Cryptography

Cryptography is the mathematical discipline that provides confidentiality, integrity, authentication, and non-repudiation through algorithms and key material. Modern cryptography spans symmetric ciphers, hash functions, public-key systems, key-exchange protocols, and post-quantum candidates, and underpins every meaningful telecom security control from SIM authentication to inter-PLMN signalling protection.

Categories: Core NetworkRoaming and InterconnectIdentity and Subscriber

Cryptography 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.

Roaming and interconnect are where two operators exchange signaling and user-plane traffic. Trust boundaries here are the primary attack surface for location tracking, SMS interception and fraud, which is why GSMA now mandates SEPP with PRINS on 5G interconnect.

To place Cryptography in the wider telecom-security picture, review Encryption, Confidentiality, GMSC, GSMA, IAMF and NIST: each entry cross-references back to this page so you can walk the topic in either direction.

Related terms

Related topic hubs

  • Roaming Security IPX/GRX interconnect risk, home-routed vs local-breakout, SEPP.
  • Diameter Security 4G/LTE Diameter threats across IPX/roaming and DEA defenses.
  • 6G Security Emerging 6G threat model, AI/ML surfaces and post-quantum concerns.
  • SEPP Security N32-c/N32-f, PRINS, JWE and OAuth 2.0 at the 5G roaming edge.

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.