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Mechanical Verification Of A Schematic Protocol For Byzantine Fault Tolerant Clock Synchronization
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Book Synopsis Mechanical Verification of a Schematic Protocol for Byzantine Fault-tolerant Clock Synchronization by : Natarajan Shankar
Download or read book Mechanical Verification of a Schematic Protocol for Byzantine Fault-tolerant Clock Synchronization written by Natarajan Shankar and published by . This book was released on 1991 with total page 93 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: "Schneider [8] generalizes a number of protocols for Byzantine fault tolerant clock synchronization and presents a uniform proof for their correctness. We present a machine checked proof of this schematic protocol that revises some of the details in Schneider's original analysis. The verification was carried out with the EHDM system [7] developed at the SRI Computer Science Laboratory. The mechanically checked proofs include the verification that the egocentric mean function used in Lamport and Melliar-Smith's Interactive Convergence Algorithm [4] satisfies the requirements of Schneider's protocol."
Book Synopsis Mechanical Verification of a Schematic Byzantine Clock Synchronization Algorithm by : Natarajan Shankar
Download or read book Mechanical Verification of a Schematic Byzantine Clock Synchronization Algorithm written by Natarajan Shankar and published by . This book was released on 1991 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722914974 Total Pages :104 pages Book Rating :4.9/5 (149 download)
Book Synopsis A Verified Design of a Fault-Tolerant Clock Synchronization Circuit by : National Aeronautics and Space Administration (NASA)
Download or read book A Verified Design of a Fault-Tolerant Clock Synchronization Circuit written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-17 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: Schneider demonstrates that many fault tolerant clock synchronization algorithms can be represented as refinements of a single proven correct paradigm. Shankar provides mechanical proof that Schneider's schema achieves Byzantine fault tolerant clock synchronization provided that 11 constraints are satisfied. Some of the constraints are assumptions about physical properties of the system and cannot be established formally. Proofs are given that the fault tolerant midpoint convergence function satisfies three of the constraints. A hardware design is presented, implementing the fault tolerant midpoint function, which is shown to satisfy the remaining constraints. The synchronization circuit will recover completely from transient faults provided the maximum fault assumption is not violated. The initialization protocol for the circuit also provides a recovery mechanism from total system failure caused by correlated transient faults. Miner, Paul S. Langley Research Center ALGORITHMS; CIRCUITS; CLOCKS; FAULT TOLERANCE; SYNCHRONISM; CONVERGENCE; PROTOCOL (COMPUTERS); PROVING; SYSTEM FAILURES...
Book Synopsis Model Checking a Byzantine-Fault-Tolerant Self-Stabilizing Protocol for Distributed Clock Synchronization Systems by : Mahyar R. Malekpour
Download or read book Model Checking a Byzantine-Fault-Tolerant Self-Stabilizing Protocol for Distributed Clock Synchronization Systems written by Mahyar R. Malekpour and published by BiblioGov. This book was released on 2013-08 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents the mechanical verification of a simplified model of a rapid Byzantine-fault-tolerant self-stabilizing protocol for distributed clock synchronization systems. This protocol does not rely on any assumptions about the initial state of the system. This protocol tolerates bursts of transient failures, and deterministically converges within a time bound that is a linear function of the self-stabilization period. A simplified model of the protocol is verified using the Symbolic Model Verifier (SMV) [SMV]. The system under study consists of 4 nodes, where at most one of the nodes is assumed to be Byzantine faulty. The model checking effort is focused on verifying correctness of the simplified model of the protocol in the presence of a permanent Byzantine fault as well as confirmation of claims of determinism and linear convergence with respect to the self-stabilization period. Although model checking results of the simplified model of the protocol confirm the theoretical predictions, these results do not necessarily confirm that the protocol solves the general case of this problem. Modeling challenges of the protocol and the system are addressed. A number of abstractions are utilized in order to reduce the state space. Also, additional innovative state space reduction techniques are introduced that can be used in future verification efforts applied to this and other protocols.
Book Synopsis An Extension to Schneider's General Paradigm for Fault-tolerant Clock Synchronization by : Paul S. Miner
Download or read book An Extension to Schneider's General Paradigm for Fault-tolerant Clock Synchronization written by Paul S. Miner and published by . This book was released on 1992 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Byzantine-Fault Tolerant Self-Stabilizing Protocol for Distributed Clock Synchronization Systems by : National Aeronaut Administration (Nasa)
Download or read book A Byzantine-Fault Tolerant Self-Stabilizing Protocol for Distributed Clock Synchronization Systems written by National Aeronaut Administration (Nasa) and published by . This book was released on 2020-08-05 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: Embedded distributed systems have become an integral part of safety-critical computing applications, necessitating system designs that incorporate fault tolerant clock synchronization in order to achieve ultra-reliable assurance levels. Many efficient clock synchronization protocols do not, however, address Byzantine failures, and most protocols that do tolerate Byzantine failures do not self-stabilize. Of the Byzantine self-stabilizing clock synchronization algorithms that exist in the literature, they are based on either unjustifiably strong assumptions about initial synchrony of the nodes or on the existence of a common pulse at the nodes. The Byzantine self-stabilizing clock synchronization protocol presented here does not rely on any assumptions about the initial state of the clocks. Furthermore, there is neither a central clock nor an externally generated pulse system. The proposed protocol converges deterministically, is scalable, and self-stabilizes in a short amount of time. The convergence time is linear with respect to the self-stabilization period. Proofs of the correctness of the protocol as well as the results of formal verification efforts are reported. Malekpour, Mahyar R. Langley Research Center NASA/TM-2006-214322, L-19262 WBS 457280.02.07.07 CLOCKS; SYNCHRONISM; PROVING; FAULT TOLERANCE; CONVERGENCE; EMBEDDING; ALGORITHMS; SAFETY; PROTOCOL (COMPUTERS); PROGRAM VERIFICATION (COMPUTERS); FAILURE
Book Synopsis A Formally Verified Algorithm for Clock Synchronization Under a Hybrid Fault Model by :
Download or read book A Formally Verified Algorithm for Clock Synchronization Under a Hybrid Fault Model written by and published by . This book was released on 1996 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Verification of Fault-tolerant Clock Synchronization Systems by : Paul S. Miner
Download or read book Verification of Fault-tolerant Clock Synchronization Systems written by Paul S. Miner and published by . This book was released on 1993 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1991 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Formal Techniques in Real-Time and Fault-Tolerant Systems by : Jan Vytopil
Download or read book Formal Techniques in Real-Time and Fault-Tolerant Systems written by Jan Vytopil and published by Springer Science & Business Media. This book was released on 1991-12-11 with total page 636 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents state-of-the-art research results in the area of formal methods for real-time and fault-tolerant systems. The papers consider problems and solutions in safety-critical system design and examine how wellthe use of formal techniques for design, analysis and verification serves in relating theory to practical realities. The book contains papers on real-time and fault-tolerance issues. Formal logic, process algebra, and action/event models are applied: - to specify and model qualitative and quantitative real-time and fault-tolerant behavior, - to analyze timeliness requirements and consequences of faulthypotheses, - to verify protocols and program code, - to formulate formal frameworks for development of real-time and fault-tolerant systems, - to formulate semantics of languages. The integration and cross-fertilization of real-time and fault-tolerance issues have brought newinsights in recent years, and these are presented in this book.
Book Synopsis A Verified Design of a Fault-tolerant Clock Synchronization Circuit: Preliminary Investigations by :
Download or read book A Verified Design of a Fault-tolerant Clock Synchronization Circuit: Preliminary Investigations written by and published by . This book was released on 1992 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Second NASA Formal Methods Workshop 1992 by :
Download or read book The Second NASA Formal Methods Workshop 1992 written by and published by . This book was released on 1992 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dependable Computing for Critical Applications 3 by : Carl E. Landwehr
Download or read book Dependable Computing for Critical Applications 3 written by Carl E. Landwehr and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains the papers presented. at the Third IFIP International Working Conference on Dependable Computing for Critical Applications, sponsored by IFIP Working Group 10.4 and held in Mondello (Sicily), Italy on September 14-16, 1992. System developers increasingly apply computers where they can affect the safety and security of people and equipment. The Third IFIP International Working Conference on Dependable Computing for Critical Applications, like its predecessors, addressed various aspects of computer system dependability, a broad term defined as the degree of trust that may justifiably be placed in a system's reliability, availability, safety, security, and performance. Because the scope of the conference was so broad, we hope the presentations and discussions will contribute to the integration of these concepts so that future computer-based systems will indeed be more dependable. The Program Committee selected 18 papers for presentation from a total of 7 4 submissions at a May meeting in Newcastle upon Tyne, UK. The resulting program represented a broad spectrum of interests, with papers from universities, corporations, and government agencies in eight countries. Much diligent work by the Program Committee and the quality of reviews from more than a hundred external referees from around the world, for which we are most grateful, significantly eased the production of this technical program.
Book Synopsis A Byzantine-Fault Tolerant Self-Stabilizing Protocol for Distributed Clock Synchronization Systems by : Nasa Technical Reports Server (Ntrs)
Download or read book A Byzantine-Fault Tolerant Self-Stabilizing Protocol for Distributed Clock Synchronization Systems written by Nasa Technical Reports Server (Ntrs) and published by BiblioGov. This book was released on 2013-07 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: Embedded distributed systems have become an integral part of safety-critical computing applications, necessitating system designs that incorporate fault tolerant clock synchronization in order to achieve ultra-reliable assurance levels. Many efficient clock synchronization protocols do not, however, address Byzantine failures, and most protocols that do tolerate Byzantine failures do not self-stabilize. Of the Byzantine self-stabilizing clock synchronization algorithms that exist in the literature, they are based on either unjustifiably strong assumptions about initial synchrony of the nodes or on the existence of a common pulse at the nodes. The Byzantine self-stabilizing clock synchronization protocol presented here does not rely on any assumptions about the initial state of the clocks. Furthermore, there is neither a central clock nor an externally generated pulse system. The proposed protocol converges deterministically, is scalable, and self-stabilizes in a short amount of time. The convergence time is linear with respect to the self-stabilization period. Proofs of the correctness of the protocol as well as the results of formal verification efforts are reported.
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722183882 Total Pages :58 pages Book Rating :4.1/5 (838 download)
Book Synopsis An Extension to Schneider's General Paradigm for Fault-Tolerant Clock Synchronization by : National Aeronautics and Space Administration (NASA)
Download or read book An Extension to Schneider's General Paradigm for Fault-Tolerant Clock Synchronization written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-02 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 1987, Schneider presented a general paradigm that provides a single proof of a number of fault tolerant clock synchronization algorithms. His proof was subsequently subjected to the rigor of mechanical verification by Shankar. However, both Schneider and Shankar assumed a condition Shankar refers to as a bounded delay. This condition states that the elapsed time between synchronization events (i.e., the time that the local process applies an adjustment to its logical clock) is bounded. This property is really a result of the algorithm and should not be assumed in a proof of correctness. This paper remedies this by providing a proof of this property in the context of the general paradigm proposed by Schneider. The argument given is a generalization of Welch and Lynch's proof of a related property for their algorithm. Miner, Paul S. Langley Research Center...
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781724221483 Total Pages :226 pages Book Rating :4.2/5 (214 download)
Book Synopsis Formal Verification of a Fault Tolerant Clock Synchronization Algorithm by : National Aeronautics and Space Administration (NASA)
Download or read book Formal Verification of a Fault Tolerant Clock Synchronization Algorithm written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-24 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt: A formal specification and mechanically assisted verification of the interactive convergence clock synchronization algorithm of Lamport and Melliar-Smith is described. Several technical flaws in the analysis given by Lamport and Melliar-Smith were discovered, even though their presentation is unusally precise and detailed. It seems that these flaws were not detected by informal peer scrutiny. The flaws are discussed and a revised presentation of the analysis is given that not only corrects the flaws but is also more precise and easier to follow. Some of the corrections to the flaws require slight modifications to the original assumptions underlying the algorithm and to the constraints on its parameters, and thus change the external specifications of the algorithm. The formal analysis of the interactive convergence clock synchronization algorithm was performed using the Enhanced Hierarchical Development Methodology (EHDM) formal specification and verification environment. This application of EHDM provides a demonstration of some of the capabilities of the system. Rushby, John and Vonhenke, Frieder Unspecified Center NASA-CR-4239, NAS 1.26:4239 NAS1-17067; RTOP 505-66-21-01...
Download or read book COMPASS written by and published by . This book was released on 1995 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:
