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Vulnerabilities of Reliable Multicast Protocols

Vulnerabilities of Reliable Multicast Protocols. Thomas M. Park, David A. Kassay, Clifford J. Weinstein Massachusetts Institute of Technology Lincoln Laboratory Lexinton, Massachusetts Reviewed by: Siu Fung (Andes) Chin. Vulnerabilities of Reliable Multicast Protocols. Outline Introduction

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Vulnerabilities of Reliable Multicast Protocols

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  1. Vulnerabilities of Reliable Multicast Protocols Thomas M. Park, David A. Kassay, Clifford J. Weinstein Massachusetts Institute of Technology Lincoln Laboratory Lexinton, Massachusetts Reviewed by: Siu Fung (Andes) Chin

  2. Vulnerabilities of Reliable Multicast Protocols • Outline • Introduction • Types of Protocols • Attacks • Defenses • Conclusion

  3. Multiple unicast transmission TCP/IP Multicast transmission RMP SRM Introduction

  4. Introduction (cond.) • Why reliable multicast transmission? • More efficient • Problems? • Lack of security • Solutions? • Network-level security (IPSEC) • Secret-key algorithm • Risk management approach

  5. Types of reliable multicast protocols • Sender-initiated reliability protocol • Positive acknowledgment (ACK) • ACK implosion • Example: RMP(Reliable Multicast Protocol) • Token around ring

  6. Types of reliable multicast protocols (cont) • Receiver-initiated reliability protocol • Negative acknowledgment (NCK) • NCK implosion • Example: SRM(Scalable Reliable Multicast Protocol) • Suppress excess NAK

  7. Vulnerabilities • Flooding attack • Consume network bandwidth/process time • Forged data attack • Corruption of files transmitted (RMP) • Premature ACK • Assign incorrect sequence no. (RMP) • NAK and retransmission suppression • Interfare retransmissions (SRM)

  8. Defense • Fliter received packets • Block attacker’s packet • Digitally signed messages • Identify legitimate members • Employ IGMP v3 (Internet Group Management Protocol) • Prevent flooding • Simple authentication protocol • Prevent spoofing

  9. Conclusion • Different types reliable multicast protocol • Different types attack • Different types defense • Increase protection – increase cost • Questions?

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