name: RES
full_form: RESponse
context: PWS Security and hence there is no need to fall back to GSM AKA for the protection of PWS keys. This prevents an attacker forcing a UE to fall back to GSM AKA in order to be able to deliver a false PWS key. Secondly, in response to a challenge requesting it to establish the enhanced security context, the UE does not respond with RES but rather with an enhanced response derived from CK and IK. When the core network receives such a response, it will not release CK and IK to the RAN nodes. Similarly, the UE will only accept PWS keys when protected using a security context where it returned the enhanced response. This means that an attacker that breaks into a RAN node would not be able to get CK and IK unless RES can be provided to the core network. An attacker deploying a false GSM BS could get 32 bit of information about RES due to the way that the GSM response is calculated from the UMTS response (X) RES (see TS 33.102 [8]). Hence the level of security provided by this is 32 bits less
description: A signaling data exchanged between network components, specifically a response to a challenge requesting the establishment of an enhanced security context.
explanation: The context explicitly mentions 'in response to a challenge' and describes how the UE responds with RES or an enhanced response derived from CK and IK. This indicates that RES is a type of message exchanged for authentication purposes.
section_title: 7.5.1	High level solution discussion
biotag_Context: B-Service,O,O,O,O,O,O,O,O,O,O,O,B-Network,B-Protocol,O,O,O,O,B-Service,O,O,O,O,O,O,O,B-Device,O,O,O,O,B-Network,B-Protocol,O,O,O,O,O,O,O,O,O,B-Service,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Device,O,O,O,O,B-Message,O,O,O,O,O,O,O,O,B-Parameter,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Parameter,O,B-Parameter,O,O,B-Network,O,O,O,B-Device,O,O,O,B-Service,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Network,O,O,O,O,O,O,O,B-Parameter,O,B-Parameter,O,B-Message,O,O,O,O,O,O,O,O,O,O,O,O,B-Network,B-Network Function,O,O,O,O,O,O,O,B-Message,O,O,O,O,O,O,B-Network,O,O,O,O,O,B-Technology,O,O,B-Message,O,B-Specification,O,O,O,O,O,O,O,O,O,O,O,O,O,O
biotag_Description: O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O