现今的资料存取控制可精细到个别资料格中的资讯，以便为重要资料及机密客户资讯，提供更严密的安全防护。
Access to data can now be controlled down to an individual cell of information, providing greater security for your critical data and sensitive customer information.
在用户层次结构的动态存取控制问题上，本文提出了一种安全有效的方案。
In the problem of dynamic access control, we present a secure and efficient scheme, which is based on discrete logarithms and polynomial interpolation.
在一些最早的存取控制系统中，人们用角色来分隔安全管理和系统管理。
People use it to separate the management of system from security in the access control system.
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