A Method for Sending Confidential Messages to a Group without Trusted Parties

摘要

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). 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.