A distributed fault-tolerant conference key distribution and restitution scheme based on mechanism of identity-based cryptography and （t,n）threshold secret sharing is proposed in this paper. The new scheme is.much different to traditional scheme, its secret shadows are not brought from the sponsor of conference, but from each server＇s private key signature. By getting together these n secret shadows, the sponsor can construct polynomial. Any of conferees invited by the sponsor can request these secret shadows from t of these n servers, and t...
