Most proxy re-signature schemes require expensive bi-linear pairing operations, which are not suitable for low-power devices. To improve the performance of signature verification algorithm, a bidirectional sever-aided verification proxy re-signature is proposed. This scheme can effectively resist collusion attacks and adaptive chosen message attacks. Analysis results show that the proposed scheme reduces computation cost of pairing operation, and it greatly reduces speeds up signature verification. The proposed scheme is more efficient than the existing proxy re-signature schemes.%大多数代理重签名方案需要复杂的双线性对运算，无法适用于计算能力较弱的低端计算设备。为了提高签名验证算法的计算性能，提出了一个可证明安全的双向服务器辅助验证代理重签名方案，能有效抵抗合谋攻击和选择消息攻击。分析结果表明，新方案减少了复杂的双线性对运算，提高了签名验证速度，在效率上优于同类代理重签名方案。
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