the wider telecom-security picture, review Digital Signature, SIRT, ML-DSA, SLH-DSA, 3G and A5/1.

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