IIF Interworking without Service Order: Security, Authentication, and SIM Card Details

Feb 05, 2026

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This document presents an overview of IIF interworking with no Service Order (SO). It highlights the critical role of SIM cards in security-related information requests, showcasing the authentication process via AUTHREQ. Key parameters such as RAND, SRES, and Kc are defined, alongside their interaction with GSMSC and IS-41 HLR. The SIM card utilizes CAVE and A8 algorithms to compute AUTHU and SSD-B, integral to maintaining secure communications. Additionally, the minimum necessary parameters for roaming and unique challenge responses are discussed for efficient authentication.

1 iif interworking 2 security information 3 authentication vector 4 sim card details 5 rand sres 6 authentication algorithm 7 gsm hlr 8 unique challenge response text

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IIF Interworking without Service Order: Security, Authentication, and SIM Card Details

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Comments This figure indicates the example of IIF interworking without Service Order (SO). SIM Card *2 Security Related Information Request AUTHREQ *2 *2 authreq Authentication Vector Response GSM MSC (RAND, SRES, Kc) (RANDU, AUTHU) *1 IS-41 HLR IIF RANDU (24bits) AUTHU (18bits) } } This SIM Card includes CAVE and A8 algorithm, and calculate AUTHU and SSD-B. AUTHU is contained in the SRES parameter. The SSD-B acts as Kc (ciphering key). And, this SIM Card contains MIN, ESN, fixed SSD-A and AAV parameter. 128bits 32bits RAND SRES AUTHU : AuthenticationResponseUniqueChallenge RANDU : RandVariableUniqueChallenge AAV : AuthenticationAlgorithmVersion *1 : HLR needs to contain fixed SSD-A for the roamer to GSM. *2 : This message is sent x times.