中文摘要：

为了有效克服当前密钥系统中的单一失效点，提出一种新的会议密钥分发方案．在具有容错性和前向安全性的基础上，一方面该方案是由会议主席和会议参加者共同产生密钥份额，而不是会议参加者或会议主席单独产生；另一方面该方案中任一会议参加者至少联合t-1个合法会议参加者并通过多项式插值才能恢复会议密钥．该方案相比于传统方案，大大提高了会议密钥的安全性和可靠性．

英文摘要：

In order to solve the problem of single point failure when distributing conference key, this paper design a new conference-key distribution scheme. The scheme can provide fault tolerance and forward security. On one hand it considers the secret shadows which should be generated by the conference president and members cooperatively. On the other hand, more than t members should cooperate to recover the conference key by polynomial interpolation. Hence, compared with the traditional conference-key schemes, the proposed scheme greatly enhances the security and reliability.