Abstract: Identity-based cryposystems can simplify key management in cryptosystems.A conference key distribution system is been proposed in the paper based on elliptic curve .It can generate one common secret communication key for each link in the network. Only public informations have been used in the whole process. The new scheme can detect both the uni-directional attack and the bi-directional attrack.

Key words: conference key, the problem of factoring large numbers, the problem of computing elliptic curve discrete logarithms, the Williams scheme

摘要： 提出了一种基于身份的的会议密钥分配方案。在该方案中，会议密钥是以广播方式发送的，任何人不能冒充会议主席来分发会议密钥；这一过程只利用了公开信息.。该方案不仅能抵抗单方攻击，而且也能抵抗双方联合攻击.而且所需计算量比原来的一些方案小。

关键词: 会议密钥, 大数因子分解问题, 椭圆曲线离散对数问题, Williams体制