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Byzantine Fault Tolerance Explained
Last Updated: January 5, 2026
Ashish Pratap Singh
11 min read
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Byzantine Fault Tolerance Explained
1. What is Byzantine Fault Tolerance?
2. The Byzantine Generals Problem
The Scenario
The Challenge
Why "Byzantine"?
3. Crash Faults vs Byzantine Faults
Crash Faults (Fail-Stop)
Byzantine Faults (Arbitrary Failures)
Fault Tolerance Requirements
4. The Critical One-Third Rule
Why One-Third?
Quorum Requirements
The Impossibility Result
5. How Practical BFT (PBFT) Works
Overview
System Architecture
The Three-Phase Protocol
View Change Protocol
Why Three Phases?
6. Beyond PBFT: Modern BFT Algorithms
HotStuff (2019)
Tendermint
Comparison of BFT Algorithms
7. Real-World Applications
Blockchain Networks
Aircraft Flight Control Systems
Distributed Databases
Financial Systems
8. Challenges and Trade-offs
Performance Overhead
Scalability Limitations
The CAP Theorem Trade-off
Trust Assumptions
When to Use BFT
9. Summary
References
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Course Introduction
