A Traitor Traceable Conference System with Dynamic Sender(Special Section on Cryptography and Information Security)

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概要

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• This paper addresses the problem of designing an unconditionally secure conference system that fulfills the requirements of both traceability and dynamic sender. In a socalled conference system, a common key is shared among all authorized users, and messages are encrypted using the shared key. It is known that a straightforward implementation of such a system may present a number of security weaknesses. Our particular concern lies in the possibility that unauthorized users may be able to acquire the shared key by illegal means, say from one or more authorized but dishonest users(called traitors). An unauthorized user who has successfully obtained the shared key can now decrypt scrambled messages without leaving any evidence on who the traitors were. To solve this problem, in this paper we propose a conference system that admits dynamic sender traceability. The new solution can detect traitors, even if the sender of a message is dynamically determined after a shared key is distributed to authorized users. We also prove that this scheme is unconditionally secure.

• 社団法人電子情報通信学会の論文
• 2002-01-01

著者

• Zheng Y

  Univ. North Carolina Charlotte Nc Usa

• Zheng Yuliang

  Department Of Software And Information Systems

• Hanaoka Goichiro

  3rd Department Institute Of Industrial Science The University Of Tokyo

• Shikata Junji

  Graduate School Of Environment And Information Sciences Yokohama National University

• Imai H

  Research Center For Information Security (rcis) National Institute Of Advanced Industrial Science An

• Imai Hideki

  3rd Department Institute Of Industrial Science The University Of Tokyo

• Shikata J

  The Graduate School Of Environment And Information Sciences Yokohama National University

• Hanaoka G

  National Institute Of Advanced Industrial Science And Technology

• HANAOKA Goichiro

  the 3rd Department, Institute of Industrial Science, The University of Tokyo

• SHIKATA Junji

  the 3rd Department, Institute of Industrial Science, The University of Tokyo

• ZHENG Yuliang

  the Department of Software and Information Systems, University of North Carolina

• IMAI Hideki

  the 3rd Department, Institute of Industrial Science, The University of Tokyo

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