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    Circuit security
    145.
    发明公开
    Circuit security 有权
    Schaltungssicherheit

    公开(公告)号：EP1832996A1

    公开(公告)日：2007-09-12

    申请号：EP06251192.8

    申请日：2006-03-06

    Applicant: STMicroelectronics Limited

    Inventor： Ryan, Stuart Andrew ,  Jones, Andrew Michael

    IPC: G06F21/00

    CPC classification number: G06F21/51

    Abstract: A system is provided in which a first circuit is protected by security features provided by a second circuit. The first circuit comprises a processor which retrieves content from a memory. Initially, the contents of the memory are authenticated using security features of the second circuit to check that the processor is accessing authenticated content. To maintain security during use, the second circuit checks that the processor is accessing content from valid regions of the memory, being those that have been authenticated, and re-checks the authenticity of the content of the valid regions of memory. The combination of checking that the processor is accessing from valid regions of the memory and authenticating the content stored in the valid regions maximises the security of the system. If any of the checking or authentication steps fail then operation of the system is impaired. The first circuit is thus protected by security features provided by the second circuit.

    Abstract translation: 提供了一种系统，其中由第二电路提供的安全特征来保护第一电路。 第一电路包括从存储器检索内容的处理器。 最初，使用第二电路的安全特征对存储器的内容进行认证，以检查处理器是否访问认证的内容。 为了在使用期间保持安全性，第二电路检查处理器是否从存储器的有效区域访问内容，即已经被认证的那些内容，并重新检查存储器的有效区域的内容的真实性。 检查处理器从存储器的有效区域进行访问并认证存储在有效区域中的内容的组合使得系统的安全性最大化。 如果任何检查或认证步骤失败，则系统的操作受损。 因此，第一电路由第二电路提供的安全特性来保护。

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