name: CK
full_form: Cipher Key
context: R99+ ME with a SIM inserted, shall participate only in GSM AKA. GSM AKA results in the establishment of a GSM security context; the GSM cipher key Kc and the cipher key sequence number CKSN are stored in the ME. When the user is attached to a UTRAN, R99+ ME shall derive the UMTS cipher/integrity keys CK and IK from the GSM cipher key Kc using the conversion functions c4 and c5. The ME shall handle the STARTCS and STARTPS as described in section 6.4.8 with the exception that the START values shall be stored in non-volatile memory on the ME rather than on the GSM SIM. If a different SIM is inserted then the ME shall delete the GSM cipher keys for the PS and CS domain (Kc), the derived UMTS cipher/integrity keys (CK and IK) for the PS and CS domain, and reset the START values to zero. The ME shall then trigger a new authentication and key agreement at the next connection establishment by indicating to the network that no valid keys are available for use using the procedure described in section 6.4.4. When the user is attached to a UTRAN, a R99+ ME with a SIM inserted shall use a default value of all ones for maximum value of STARTCS or STARTPS. The ME shall handle the maximum value of STARTCS or STARTPS as described in section 6.4.3 with the exception that the maximum value of STARTCS or STARTPS is stored on the ME rather than on the GSM SIM.
description: The Cipher Key (CK) is a crucial security parameter used in the UMTS system, derived from the GSM cipher key Kc using conversion functions. It plays a vital role in ensuring secure communication between the Mobile Equipment (ME) and the network by encrypting data.
explanation: CK is classified as an Identifier because it serves as a unique code for identifying and securing user data transmission within the UMTS system, aligning with the security architecture specified in 3GPP TS 33.102.
section_title: 6.8.2.4 R99+ ME
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