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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).

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  1. 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.

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