name: IK
full_form: Integrity Key
context: The integrity key IK is 128 bits long. There may be one IK for CS connections (IKCS), established between the CS service domain and the user and one IK for PS connections (IKPS) established between the PS service domain and the user. Which integrity key to use for a particular connection is described in 6.5.5. For UMTS subscribers IK is established during UMTS AKA as the output of the integrity key derivation function f4, that is available in the USIM and in the HLR/AuC. For GSM subscribers, that access the UTRAN, IK is established following GSM AKA and is derived from the GSM cipher key Kc, as described in 6.8.2. IK is stored in the USIM and a copy is stored in the ME. IK is sent from the USIM to the ME upon request of the ME. The USIM shall send IK under the condition that a valid IK is available. The ME shall trigger a new authentication procedure if the current value of STARTCS or STARTPS in the USIM are not up-to-date or STARTCS or STARTPS have reached THRESHOLD. The ME shall
description: The Integrity Key (IK) is a critical network attribute used for ensuring the integrity of data transmission between the user equipment and the network. It is established during authentication procedures, such as UMTS AKA or GSM AKA, and is stored in both the USIM and ME.
explanation: The context explicitly describes IK as an integrity key used for securing connections, which aligns with the definition of a Parameter in the telecommunications domain.
section_title: 6.5.4.2	IK
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