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    • 65. 发明授权
    • Method and apparatus for securing executable programs against copying
    • 用于保护可执行程序免于复制的方法和装置
    • US5675645A
    • 1997-10-07
    • US423402
    • 1995-04-18
    • Edward L. SchwartzMichael J. Gormish
    • Edward L. SchwartzMichael J. Gormish
    • G06F1/00G06F21/00H04L9/00
    • G06F21/123G06F2221/2107
    • A secure system for executing program code in an insecure environment while making it impossible, or at least impractical, to determine how to copy the program code and associated data is provided. A program memory contains encrypted program data and security circuitry contained within an integrated circuit is provided for decrypting the program data as it is needed by a processor. A portion of the processing steps which would be done by the processor in an insecure system is performed in this secure system within the secure circuitry using portions of the decrypted program data which are not provided to the processor. Program data is parsed it out based on a proper request to the security chip from the processor. A key value stored in volatile memory is used in the decrypting process and the volatile memory is positioned on the integrated circuit such that its contents are lost before a chip peel provides access to the volatile memory.
    • 提供了一种用于在不安全环境中执行程序代码的安全系统,同时使得不可能或至少不切实际地确定如何复制程序代码和相关联的数据。 程序存储器包含加密的程序数据,并且集成电路中包含的安全电路被提供用于对处理器需要的程序数据进行解密。 在安全电路中的该安全系统中,使用未提供给处理器的解密程序数据的部分,在不安全系统中由处理器完成的处理步骤的一部分被执行。 程序数据根据从处理器向安全芯片的适当请求进行解析。 在解密处理中使用存储在易失性存储器中的键值,并且易失性存储器位于集成电路上,使得在芯片剥离提供对易失性存储器的访问之前其内容丢失。