1,860 research outputs found
An Oral History Interview with Sean Peisert
No full textAn oral history interview with Dr. Sean Peisert, sponsored by and a part of NSF 2202484 “Mining a Useable Past: Perspective Paradoxes, and Possibilities with Security and Privacy,” at the Charles Babbage Institute, University of Minnesota.This oral history interview with Dr. Sean Peisert begins by briefly exploring Dr. Peisert’s evolving early interests prior to and his first years of college at UCSD, and how he came to focus on computer science, and within computer science earned a Ph.D. at the same institution. As part of this he discusses key mentors and opportunities he had to work with standout computer scientists and computer security specialists early on, and continuing as a peer, to date in his career. This included work at the UCSD Supercomputer Center. He relates his decision to join Berkeley Lab as a Research Scientist at Lawrence Berkeley National Laboratory, and to become an Adjunct Professor in the Computer Science Department at the University of California, Davis. The bulk of the interview focuses on his research in various areas of computer security and privacy such as electronic voting, digital forensics, cybersecurity for energy delivery, intrusion detection systems, privacy and protocols for handling medical data. He discusses history of science, and his repeated penchant for finding ways to combine areas that previously had not been combined to help solve real world problems for government and for society. He also comments on teaching, his leadership with technical committees, the history of the Oakland Conference (IEEE Symposium on Security and Privacy) and his service as General Chair, as well as his work in publishing that included strategic directions he took IEEE Security & Privacy, toward greater currency, and a board with greater gender and geographic diversity.NSFPeisert, Sean. (2026). An Oral History Interview with Sean Peisert. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/277746
Extremal Peisert-type graphs without the strict-EKR property
No full textIt is known that Paley graphs of square order have the strict-EKR property, that is, all maximum cliques are canonical cliques. Peisert-type graphs are natural generalizations of Paley graphs and some of them also have the strict-EKR property. Given a prime power , we study Peisert-type graphs of order without the strict-EKR property and with the minimum number of edges and we call such graphs extremal. We determine number of edges in extremal graphs for each value of . If is a a square or a cube, we show the uniqueness of the extremal graph and classify all maximum cliques explicitly. Moreover, when is a square, we prove that there is no Hilton-Milner type result for the extremal graph, and show the tightness of the weight-distribution bound for both non-principal eigenvalues of this graph.34 pages, final version accepted by JCT
A hybrid network IDS for protective digital relays in the power transmission grid
No full textIn this paper, we propose a novel use of network intrusion detection systems (NIDSs) tailored to detect attacks against networks that support hybrid controllers that implement power grid protection schemes. In our approach, we implement specification-based intrusion detection signatures based on the execution of the hybrid automata that specify the communication rules and physical limits that the system should obey. To validate our idea, we developed an experimental framework consisting of a simulation of the physical system and an emulation of the master controller, which serves as the digital relay that implements the protection mechanism. Our Hybrid Control NIDS (HC-NIDS) continuously monitors and analyzes the network traffic exchanged within the physical system. It identifies traffic that deviates from the expected communication pattern or physical limitations, which could place the system in an unsafe mode of operation. Our experimental analysis demonstrates that our approach is able to detect a diverse range of attack scenarios aimed at compromising the physical process by leveraging information about the physical part of the power system
Hypergeometric functions for Dirichlet characters and Peisert-like graphs on
No full textFor a prime and a positive integer , let .
The Peisert graph of order is the graph with vertex set such
that is an edge if ,
where is a primitive element of . In this paper, we construct
a similar graph with vertex set as the commutative ring for
suitable , which we call \textit{Peisert-like} graph and denote by
. Owing to the need for cyclicity of the group of units of
, we consider or , where is a prime and is a positive integer. For primes , we compute the number of triangles in the graph by
evaluating certain character sums. Next, we study cliques of order 4 in
. To find the number of cliques of order in
, we first introduce hypergeometric functions containing
Dirichlet characters as arguments, and then express the number of cliques of
order in in terms of these hypergeometric functions.Comment: Journal: La Matematica (accepted for publication
Alkyl chain effects in thin films of substituted phthalocyanines studied using infrared spectroscopy
No full textThin films (2-50 nm) of unsubstituted and 1,4-octa-alkyl substituted zinc phthalocyanines were investigated using attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy, whereas the alkyl chains are C4H7, C7H13, C10H19. The absorption bands in the whole spectral range are discussed. We observe distinct differences in the spectra between the alkyl substituted Phthalocyanine (Pc) compounds. In contrast to PcZn and (but)(8)PcZn, the spectra of (hep)(8)PcZn and (dec)(8)PcZn show two additional features in the spectral range between 3700 and 3000 cm(-1), which are discussed in detail. (c) 2005 Elsevier B.V. All rights reserved
A Real-time testbed environment for Cyber-Physical Security on the power grid
No full textThe trustworthiness and security of cyber-physical systems (CPSs), such as the power grid, are of paramount importance to ensure their safe operation, performance, and economic efficiency. The aim of many cyber-physical security techniques, such as network intrusion detection systems (NIDSs) for CPSs, is to ensure continuous reliable operation even in exposed network environments. But the validation of such methods goes well beyond standard network analysis, since meaningful tests must also integrate realistic understanding of the physical systems behavior and response to the network activity. Our goal in this paper is to showcase an example of a testbed environment that can support such validation. In it, real network traffic, emulating and industrial control network, interacts with simulated physical models in real-time, extending and leveraging "hardware-in-the-loop" and "cyber-in-the-loop" capabilities. The testbed is a bridge between theory and practice and offers a number of features, including network communications, data management, as well as the virtualization of cyber-physical state analytics performed by the NIDS. The traffic is captured by real network taps and is forwarded to a real data management environment, receiving also the data reports from the simulated industrial control environment. To illustrate the capabilities of our testbed we show how the data are cross-checked by a "physics aware" NIDS, identifying network traffic that does not comply with its cyber-physical security rules
The Nation as a Civilizing Form: Contribution to the Figuration of the Polish Nation
No full textThis article was inspired by the book Studien über die Deutschen [Studies on the Germans] in which Norbert Elias encourages his readers to make sociological descriptions of the habitus of other nations. It is not only a matter of once again relearning lessons from history, but to look at them from the sociological perspective of figuration theory. The author’s aim is to make an initial outline of the research perspective that would combine the macro-sociological changes of Polish society with experience at the micro-sociological level (Łuczewski) or even the biographies of individuals (Bończa-Tomaszewski). For example, the influence of the partitions on Poles’ mentality is part of common knowledge, but it has not been (perhaps precisely for this reason) addressed sociologically. These considerations inevitably lead the author to ask what, in essence, is a nation and what national consciousness is. In conclusion, the author proposes hypothetical main motifs for describing the Polish habitus
Naród jako forma ucywilizowania. Przyczynek do figuracji narodu polskiego
No full textThis article was inspired by the book Studien über die Deutschen [Studies on the Germans] in which Norbert Elias encourages his readers to make sociological descriptions of the habitus of other nations. It is not only a matter of once again relearning lessons from history, but to look at them from the sociological perspective of figuration theory. The author’s aim is to make an initial outline of the research perspective that would combine the macro-sociological changes of Polish society with experience at the micro-sociological level (Łuczewski) or even the biographies of individuals (Bończa-Tomaszewski). For example, the influence of the partitions on Poles’ mentality is part of common knowledge, but it has not been (perhaps precisely for this reason) addressed sociologically. These considerations inevitably lead the author to ask what, in essence, is a nation and what national consciousness is. In conclusion, the author proposes hypothetical main motifs for describing the Polish habitus
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Control System Security from the Front Lines
No full textAs part of this special issue on control systems for the energy sector, guest editors Sean Peisert and Jonathan Margulies put together a roundtable discussion so readers can learn about the security challenges facing the industrial control system/SCADA world from those who are on the front lines. The discussion touches on some of the hard problems of securing mission-critical systems in the real world, including the challenges of securing 20-year-old legacy infrastructures, defining vendors' roles and responsibilities in security, and where research and new technologies are needed to fill today's security gaps
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