防篡改保护您的宝贵的基于MCU的系统IP

　　防篡改保护您的宝贵的基于MCU的系统IP

　　基于MCU的设计可以很容易地添加专门化和差异化的功能，通过编码到设备的算法。一个新的扭曲旧的算法或一个全新的方法可以使成功的产品和失败之间的区别。不幸的是，使用单片机也可以打开你的设计逆向工程，其中一个竞争对手窃取你的辛勤工作和你的创新的好处。当然，律师可以参与，也许报复，但往往只有在损害已经完成。一个更好的方法是保护您的设计免受常见的硬件篡改入侵，用于访问您的代码和窃取您宝贵的知识产权。

　　本文将介绍一些常见的硬件“黑客”的方法来获取您宝贵的设计IP。新的MCU包括几个关键的功能，可以用来放一些障碍来防止硬件篡改。这些防篡改保护设计技术可以成为MCU设计者的技术“技巧的一个重要组成部分。”

　　On-chip tamper prevention： supervisor mode

　　One of the more recent innovations in MCUs has been the inclusion of a feature that has been used in standard CPUs for many years. One of the earliest tamper-prevention features， separating the user-operating mode from the supervisor-operating mode （the supervisor mode is often associated with the operating-system mode in CPUs） has been showing up in MCU devices. This capability allows supervisory software to have privileged access to protected resources while limiting or eliminating access to less privileged user programs. This makes it much more difficult for a hacker to gain control of the system via user software code bugs. Even if a user bug can be used to gain control of the MCU， it will still be stuck in the user mode without access to the most important system elements related to configuration， programming， debugging， and system control.