Ownership of files in Linux and access authority are closely related to user ids and groups, so let's review some basic user and group information.

Linux 的文件所有权和访问授权是与用户 id 和组密切相关的，所以我们要复习一下基本的用户和组信息。

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NOTE Access implies a decision regarding the permission to review the documented information only, or the permission and authority to view and change the documented information, etc.

注获得表明针对评审文件化信息的许可的决定，或者查看和更改文件化信息的许可和授权等。

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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.

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。

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The Financial Services Authority has now added its own view of what went wrong, with more access to information than others.

BBC: Abdication at the Royal Bank

And Lord Blencathra, the Conservative chair of the committee, urged ministers to restrict the number of organisations that could have designated access to the information to the intelligence services, the police and the Financial Services Authority and a handful of others.

BBC: Computer keyboard and mouse