Pub Date : 2016-09-01DOI: 10.1109/ISPCS.2016.7579500
J. Bazerque, A. Bevc
Implementing the process bus (PB) constitutes a milestone in the deployment of smart-grids. It provides the protection and monitoring devices of a busbar with synchronized digital samples of voltages and currents that are collected at the bays and communicated across the power substation (PS). One major deterrent for the implementation of the PB is the absence of a standard technology for the coordination of time sources within the PS. Proprietary IRIG-B and pulse-per-second (PSS) coordination schemes have been developed, which do not take advantage of the ethernet deployed for the PB. The precision time protocol (PTP) offers a packet-based solution for synchronization, but does not capitalize on the full information provided by the multiple PS clocks, and it suffers of the time-jump effect when grandmasters are switched. We propose a coordination method to average time references in a PS of campus scale, utilizing components of the PTP standard for interoperability and legacy compatibility. The main novelty of the paper is the incorporation of sparsity-aware statistical tools for outlier rejection that result in an automatic rule to include or discard the references received from each master clock.
{"title":"Robust coordinated time for power substation networks via ℓ1-norm regularization","authors":"J. Bazerque, A. Bevc","doi":"10.1109/ISPCS.2016.7579500","DOIUrl":"https://doi.org/10.1109/ISPCS.2016.7579500","url":null,"abstract":"Implementing the process bus (PB) constitutes a milestone in the deployment of smart-grids. It provides the protection and monitoring devices of a busbar with synchronized digital samples of voltages and currents that are collected at the bays and communicated across the power substation (PS). One major deterrent for the implementation of the PB is the absence of a standard technology for the coordination of time sources within the PS. Proprietary IRIG-B and pulse-per-second (PSS) coordination schemes have been developed, which do not take advantage of the ethernet deployed for the PB. The precision time protocol (PTP) offers a packet-based solution for synchronization, but does not capitalize on the full information provided by the multiple PS clocks, and it suffers of the time-jump effect when grandmasters are switched. We propose a coordination method to average time references in a PS of campus scale, utilizing components of the PTP standard for interoperability and legacy compatibility. The main novelty of the paper is the incorporation of sparsity-aware statistical tools for outlier rejection that result in an automatic rule to include or discard the references received from each master clock.","PeriodicalId":284489,"journal":{"name":"2016 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control, and Communication (ISPCS)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122806156","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-09-01DOI: 10.1109/ISPCS.2016.7579511
Bob Noseworthy
A system is proposed by which a link partner on a path with known latency and asymmetry can directly observe the time error of the attached slave PTP device, including offset from master as well as ingress and egress latency on the port. A qualified system implementing the proposed solution can provide application-independent real-time network based monitoring to assess a time sensitive networks / cyber-physical system's quality of time at the monitored slave nodes.
{"title":"Network-based application-independent time-error and direct port latency measurement","authors":"Bob Noseworthy","doi":"10.1109/ISPCS.2016.7579511","DOIUrl":"https://doi.org/10.1109/ISPCS.2016.7579511","url":null,"abstract":"A system is proposed by which a link partner on a path with known latency and asymmetry can directly observe the time error of the attached slave PTP device, including offset from master as well as ingress and egress latency on the port. A qualified system implementing the proposed solution can provide application-independent real-time network based monitoring to assess a time sensitive networks / cyber-physical system's quality of time at the monitored slave nodes.","PeriodicalId":284489,"journal":{"name":"2016 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control, and Communication (ISPCS)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124302126","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-09-01DOI: 10.1109/ISPCS.2016.7579505
S. Meier
Wireless communication is one of the key topics in the time of internet of things (IOT) and industry 4.0. Every sensor or actor should be smart and able to communicate over a network and in many cases a wired network is not an option. For the use in industrial and measurement and control networks, the devices have to be synchronized via the wireless link as well. There are many different wireless technologies, most of them are radio based and not deterministic (reflections, retransmission, etc.) which makes them quite challenging for implementing the Precision Time Protocol (PTP). Instead of using radio based communication also free-space optical (FSO) communication e.g. infrared can be used. Serial infrared (SIR) is a very simple, short-range, limited-bandwidth, low-power, cheap and deterministic method to transfer data via a Universal Asynchronous Receiver Transmitter (UART) like protocol between multiple infrared nodes. The combination of PTP with SIR has been studied in this paper. Especially the timestamping and encapsulation of PTP frames has been analyzed in detail. An experimental implementation based on an FPGA transceiver is outlined and synchronization accuracy measurements done with different spacing between two nodes. Experimental results are presented that show that sub-microsecond synchronization via a wireless link can be achieved and that free-space optical communication can be an equally useful approach compared to radio communication if it comes to low-bandwidth, short-range wireless communication.
{"title":"Wireless IEEE1588 over an infrared interface","authors":"S. Meier","doi":"10.1109/ISPCS.2016.7579505","DOIUrl":"https://doi.org/10.1109/ISPCS.2016.7579505","url":null,"abstract":"Wireless communication is one of the key topics in the time of internet of things (IOT) and industry 4.0. Every sensor or actor should be smart and able to communicate over a network and in many cases a wired network is not an option. For the use in industrial and measurement and control networks, the devices have to be synchronized via the wireless link as well. There are many different wireless technologies, most of them are radio based and not deterministic (reflections, retransmission, etc.) which makes them quite challenging for implementing the Precision Time Protocol (PTP). Instead of using radio based communication also free-space optical (FSO) communication e.g. infrared can be used. Serial infrared (SIR) is a very simple, short-range, limited-bandwidth, low-power, cheap and deterministic method to transfer data via a Universal Asynchronous Receiver Transmitter (UART) like protocol between multiple infrared nodes. The combination of PTP with SIR has been studied in this paper. Especially the timestamping and encapsulation of PTP frames has been analyzed in detail. An experimental implementation based on an FPGA transceiver is outlined and synchronization accuracy measurements done with different spacing between two nodes. Experimental results are presented that show that sub-microsecond synchronization via a wireless link can be achieved and that free-space optical communication can be an equally useful approach compared to radio communication if it comes to low-bandwidth, short-range wireless communication.","PeriodicalId":284489,"journal":{"name":"2016 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control, and Communication (ISPCS)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121179272","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-09-01DOI: 10.1109/ISPCS.2016.7579503
M. Weiss, L. Cosart, J. Hanssen, J. Yao
There is a need to back up critical timing infrastructure at the national level. This paper provides an update on a joint project employing commercial equipment to send national timing signals through a telecommunication network in the United States. This experiment connects the UTC(NIST) time scale located in Boulder, Colorado with the UTC(USNO) Alternate Master Clock time scale located at Schriever Air Force Base in Colorado via a telecommunication provider's optical network. Timing signals using the Precision Time Protocol(PTP) were sent in the usual two-way fashion, but each one-way delay was measured, because we had UTC time scales at both ends of the network that were within 10 ns of each other. This part of the experiment is now nearly complete. The experiment was started in April 2014 and extensions of the project will run through the end of 2016. It appears that there is at least one commercial transport mechanism that could serve to back up GPS for time transfer at the 100 ns level. We found that the asymmetry of the PTP time transfer resulted in 10's of microseconds of time transfer error, but that the stability through the entire connection was less than 100 ns, as long as the connection remained complete. This implies that if the time delays of the network could be calibrated, it could maintain under 100 ns accuracy as long as it did not go down. We have established the likely causes of the bias, as well as run simulations of various configurations in a laboratory. Thus, we have some certainty that similar results will apply if this technique were used as a service across the country. While many researchers have shown that fiber can transfer time and frequency with high accuracy, this experiment addresses the practicality of using the US telecom infrastructure for timing.
{"title":"Precision time transfer using IEEE 1588 over OTN through a commercial optical telecommunications network","authors":"M. Weiss, L. Cosart, J. Hanssen, J. Yao","doi":"10.1109/ISPCS.2016.7579503","DOIUrl":"https://doi.org/10.1109/ISPCS.2016.7579503","url":null,"abstract":"There is a need to back up critical timing infrastructure at the national level. This paper provides an update on a joint project employing commercial equipment to send national timing signals through a telecommunication network in the United States. This experiment connects the UTC(NIST) time scale located in Boulder, Colorado with the UTC(USNO) Alternate Master Clock time scale located at Schriever Air Force Base in Colorado via a telecommunication provider's optical network. Timing signals using the Precision Time Protocol(PTP) were sent in the usual two-way fashion, but each one-way delay was measured, because we had UTC time scales at both ends of the network that were within 10 ns of each other. This part of the experiment is now nearly complete. The experiment was started in April 2014 and extensions of the project will run through the end of 2016. It appears that there is at least one commercial transport mechanism that could serve to back up GPS for time transfer at the 100 ns level. We found that the asymmetry of the PTP time transfer resulted in 10's of microseconds of time transfer error, but that the stability through the entire connection was less than 100 ns, as long as the connection remained complete. This implies that if the time delays of the network could be calibrated, it could maintain under 100 ns accuracy as long as it did not go down. We have established the likely causes of the bias, as well as run simulations of various configurations in a laboratory. Thus, we have some certainty that similar results will apply if this technique were used as a service across the country. While many researchers have shown that fiber can transfer time and frequency with high accuracy, this experiment addresses the practicality of using the US telecom infrastructure for timing.","PeriodicalId":284489,"journal":{"name":"2016 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control, and Communication (ISPCS)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131498553","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-09-01DOI: 10.1109/ISPCS.2016.7579508
Carlos Augusto Machado Monteiro, C. L. de Souza, M. Dalmas
Synchronization measurement is very useful for power systems on phase measurement, fault location detection and others. This paper describes the concept of a frequency generator module to be used on synchronized acquisition systems. The frequency generator is modeled using a Numeric Controlled Oscillator (NCO) and a PI controller feeding back with phase error of one pulse per second (1-pps) output. The synchronization uses 1-pps from a GNSS as a reference for the synchronization system.
{"title":"Global sample synchronization trigger","authors":"Carlos Augusto Machado Monteiro, C. L. de Souza, M. Dalmas","doi":"10.1109/ISPCS.2016.7579508","DOIUrl":"https://doi.org/10.1109/ISPCS.2016.7579508","url":null,"abstract":"Synchronization measurement is very useful for power systems on phase measurement, fault location detection and others. This paper describes the concept of a frequency generator module to be used on synchronized acquisition systems. The frequency generator is modeled using a Numeric Controlled Oscillator (NCO) and a PI controller feeding back with phase error of one pulse per second (1-pps) output. The synchronization uses 1-pps from a GNSS as a reference for the synchronization system.","PeriodicalId":284489,"journal":{"name":"2016 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control, and Communication (ISPCS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128646339","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-09-01DOI: 10.1109/ISPCS.2016.7579510
T. Koskiahde, J. Kujala
Redundant Ethernet topologies such as Rapid Spanning Tree Protocol (RSTP), High-availability Seamless Redundancy (HSR) and Parallel Redundancy Protocol (PRP) are used in automation systems. Commonly Precision Time Protocol (PTP) is used to synchronize nodes in such networks. The redundant topology can be utilized to monitor PTP functionality - such as to detect asymmetries, non-functional devices and to help during installation and operation.
冗余以太网拓扑包括RSTP (Rapid Spanning Tree Protocol)、HSR (High-availability Seamless Redundancy)和PRP (Parallel Redundancy Protocol)。通常使用PTP (Precision Time Protocol)协议对此类网络中的节点进行同步。冗余拓扑可用于监视PTP功能，例如检测不对称、非功能设备，并在安装和操作期间提供帮助。
{"title":"PTP monitoring in redundant network","authors":"T. Koskiahde, J. Kujala","doi":"10.1109/ISPCS.2016.7579510","DOIUrl":"https://doi.org/10.1109/ISPCS.2016.7579510","url":null,"abstract":"Redundant Ethernet topologies such as Rapid Spanning Tree Protocol (RSTP), High-availability Seamless Redundancy (HSR) and Parallel Redundancy Protocol (PRP) are used in automation systems. Commonly Precision Time Protocol (PTP) is used to synchronize nodes in such networks. The redundant topology can be utilized to monitor PTP functionality - such as to detect asymmetries, non-functional devices and to help during installation and operation.","PeriodicalId":284489,"journal":{"name":"2016 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control, and Communication (ISPCS)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133759582","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-09-01DOI: 10.1109/ISPCS.2016.7579506
H. Troger, Jakob Drexel, Alexej Jarresch, L. Patino-Studencki, A. Heuberger
The most promising way of bringing localization services to GPS denied areas is the use of wireless sensor networks. The attainable accuracy for many methods of localization is highly depending on the synchronization between the sensor nodes. In this paper we describe a concept of adjusting the frequency of the local clocks with the help of signals of opportunity. It is explained, how broadcast signals can be used as a wireless reference signal for this syntonization process. We characterize the syntonization accuracy with the help of time domain analysis techniques (e.g. Allan Deviation). The measurements are carried out with a new low-cost test-bed using a software-defined radio hardware platform and the open source software GNU Radio. Using this measurement setup we characterize the wireless syntonization performance between two sensor nodes.
{"title":"Characterization of an opportunistic wireless syntonization using a low-cost test-bed","authors":"H. Troger, Jakob Drexel, Alexej Jarresch, L. Patino-Studencki, A. Heuberger","doi":"10.1109/ISPCS.2016.7579506","DOIUrl":"https://doi.org/10.1109/ISPCS.2016.7579506","url":null,"abstract":"The most promising way of bringing localization services to GPS denied areas is the use of wireless sensor networks. The attainable accuracy for many methods of localization is highly depending on the synchronization between the sensor nodes. In this paper we describe a concept of adjusting the frequency of the local clocks with the help of signals of opportunity. It is explained, how broadcast signals can be used as a wireless reference signal for this syntonization process. We characterize the syntonization accuracy with the help of time domain analysis techniques (e.g. Allan Deviation). The measurements are carried out with a new low-cost test-bed using a software-defined radio hardware platform and the open source software GNU Radio. Using this measurement setup we characterize the wireless syntonization performance between two sensor nodes.","PeriodicalId":284489,"journal":{"name":"2016 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control, and Communication (ISPCS)","volume":"212 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133576925","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-09-01DOI: 10.1109/ISPCS.2016.7579512
T. Kovácsházy
Packed-based precision time synchronization is a fundamental enabling technology of modern distributed measurement and control systems. Today IEEE 1588 and derivative solutions such as IEEE 802.1AS can be considered stable technologies with wide scale support from manufacturers, and new technologies built upon them also, such as dependable, real-time communication over Ethernet (Time Sensitive Networking, TSN). However, properties of such solutions in their synchronized state; when error signals tend to be small and close to the minimum value for their numerical representation, is not well-understood, especially in complex systems configurations using several transparent clocks connecting the master clock to slave clocks. In the paper a quantization and sampling based initial approach is introduced for such packet-based time synchronization systems taking into account implementation specific details, primarily the used timestamping approach and effects of finite word-length arithmetic units used in computer systems. Based on the model some preliminary analyses results are also shown that verify that this model is applicable.
{"title":"Towards a quantization based accuracy and precision characterization of packet-based time synchronization","authors":"T. Kovácsházy","doi":"10.1109/ISPCS.2016.7579512","DOIUrl":"https://doi.org/10.1109/ISPCS.2016.7579512","url":null,"abstract":"Packed-based precision time synchronization is a fundamental enabling technology of modern distributed measurement and control systems. Today IEEE 1588 and derivative solutions such as IEEE 802.1AS can be considered stable technologies with wide scale support from manufacturers, and new technologies built upon them also, such as dependable, real-time communication over Ethernet (Time Sensitive Networking, TSN). However, properties of such solutions in their synchronized state; when error signals tend to be small and close to the minimum value for their numerical representation, is not well-understood, especially in complex systems configurations using several transparent clocks connecting the master clock to slave clocks. In the paper a quantization and sampling based initial approach is introduced for such packet-based time synchronization systems taking into account implementation specific details, primarily the used timestamping approach and effects of finite word-length arithmetic units used in computer systems. Based on the model some preliminary analyses results are also shown that verify that this model is applicable.","PeriodicalId":284489,"journal":{"name":"2016 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control, and Communication (ISPCS)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127933152","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-09-01DOI: 10.1109/ISPCS.2016.7579513
Milentiy Golovnya, I. Shkliarevskyi, O. Velychko, V. Koval, Oleksii Nikitenko
A conception of National time-scale distribution network, using PTP technology is considered in Ukraine as the most modern one and having large perspectives, since IEEE 1588 based applications are now expanded to be used in many different fields. Paper describes some PTP master-slave implementation results, obtained in a long-distance non-PTP network (rented VPN, Virtual Private Network was used) at different network load levels and in different regions of Ukraine. A conclusion has been made that even in non-PTP network it's possible to provide a time-scale transfer service with millisecond precision in a worst case, what makes it useful just today for Time and Frequency National Laboratories.
{"title":"IEEE 1588 based national time-scale distribution project in Ukraine","authors":"Milentiy Golovnya, I. Shkliarevskyi, O. Velychko, V. Koval, Oleksii Nikitenko","doi":"10.1109/ISPCS.2016.7579513","DOIUrl":"https://doi.org/10.1109/ISPCS.2016.7579513","url":null,"abstract":"A conception of National time-scale distribution network, using PTP technology is considered in Ukraine as the most modern one and having large perspectives, since IEEE 1588 based applications are now expanded to be used in many different fields. Paper describes some PTP master-slave implementation results, obtained in a long-distance non-PTP network (rented VPN, Virtual Private Network was used) at different network load levels and in different regions of Ukraine. A conclusion has been made that even in non-PTP network it's possible to provide a time-scale transfer service with millisecond precision in a worst case, what makes it useful just today for Time and Frequency National Laboratories.","PeriodicalId":284489,"journal":{"name":"2016 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control, and Communication (ISPCS)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130066096","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-03-02DOI: 10.1109/ISPCS.2016.7579501
E. Itkin, A. Wool
The Precision Time Protocol (PTP) aims to provide highly accurate and synchronized clocks. Its defining standard, IEEE 1588, has a security section (“Annex K”) which relies on symmetric-key secrecy. In this paper we present a detailed threat analysis of the PTP standard, in which we highlight the security properties that should be addressed by any security extension. During this analysis we identify a sequence of new attacks and non-cryptographic network-based defenses that mitigate them. We then suggest to replace Annex K's symmetric cryptography by an efficient elliptic-curve Public-Key signatures. We implemented all our attacks to demonstrate their effectiveness, and also implemented and evaluated both the network and cryptographic defenses. Our results show that the proposed schemes are extremely practical, and much more secure than previous suggestions.
{"title":"A security analysis and revised security extension for the precision time protocol","authors":"E. Itkin, A. Wool","doi":"10.1109/ISPCS.2016.7579501","DOIUrl":"https://doi.org/10.1109/ISPCS.2016.7579501","url":null,"abstract":"The Precision Time Protocol (PTP) aims to provide highly accurate and synchronized clocks. Its defining standard, IEEE 1588, has a security section (“Annex K”) which relies on symmetric-key secrecy. In this paper we present a detailed threat analysis of the PTP standard, in which we highlight the security properties that should be addressed by any security extension. During this analysis we identify a sequence of new attacks and non-cryptographic network-based defenses that mitigate them. We then suggest to replace Annex K's symmetric cryptography by an efficient elliptic-curve Public-Key signatures. We implemented all our attacks to demonstrate their effectiveness, and also implemented and evaluated both the network and cryptographic defenses. Our results show that the proposed schemes are extremely practical, and much more secure than previous suggestions.","PeriodicalId":284489,"journal":{"name":"2016 IEEE International Symposium on Precision Clock Synchronization for Measurement, Control, and Communication (ISPCS)","volume":"247 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132703076","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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