3 Definitions and abbreviations

3GPP42.017Functional characteristicsSubscriber Identity Module (SIM)TS

3.1 Definitions

For the purposes of the present document, the following terms and definitions apply. For further information and abbreviations refer to GSM 01.02 [1] and GSM 01.04 [2].

cipher Key: A key used in conjunction with an algorithm (A5) to cipher user and signalling data (see GSM 03.20 [9]).

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 [13]).

plug-in SIM: A second format of SIM (specified in clause 4).

3.2 Abbreviations

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


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