United We Stand: A Threshold Signature Scheme for Identifying Outliers in PLCs

机译：United We Stand：识别PLC中异常值的阈值签名方案

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This work proposes a scheme to detect, isolate and mitigate malicious disruption of electro-mechanical processes in legacy PLCs where each PLC works as a finite state machine (FSM) and goes through predefined states depending on the control flow of the programs and input-output mechanism. The scheme generates a group-signature for a particular state combining the signature shares from each of these PLCs using $(k, l)$-threshold signature scheme.If some of them are affected by the malicious code, signature can be verified by k out of l uncorrupted PLCs and can be used to detect the corrupted PLCs and the compromised state. We use OpenPLC software to simulate Legacy PLC system on Raspberry Pi and show $I/O$ pin configuration attack on digital and pulse width modulation (PWM) pins. We describe the protocol using a small prototype of five instances of legacy PLCs simultaneously running on OpenPLC software. We show that when our proposed protocol is deployed, the aforementioned attacks get successfully detected and the controller takes corrective measures. This work has been developed as a part of the problem statement given in the Cyber Security Awareness Week-2017 competition.

机译：这项工作提出了一种检测，隔离和减轻旧有PLC中机电过程的恶意破坏的方案，其中每个PLC都作为有限状态机（FSM）起作用，并根据程序和输入输出的控制流程进入预定义状态机制。该方案使用$（k，\\ l）$阈值签名方案为每个PLC的签名份额组合生成特定状态的组签名，如果其中一些受到恶意代码的影响，则可以验证签名在所有未损坏的PLC中，每k个计数器中的k个可以被检测到，并且可用于检测损坏的PLC和受损状态。我们使用OpenPLC软件在Raspberry Pi上模拟Legacy PLC系统，并显示对数字和脉宽调制（PWM）引脚的$ I / O $引脚配置攻击。我们使用同时在OpenPLC软件上运行的五个遗留PLC实例的小型原型来描述协议。我们显示出，当我们提出的协议被部署时，上述攻击会被成功检测到，并且控制器会采取纠正措施。这项工作是作为2017年网络安全意识周竞赛中问题陈述的一部分而开发的。

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来源
《2019 56th ACM/IEEE Design Automation Conference》|2019年|1-2|共2页
会议地点 Las Vegas(US)
作者
Urbi Chatterjee; Pranesh Santikellur; Rajat Sadhukhan; Vidya Govindan; Debdeep Mukhopadhyay; Rajat Subhra Chakraborty;
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作者单位

Indian Institute of Technology Kharagpur, India;

Indian Institute of Technology Kharagpur, India;

Indian Institute of Technology Kharagpur, India;

Indian Institute of Technology Kharagpur, India;

Indian Institute of Technology Kharagpur, India;

Indian Institute of Technology Kharagpur, India;

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原文格式 PDF
正文语种 eng
中图分类
关键词
Pins; Registers; Protocols; Pulse width modulation; Malware; Prototypes; Anomaly detection;

机译：引脚;寄存器;协议;脉冲宽度调制;恶意软件;原型;异常检测;;

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United We Stand: A Threshold Signature Scheme for Identifying Outliers in PLCs

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