AKA Linkability Attack

In telecommunications, an AKA Linkability Attack abuses error responses and replay properties of the Authentication and Key Agreement procedure to determine whether a specific subscriber is present in a cell, even when temporary identifiers are used. It impacts 3G, 4G, and certain 5G scenarios depending on implementation.

Categories: Radio Access NetworkIdentity and SubscriberSecurity Controls

AKA Linkability Attack 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.

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 AKA Linkability Attack in the wider telecom-security picture, review 2G, Authentication, IMSI Catcher (Cell Site Simulator), OTA, USIM and WCDMA — each entry cross-references back to this page so you can walk the topic in either direction.

Related terms

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