Tree-based group key agreement

  • Authors:
  • Yongdae Kim;Adrian Perrig;Gene Tsudik

  • Affiliations:
  • University of Minnesota, Twin Cities, MN;Carnegie Mellon University, Pittsburgh, PA;University of California, Irvine, CA

  • Venue:
  • ACM Transactions on Information and System Security (TISSEC)
  • Year:
  • 2004

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Abstract

Secure and reliable group communication is an active area of research. Its popularity is fueled by the growing importance of group-oriented and collaborative applications. The central research challenge is secure and efficient group key management. While centralized methods are often appropriate for key distribution in large multicast-style groups, many collaborative group settings require distributed key agreement techniques. This work investigates a novel group key agreement approach which blends key trees with Diffie--Hellman key exchange. It yields a secure protocol suite called Tree-based Group Diffie--Hellman (TGDH) that is both simple and fault-tolerant. Moreover, the efficiency of TGDH appreciably surpasses that of prior art.