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中文摘要：
为便于进行委托交易，如在线代理活动或由授权代理签署的商业合同，提出一个基于双线性对的安全有效的代理签名方案。方案允许原始签名者把签名权委托给一个代理签名者，使得后者能够代表他给文件签名，且产生的代理签名能够被任何人验证。方案经验证正确，且满足不可伪造性、不可否认性等安全性要求。另外，代理签名者只能在规定的职权范围内行事，有效地防止了代理权滥用。与其它代理签名方案相比，该方案具有较高的计算效率，尤其在代理委托阶段不涉及运算量大的双线性对运算，这极有利于实际应用。
英文摘要：
For facilitating the confidential transaction with delegation , such as on-line proxy auction and business contract signing by an authorized proxy , we propose an efficient proxy signature scheme from pairings.The scheme allows an original signer to delegate his signing power to a proxy one so that the latter can sign a plaintext on behalf of the former and the proxy signature can be verified by any other people .The scheme has been proved correct and satisfies the security requirement of unforgeability and non -repudiation . Moreover , the proxy signer can only do what has been authorized , which can prevent the abuse of agency . Compared with other proxy signature schemes , this scheme has better computational efficiency , especially the delegation process involves no bilinear pairing computation regarded as the most time-consuming operation , which is conducive to practical application .
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