信息技术 系统间远程通信和信息交换 专用综合业务网 规范、功能模型和信息流 无线终端鉴别辅助服务(WTAT和WTAN

[中文适用范围]： 本国际标准规定了认证补充业务，适用于专用综合业务网络（PISN）支持的各种基础业务。 ISO/IEC 11574 中规定了基本服务。 WTM 用户身份验证 (SS-WTAT) 是一项补充服务，它使 PISN 作为安全措施能够验证 WTM 用户提供的身份。 PISN 身份验证 (SS-WTAN) 是一项补充服务，作为一项安全措施，使所服务的 WTM 用户能够验证 PISN 的身份。 这些补充服务中使用的机制基于身份验证的质询和响应方法。 这两个补充服务（SS-WTAT 和 SS-WTAN）使用的认证算法不属于本国际标准的范围。 本国际标准提供了传达安全参数的信息流。 根据 CCITT 建议 I.130 中描述的方法，补充服务规范分三个阶段产生。 本国际标准包含SS-WTAT和SS-WTAN的第一阶段和第二阶段规范。 第一阶段规范（第 6 条和第 7 条）规定了 PISN 用户所看到的补充服务。 第 2 阶段规范（第 8 条和第 9 条）标识了补充服务中涉及的功能实体以及它们之间的信息流。 [外文原描述]： This International Standard specifies the Authentication supplementary services, which are applicable to various basic services supported by Private Integrated Services Networks (PISN). Basic services are specified in ISO/IEC 11574. Authentication of a WTM user (SS-WTAT) is a supplementary service that enables a PISN, as a security measure, to validate the identity provided by the WTM user. Authentication of the PISN (SS-WTAN) is a supplementary service that enables a served WTM user, as a security measure, to validate the identity of the PISN. The mechanisms used in these supplementary services are based on the challenge and response method of authentication. Authentication algorithms to be used by these two supplementary services (SS-WTAT and SS-WTAN) are outside the scope of this International Standard. This International Standard provides the information flows to convey the security parameters. Supplementary service specifications are produced in three stages, according to the method described in CCITT Recommendation I.130. This International Standard contains the stage 1 and stage 2 specifications of SS-WTAT and SS-WTAN. The stage 1 specification (clause 6 and 7) specifies the supplementary service as seen by users of PISNs. The stage 2 specification (clause 8 and 9) identifies the functional entities involved in the supplementary service and the information flows between them.