A method for sending confidential messages to a group without trusted parties

Authors:
Ren-Junn Hwang;Chin-Chen Chang
Affiliations:
Department of Computer Science and Information Engineering, Tamkang University, Taipei Hsien, Taiwan, R.O.C.;Institute of Computer Science and Information Engineering, National Chung Cheng University, Chiayi, Taiwan, R.O.C.
Venue:
ISPA'03 Proceedings of the 2003 international conference on Parallel and distributed processing and applications
Year:
2003

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Abstract

A simple and efficient method to send confidential messages to a group is proposed in this paper. Firstly, we show a practical and efficient generalized secret sharing scheme based on simple operations. Next, we propose a special design concept to construct a generalized group-oriented cryptosystem (GGOC) [5]. Any group can use our design concept to construct a GGOC which provides a secure environment for a sender to send confidential messages to it. The constructed GGOC does not need the assistance of any trusted party. We also apply our design concept to construct a GGOC based on RSA, DES, and our generalized secret sharing scheme. As a result, our new GGOC is simple and easy to implement in hardware. We also show that our proposed GGOC is practical and is more efficient than Chang and Lee's GGOC.