Conference key distribution schemes for portable communication systems

In the future, the portable communication system will be more and more popu lar. In this paper, we propose a new scheme that, with the help of this con venient system, can be used to hold conferences with only one common confer ence key while maintaining a high security level. Our new scheme can solve the problems of the low computation power of portable telephones and the he avy traffic between several participators. Our scheme does not only reduce the computation cost of portable telephones, but also alleviate communicati on traffic cost. Certainly. our scheme achieves two basic requirements: pri vacy and authentication. (C) 1999 Elsevier Science B.V. All rights reserved .