L7a.sp11 - Multi-Valued Byzantine Agreement Nitin Vaidya...

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1 Multi-Valued Byzantine Agreement Nitin Vaidya Electrical and Computer Engineering University of Illinois at Urbana-Champaign Joint work with Guanfeng Liang
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Client-Server Model 2 S1 C1
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Replicated Servers Replication for reliability All replicas handle each request to maintain replica consistency 3 S1 S3 S2 S4 C1
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Failure Model Crash failure - fail by stopping (“do no harm”) Byzantine failure – arbitrary, potentially harmful, behavior 4
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Failure Model Crash failure - fail by stopping (“do no harm”) Byzantine failure – arbitrary, potentially harmful, behavior 5
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Requirement All replicas must handle same requests despite failure 6 S1 S3 S2 S4 C1 R1 R2 R1, R2
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Requirement Replicas must handle requests in identical order despite failure 7 S1 S3 S2 S4 C1 C2 R1 R3 R2 R1, R2 R3
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Potential Solution One replica acts as leader Transmits requests to others 8 8 S1 S3 S2 S4 C1 C2 R1, R2 R3 R1, R3, R2
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What if S1 suffers Byzantine failure ? S1
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This note was uploaded on 02/08/2012 for the course ECE 428 taught by Professor Hu during the Spring '08 term at University of Illinois, Urbana Champaign.

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L7a.sp11 - Multi-Valued Byzantine Agreement Nitin Vaidya...

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