MULTICAST SECURITY GROUP KEY MANAGEMENT PROTOCOL

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MULTICAST SECURITYGROUP KEY MANAGEMENT PROTOCOL

• COURSE CMSC 621

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INTRODUCTION TO MULTICAST COMMUNICATIONS

• Multicast takes place at the network layer
• It is used to distribute data to a group of
  members
• Membership is dynamic
• Advantages over broadcast and unicast
• Over wireless it is more useful to use multicast
  as the information is sent only to desired
  recipients
• Disadvantage is that the data transfer is
  unreliable because of security issues

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WHY SECURITY IS NEEDED?

• Dynamic entry and exit of members
• Authentication of the group members 2
• Integrity during transmission 2
• Confidentiality services for a multicast
  session2

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KEYS IN MULTICAST

• Keys are used for encryption and decryption
  purpose
• Use of keys for secure multicast session
• Various protocols to create and manage keys in
  multicast
• Group Key Management Protocol for grouped
  symmetric keys

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GKMP

• Experimental protocol for internet community
• Create grouped symmetric keys
• Distribute them amongst communicating peers
• No central key distribution site needed
• Only group members have the key
• Sender or receiver oriented operation
• Can make use of multicast communications
  protocols

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GKMP FEATURES

• Multicast It is used with multicast and is an
  advancement over centralized key management
• Security It limits exposure of the key by
  providing high security
• Reliability Group responsible for key during
  system failure
• Operating expense Additional security mechanisms
  are not required as compared to centralized key
  distribution
• Communication resources As all the tasks are
  distributed no bottleneck in accessing resources.
• Latency Time to process requests is better as
  compared to centralized key distribution
• Extendibility Addition of more members does not
  create a bottleneck

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PROJECT GOALS

• Network security in multicast wireless networks
• GKMP Architecture
• GKMP Specification

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REFERENCE

• 1Unicast vs. Multicast over Wireless A Cross
  Disciplinary Mindshare for Educational
  Application Researchers Patrick Bristow
• 2Techniques and Issues in Multicast Security
  Peter S. Kruus, Joseph P. Macker. Naval Research
  Laboratory
• 3RFC 2094 Group Key Management Protocol (GKMP)
  Architecture H. Harney, C. Muckenhirn. SPARTA,
  Inc. July 1997
• 4RFC 2094 Group Key Management Protocol (GKMP)
  Specification H. Harney, C. Muckenhirn. SPARTA,
  Inc. July 1997

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REFERENCE

• 5Group keys and Multicast Security in Ad Hoc
  Networks Tzu-Chiang Chiang and Yueh-Min Huang.
  Department of Engineering Science, National
  Cheng-Kung University, Tainan, Taiwan.
• 6Source Routing for Overlay Multicast in
  Wireless Ad hoc and Sensor Networks Chi-Kuo
  Chiang and Chung-Ta King, Department of Computer
  Science, National Tsing Hua University.
• 7Multicast in Wireless Sensor Networks The next
  step J. Sa Silva, T. Camilo, A.Rodrigues,
  M.Silva, F. Gaudencio and F. Boavida. Department
  de Engenharia Informatica, Universidade de Coimbra