A Discrete Model of IEEE 1588-2008 Precision Time Protocol with Clock Servo using PI Controller

2019 ◽  
Author(s):  
Ryuichiro Maegawa ◽  
Daiki Matsui ◽  
Yasuhiro Yamasaki ◽  
Hiroyuki Ohsaki
Keyword(s):  
Discrete Model ◽  
Pi Controller ◽  
Ieee 1588 ◽  
Precision Time ◽  
Precision Time Protocol

scholarly journals Cyber Attacks on Precision Time Protocol Networks—A Case Study

Electronics ◽  
2020 ◽  
Vol 9 (9) ◽  
pp. 1398
Author(s):  
Waleed Alghamdi ◽  
Michael Schukat
Keyword(s):  
Time Synchronization ◽  
Cyber Attacks ◽  
Ieee 1588 ◽  
Advanced Persistent Threats ◽  
Man In The Middle ◽  
Attack Patterns ◽  
Precision Time ◽  
The Impact ◽  
Precision Time Protocol

The IEEE 1588 precision time protocol (PTP) is used by many time-sensitive applications and systems, as it achieves sub-microsecond time synchronization between computer clocks. However, a PTP network is vulnerable to cyber-attacks that can reduce the protocol accuracy to unacceptable levels for some or all clocks in a network with potentially devastating consequences. Of particular concern are advanced persistent threats (APT), where an actor infiltrates a network and operates stealthily and over extended periods of time before being discovered. This paper investigates the impact of the most important APT strategies on a PTP network, i.e., the delay attack, packet modification or transparent clock attack, and time reference attack, using a fully programable and customizable man in the middle device, thereby considering the two most popular PTP slave daemons PTPd and PTP4l. In doing so, it determines suitable attack patterns and parameters to compromise the time synchronization covertly.

Research and Implementations of the IEEE 1588 Precision Time Protocol Based on ARM-Linux

2010 ◽  
Vol 156-157 ◽  
pp. 1492-1496
Author(s):  
Guang You Yang ◽  
Zhi Jian Ye ◽  
Shuang Qing Zhang ◽  
Wan Xu
Keyword(s):  
Control System ◽  
Distributed Control ◽  
Clock Synchronization ◽  
Distributed Control System ◽  
Clock Frequency ◽  
Ieee 1588 ◽  
Working Principle ◽  
Precision Time ◽  
Specialized Hardware ◽  
Precision Time Protocol

The clock synchronization is the key technology in distributed control system. This paper investigates the method to adjust computer clock frequency and time in embedded control system based on Ethernet. This paper also analyses the basic working principle of the IEEE 1588 Precision Time Protocol. In particular, it outlines the working principle of the free PTPd that is the software only implementations of the IEEE 1588 Precision Time Protocol. In the ARM-Linux environment, it presents a clock synchronization method to achieve high precise clock synchronization in distributed control system using PTPd. The results indicate that it is able to synchronize distributed clocks with the accuracy less than 500 microseconds using PTPd without the support of specialized hardware.

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