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    • 4. 发明授权
    • Personal computer system with security features and method
    • 具有安全功能和方法的个人计算机系统
    • US5388156A
    • 1995-02-07
    • US840965
    • 1992-02-26
    • John W. Blackledge, Jr.Grant L. Clarke, Jr.Richard A. DayanKimthanh D. LePatrick E. McCourtMatthew T. MittelstedtDennis L. MoellerPalmer E. NewmanDavid L. RandallJoAnna B. Yoder
    • John W. Blackledge, Jr.Grant L. Clarke, Jr.Richard A. DayanKimthanh D. LePatrick E. McCourtMatthew T. MittelstedtDennis L. MoellerPalmer E. NewmanDavid L. RandallJoAnna B. Yoder
    • G06F11/00G06F9/06G06F12/14G06F21/00G06F21/06G06F21/22G06F21/24H04L9/00
    • G06F21/86G06F2211/009G06F2221/2143
    • This invention relates to personal computer systems and, more particularly, to such a system having security features enabling control over access to data retained in such a system. In particular, a personal computer system in accordance with this invention has a normally closed enclosure, at least one erasable memory element for selective activation to active and inactive states and for receiving and storing a privileged access password when in the active state, an option switch operatively connected with the erasable memory element for setting the erasable memory element to the active and inactive states, a tamper detection switch operatively connected with the erasable memory element for detecting opening of the enclosure and for invalidating any privileged access password stored in the erasable memory element in response to any switching of the tamper switch, and a system processor operatively connected with the erasable memory element for controlling access to at least certain levels of data stored within the system by distinguishing between the active and inactive states of the memory element and between entry and non-entry of any stored privileged access password. In the presently preferred form of the invention, two non-volatile erasable memory elements are provided, one an EEPROM and the other battery backed CMOS RAM.
    • 本发明涉及个人计算机系统,更具体地说,涉及具有能够控制对这种系统中保留的数据的访问的安全特征的这种系统。 特别地,根据本发明的个人计算机系统具有常闭壳体,至少一个可擦除存储器元件,用于选择性地激活到主动和非活动状态,并且在处于活动状态时接收和存储特权访问密码,选项开关 与可擦除存储器元件可操作地连接,用于将可擦除存储器元件设置为活动和非活动状态;篡改检测开关,其可操作地与可擦除存储元件连接,用于检测外壳的打开并使存储在可擦除存储器元件中的任何特权访问密码无效 响应于所述篡改开关的任何切换,以及与所述可擦除存储器元件可操作地连接的系统处理器,用于通过区分所述存储元件的有效和非活动状态以及在进入之间来控制对存储在所述系统内的至少某一级别的数据的访问 并且不输入任何存储的特权访问权限 ss字。 在本发明的当前优选形式中,提供了两个非易失性可擦除存储器元件,一个是EEPROM和另一个电池支持的CMOS RAM。