3GPP42.017Functional characteristicsSubscriber Identity Module (SIM)TS
For the purposes of the present document, the following terms and definitions apply. For further information and abbreviations refer to GSM 01.02  and GSM 01.04 .
cipher Key: A key used in conjunction with an algorithm (A5) to cipher user and signalling data (see GSM 03.20 ).
GSM application: A set of security mechanisms, files, data and protocols required by GSM.
IC card SIM: Obsolete term for ID‑1 SIM.
ID‑1 SIM: The SIM having the format of an ID‑1 card (see ISO/IEC 7816‑1 ).
plug-in SIM: A second format of SIM (specified in clause 4).
For the purposes of the present document, the following abbreviations apply:
A3 Algorithm 3, authentication algorithm; used for authenticating the subscriber
A5 Algorithm 5, cipher; used for enciphering/deciphering data
A8 Algorithm 8, cipher key generator; used to generate Kc
ADN Abbreviated Dialling Number
BCCH Broadcast Control CHannel
CCITT The International Telegraph and Telephone Consultative Committee (now also known as ITU Telecommunications Standardization sector)
CHV Card Holder Verification information; access condition used by the SIM for the verification of the identity of the user. The GSM SIM contains two CHVs: CHV1 is the primary access control mechanism, and CHV2 allowing a different level of access.
FDN Fixed Dialling Number
HPLMN Home PLMN
IC Integrated Circuit
IEC International Electrotechnical Commission
IMSI International Mobile Subscriber Identity
Kc cryptographic key; used by the cipher, A5
Ki subscriber authentication key; the cryptographic key used by the authentication algorithm, A3, and cipher key generator, A8
LAI Location Area Information; information indicating a cell or a set of cells
LND Last Number Dialled
ME Mobile Equipment
MMI Man Machine Interface
MS Mobile Station
MSISDN Mobile Station international ISDN number
PLMN Public Land Mobile Network
SIM Subscriber Identity Module
SMS Short Message Service
SSC Supplementary Service Control string
TMSI Temporary Mobile Subscriber Identity
Unblock CHV1/2 value to unblock CHV1/CHV2