Section: 10.5.3.1.1 Authentication Parameter AUTN (UMTS and EPS authentication challenge)
Content: The purpose of the Authentication Parameter AUTN information element is to provide the MS with a means of authenticating the network. The Authentication Parameter AUTN information element is coded as shown in figure 10.5.75.1/3GPP TS 24.008[ Mobile radio interface Layer 3 specification; Core network protocols; Stage 3 ]  and table 10.5.89.1/3GPP TS 24.008[ Mobile radio interface Layer 3 specification; Core network protocols; Stage 3 ] . The Authentication Parameter AUTN is a type 4 information element with a length of 18 octets. Figure 10.5.75.1/3GPP TS 24.008[ Mobile radio interface Layer 3 specification; Core network protocols; Stage 3 ]  Authentication Parameter AUTN information element (UMTS and EPS authentication challenge) Table 10.5.89.1/3GPP TS 24.008[ Mobile radio interface Layer 3 specification; Core network protocols; Stage 3 ]  Authentication Parameter AUTN information element (UMTS and EPS authentication challenge)