通常pac包含制定访问控制决策所需的授权信息。
Usually PAC carries the authorization information that is used to make access-control decision.
为实现信息系统的安全目标，需要系统能够提供相关的安全服务：身份标识与认证服务、授权与访问控制服务、非否认服务、机密性服务、完整性服务。
Services such as identification and authentication, authority and access control, non-deniability, confidentiality and integrity are the key elements for the security of the information system.
网络信息安全技术一般包括身份认证、授权控制、审计、数据保密和数据完整性等几个方面。
The network information security technique commonly includes authentication, authorization, audit, data privacy, data integrity and so on.
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