1746SC-INO4VI

描述

1746SC-INO4VI

在一定程度上，保持系统简单就意味着要智能地再利用已有资源，以避免增加设计的复杂性。每个系统都有“重要安全参数(CSP)”的机密，必须保持其完整性，从而确保系统完好无缺。在智能电表或支付终端中，这一CSP是一个密钥，必须在编程到内存时就得到保护。这就涉及电表多次未通电的情况，通常称为篡改检测。根据攻击者希望得到的最终结果，篡改有多种形式。有时候，黑客仅需要通过破坏设备来中断运行而并不需要盗取CSP就能够实现目标。中断设备运行通常较为简单，因为其可通过多种方式实现。根据智能电网决策者的一项最新调查结果显示，中断设备运行与盗取密钥所带来的后果一样严重或者更糟(图4)。出于这一原因，计量工程师必须像确保安全性那样付出同样多的努力确保电表不会被轻易破坏。因此，每个电表都需要进行加密和篡改检测功能，并且它们需要完美协同工作，以便提供既能减少成本又能使电表在现场运行数十年的出色解决方案。Sentry安全模块正是应对这一挑战的最佳方案，因为存储CSP的理想存储器是在器件当中，这一存储器可与模块内或电表内已有的、用于篡改检测所必需的传感器直接相连。而这些传感器可监控运动、温度、温度变化及磁场，甚至灯光，从而能够帮助防止多种攻击途径。通过将所有这些技术集成到与备用电池安全相连的模块，Sentry安全模块不仅降低了总体功耗，还将所有的关键备份活动集合到单一的优化位置中。这不仅缩小了安全差距，简化了设计考虑因素，还降低了电表其他区域对极低备用电源的需求。

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