中央研究院  |  資訊科學研究所  |  多媒體網路與系統實驗室
A Distributed Key Assignment Protocol for Secure Multicast based on Proxy Cryptography
(NOTE: Sheng-Wei Chen is also known as Kuan-Ta Chen.)

Abstract
A secure multicast framework should only allow authorized members of a group to decrypt received messages; usually one "group key" is shared by all approved members. However, this raises the problem of "one affects all," whereby the actions of one member aRect the whole group. Many researchers solve the problem by dividing a group into several subgroups, but most existing solutions require a centralized trusted controller to coordinate cryptographic keys for subgroups. We believe this is a constraint on network scalability.<p> In this paper, <b><i>we propose a novel framework to solve key management problems in multicast networks</i></b>. Our contribution is three-fold: 1) We exploit the ElGamal cryptosystem and propose the idea of key composition; 2) A distributed key assignment protocol is proposed to eliminate the need for a centralized trust controller in a secure multicast network that leverages proxy cryptography; and 3) We adopt a hybrid encryption technique that makes our framework more efficient and practical. Comparison with similar frameworks shows the proposed scheme is efficient in both time and space complexity. In addition, costs of most protocol operations are bounded by constants regardless of a group's size and the degree of transit nodes.

Materials
Citation
Chun-Ying Huang, Yun-Peng Chiu, Kuan-Ta Chen and Chin-Laung Lei, "A Distributed Key Assignment Protocol for Secure Multicast based on Proxy Cryptography," In Proceedings of the 2006 ACM Symposium on Information, computer and communications security, 2006.

BibTex
@INPROCEEDINGS{huang06:key,
  TITLE      = {{A Distributed Key Assignment Protocol for Secure Multicast based on Proxy Cryptography}},
  AUTHOR     = {Chun-Ying Huang and Yun-Peng Chiu and Kuan-Ta Chen and Chin-Laung Lei},
  BOOKTITLE  = {Proceedings of the 2006 ACM Symposium on Information, computer and communications security},
  PAGES      = {359--359},
  YEAR       = {2006}
}